Moisture, pH, conductivity, temperature and N-P-K screens — what each earns its keep for, and the hard limits Australian advisers expect you to respect.
TerraProbe records seven indicators at a point. Three are measured directly: moisture, electrical conductivity and temperature. Four are screened from the conductivity reading — pH, nitrogen, phosphorus and potassium — so they rise and fall together as one signal about dissolved salts, not as four independent results. Used well, the set is greater than any single number. Used poorly, one screened indicator gets promoted into a fertiliser or lime prescription it cannot defend.
This Field Note is a plain-English tour of what each indicator is good for, where it stops, and how the seven work as a bundle. It is written for growers who want to understand portable soil screening without marketing fog. TerraTactics is a screening and record platform. Laboratory chemistry and agronomy advice remain the basis for rates, products and legal claims about fertiliser or liming need.
THE POINT OF A SET
A single soil reading is an anecdote. Seven indicators at the same point, on a known date, under noted conditions, become a miniature scene. Moisture tells you whether the scene was wet. Temperature tells you whether it was cold. Conductivity — the keystone — is the direct read on dissolved salts, and the reading the four screened indicators are calculated from. Agreement between screened pH, N, P and K is not corroboration; it is the same conductivity signal presented four ways. Together the set answers a better question than “is my nitrogen high?” — it answers “what is happening at this named point, and is it different from last season?”
That is the job. Not yield prediction. Not a replacement for a comprehensive soil test. Not a silent agronomist.
MOISTURE — THE COMPARABILITY GATE
Moisture is useful as a management clue and essential as a comparability gate. It helps you judge infiltration and cover effects over time at the same point. More importantly, it tells you whether two chemistry screens are allowed to argue with each other.
If moisture is wildly different between visits, treat conductivity and its derived screens with suspicion. If moisture is matched and conductivity moves, you have a stronger reason to investigate. Record moisture every time. Prefer routine comparison passes in a similar moisture class. Details live in the companion Field Note on moisture, temperature and honest comparisons.
pH — A CONDUCTIVITY-BASED SCREEN, NOT A LIME ORDER
The probe has no pH electrode. Screened pH is calculated from the conductivity reading and reported across a limited range. Treat a shift as a flare — a reason to book a laboratory pH test — not as a pH figure to act on. Lime decisions need laboratory pH — typically in water and in calcium chloride — plus exchangeable aluminium and a sense of buffering and depth. Australian acidity guidance is explicit that field checks start the job and laboratory CaCl₂ chemistry underwrites it.
Watch for points that sit low relative to the paddock baseline, or that slide across seasons. Then escalate. Do not convert a screened pH into tonnes per hectare with a coffee-shop formula. Read the companion note on when screening pH should send you to the lab.
ELECTRICAL CONDUCTIVITY — SALTS, WATER, AND OTHER IONS
Conductivity responds to dissolved ions and to the water that carries them. It can flag salinity risk, irrigation effects, fertiliser bands and storm noise. Absolute portable numbers are not automatically the ECe values used in crop tolerance tables. Trends against a named-point baseline under matched moisture are the portable tool’s best trick.
Escalate when plants and trends agree, or when water sources change. Keep fertiliser timing in the notes so you do not mistake a band for a salt outbreak. The companion note on conductivity without fooling yourself goes deeper.
TEMPERATURE — QUIET BUT LOAD-BEARING
Temperature is context for everything else and a practical input to timing conversations you were already having — sowing, side-dressing, waiting out a cold snap. It also helps explain odd sensor behaviour and stops cold soils from being misread as fertility failures. Habitual sampling windows beat random times of day. Write temperature down even when it seems obvious.
NITROGEN, PHOSPHORUS, POTASSIUM — THE MOST COMMONLY OVER-READ
Here is the sentence that should stay on the shed wall: portable N-P-K values are indicative screens calculated from the same conductivity reading. They help you decide where to send a laboratory sample. They cannot support a fertiliser rate, and anyone telling you otherwise is selling something. Because they share one parent measurement, agreement between N, P and K is not three lines of evidence — it is one.
Why the hard line? Nutrient availability is chemical-method dependent. Laboratories specify extracts. Portable screens do not become those extracts by wishing. Spatial variability means one point is not a paddock average. Temporal variability means a screen after fertiliser or after water movement is a moment, not a budget. Regulatory and commercial agronomy advice needs defensible chemistry. Indicative screens are for triage.
Used ethically, nutrient screens still earn their keep:
• They highlight zones that disagree with neighbours under similar conditions
• They prompt better laboratory targeting when budgets are finite
• They present the conductivity signal in familiar terms while keeping its limits visible
• They support practical conversations about why laboratory testing still matters
Used unethically, they become a fake prescription pad. TerraTactics will not ask you to use them that way.
HOW TO READ A SEVEN-INDICATOR VISIT
Work in order:
1. Moisture and temperature — is this visit comparable to the ones I care about?
2. Conductivity — the measured keystone: is the ionic background noisy (salt, fertiliser, wetness)?
3. Screened pH, N, P and K — read as one conductivity-derived signal: any zone that deserves a lab?
4. Notes — cover, stock, water, recent inputs
Then look sideways at neighbouring points on the same day. Pattern across space is often clearer than obsession with one cell in a spreadsheet.
SEASONAL READING VERSUS SAMPLE READING
A sample answers what the soil was like in a small volume on one day. A season answers direction of travel. Is conductivity at this point drifting up over three autumns? Is the wet corner staying wetter longer since the rotation changed? Is the pH gap between the top and bottom of the paddock widening?
Those are questions worth taking to an agronomist because you arrive with evidence rather than a hunch. They are also questions you can only ask if you sampled the same points, the same way, for long enough. The second season of data is worth more than the first. The third is worth more than both.
COMMON MISREADS
• Treating nutrient screens as rates
• Ignoring moisture while debating conductivity
• Averaging unrelated points into a fake paddock figure
• Mixing depths in one series
• Cherry-picking the most alarming indicator and discarding the calming ones
• Comparing irrigated and dryland visits without labels
Each misread is avoidable with a one-page SOP and the discipline to follow it.
WHERE LABORATORY CHEMISTRY STILL WINS
Buy laboratory work when money will move: lime, gypsum, substantial fertiliser plans, salinity remediation, compliance, lease negotiations, and any argument that needs a defensible extract. Use portable screening to decide where and how often those tests happen, and to watch the paddock between them.
A healthy farm uses both. A confused farm uses whichever number is closest to the decision they already wanted to make.
HOW TERRATACTICS PRESENTS THE SET WITHOUT OVERCLAIMING
In the paddock, the probe captures the seven indicators over USB-C as a repeatable spot measurement. On the phone, the Android app stores readings offline, stamps GPS, and syncs when signal returns. At the desk, the Grower portal holds paddock boundaries, paddock notes, point notes, laboratory reports, history, charts and screening insights. Optional TerraTactics Soil Analysis on Grower plans organises what changed in plain language. You can walk the same philosophy on the public demonstration before you commit.
The product promise is a trustworthy field record and honest screening — not magical nutrients-from-a-spike.
TEACHING THE SET TO NEW STAFF
Give new samplers a laminated card:
• Points and depth first
• Wait for settle time
• Moisture and temperature are mandatory notes
• N-P-K are flags, not rates
• If surprised, resample once, then escalate — do not invent a theory in the ute
Shadow them for a round. Most dataset damage is human, not electronic.
EXPLAINING THE SET CLEARLY
The seven indicators are a clarity test. If an explanation sounds like laboratory replacement, pull it back. Repeatable screening, a GPS farm record and optional analysis match what careful farmers already believe about tools: useful, limited and worth having when the limits are spoken aloud.
MOISTURE IN MORE DEPTH — WHAT IT WILL AND WILL NOT DO
Moisture from a portable insertion reading describes the soil–water state at the depth and moment you measured. It supports comparisons between visits at the same point. It helps explain conductivity swings. It does not tell you total profile water storage, deep drainage, or whether the crop is transpiring at yield-limiting stress unless you already interpret it beside crop and weather knowledge.
On irrigation farms, pair shallow moisture with your knowledge of the last set. On dryland farms, pair it with the last effective rain and cover type. When moisture is stable across seasons and conductivity and its derived screens move, you have earned a laboratory conversation. When moisture moved and everything else moved with it, weather may have written the story.
pH IN MORE DEPTH — PAIRING WITH THE OTHER SIX
pH screens sit beside conductivity because saline patches can complicate acidity interpretation at the margin. They sit beside moisture because dry powder and saturated mud are poor moments for confidence. They sit beside temperature for the same seasonal honesty reasons as other electrochemical screens. None of that makes portable pH a laboratory CaCl₂ reading.
Australian liming culture has moved toward treating acidity as a layered profile problem. The seven-indicator visit tells you whether today’s shallow screen at Point 2 is worse than last autumn at the same moisture class. It does not map aluminium at 15 cm. Use the bundle to prioritise depth-separated laboratory work, not to skip it.
CONDUCTIVITY IN MORE DEPTH — CHOIR NOT SOLO
When conductivity, moisture and temperature rise together after a storm, defer panic. When conductivity rises on matched moisture and plants show salt-type stress, escalate. When conductivity and its derived screens rise after banding, note fertiliser timing before calling salinity.
In the portal, view conductivity trends only after checking the moisture recorded with each visit. Real paddock history is more useful than a perfectly clean demonstration series.
TEMPERATURE IN MORE DEPTH — TIMING DECISIONS YOU ALREADY MAKE
Soil temperature supports the same management calendar you already use: when to sow after the break, when to expect mineralisation flush, when cold soil makes side-dress risky. It does not replace Bureau forecasts or paddock walk observations. It anchors the screening record to a thermal moment so an agronomist can trust the visit.
NITROGEN — INDICATIVE TRIAGE ONLY
Portable nitrogen screens respond to moisture, temperature, recent fertiliser, legume history and organic matter in ways that do not translate to a urea rate. GRDC and state extension emphasise nitrogen decisions built on yield goal, protein target, soil test nitrate and ammonium in laboratory extracts, and seasonal outlook — not on a single field proxy.
Ethical use: a nitrogen screen that reads low relative to neighbouring points under similar moisture might justify a laboratory nitrate test before top-dress. Unethical use: multiplying a screen value into kilograms per hectare without method, depth and calibration behind it.
PHOSPHORUS — INDICATIVE TRIAGE ONLY
Phosphorus availability in Australian soils ties to pH, fixation on clays and ironstones, and Colwell or Bray-style laboratory extracts chosen for your soil type. Portable phosphorus screens cannot become Colwell by assertion. They can show that Point 5 consistently reads differently from Point 1 on the same day, which helps target composite or grid laboratory sampling before big capital spend on fertiliser.
In pasture country, phosphorus and acidity interact with legume performance. Use pH screens and pasture history alongside indicative phosphorus when deciding whether the next dollar is lime, phosphorus, or both in laboratory-informed planning.
POTASSIUM — INDICATIVE TRIAGE ONLY
Potassium matters in hay and silage systems where removal is high, and in some horticultural crops. Portable potassium screens suffer the same method and variability limits as other nutrient proxies. Use them to ask whether a laboratory potassium test is due, not to settle a muriate rate.
DRYLAND VERSUS IRRIGATED USE OF THE SET
Dryland growers often lean on pH and moisture comparability across autumns, using conductivity for discrete saline flats and storm follow-up. Irrigated growers lean on conductivity and moisture together when water source or reuse changes, always remembering ECe is laboratory language.
Both groups benefit from keeping nutrient screens in the triage lane. The spend decisions — lime, gypsum, leaching infrastructure, fertiliser blends — stay with laboratory chemistry and accredited advice.
WHAT HISTORY IN THE GROWER PORTAL ADDS
One visit is a photograph. Twenty visits at six named points are a film. The portal stores GPS-stamped readings from the Android app, syncs when connectivity returns, and lets you chart indicator drift. Optional TerraTactics Soil Analysis on Grower plans summarises change in plain language while still treating nutrient values as indicative.
Insights that flag conductivity or pH watches are prompts aligned with screening ethics: investigate, laboratory-confirm, do not prescribe from the flag alone.
INTEGRITY CHECKLIST BEFORE YOU SHARE DATA OUTSIDE THE FARM
Before sending portal exports to an agronomist, check depth consistency, moisture tags on outlier visits, and whether nutrient screens are labelled mentally as triage. When you show someone the portal for the first time, explain that N-P-K on screen are not the numbers on a fertiliser invoice. Integrity builds a useful record; overclaim builds short-term confusion.
BOTTOM LINE
Moisture, conductivity and temperature are measured. pH, nitrogen, phosphorus and potassium are screened from conductivity and must never be treated as independent results or as a basis for rates. The value of the set is not any single number. It is seven indicators at the same point, on a known date, that you can compare to the same seven next season — then take to an adviser without embarrassment.
Read the season, not the sample. Keep the method still. Let the paddock move. That is what the seven indicators are for.
This Field Note is a plain-English tour of what each indicator is good for, where it stops, and how the seven work as a bundle. It is written for growers who want to understand portable soil screening without marketing fog. TerraTactics is a screening and record platform. Laboratory chemistry and agronomy advice remain the basis for rates, products and legal claims about fertiliser or liming need.
THE POINT OF A SET
A single soil reading is an anecdote. Seven indicators at the same point, on a known date, under noted conditions, become a miniature scene. Moisture tells you whether the scene was wet. Temperature tells you whether it was cold. Conductivity — the keystone — is the direct read on dissolved salts, and the reading the four screened indicators are calculated from. Agreement between screened pH, N, P and K is not corroboration; it is the same conductivity signal presented four ways. Together the set answers a better question than “is my nitrogen high?” — it answers “what is happening at this named point, and is it different from last season?”
That is the job. Not yield prediction. Not a replacement for a comprehensive soil test. Not a silent agronomist.
MOISTURE — THE COMPARABILITY GATE
Moisture is useful as a management clue and essential as a comparability gate. It helps you judge infiltration and cover effects over time at the same point. More importantly, it tells you whether two chemistry screens are allowed to argue with each other.
If moisture is wildly different between visits, treat conductivity and its derived screens with suspicion. If moisture is matched and conductivity moves, you have a stronger reason to investigate. Record moisture every time. Prefer routine comparison passes in a similar moisture class. Details live in the companion Field Note on moisture, temperature and honest comparisons.
pH — A CONDUCTIVITY-BASED SCREEN, NOT A LIME ORDER
The probe has no pH electrode. Screened pH is calculated from the conductivity reading and reported across a limited range. Treat a shift as a flare — a reason to book a laboratory pH test — not as a pH figure to act on. Lime decisions need laboratory pH — typically in water and in calcium chloride — plus exchangeable aluminium and a sense of buffering and depth. Australian acidity guidance is explicit that field checks start the job and laboratory CaCl₂ chemistry underwrites it.
Watch for points that sit low relative to the paddock baseline, or that slide across seasons. Then escalate. Do not convert a screened pH into tonnes per hectare with a coffee-shop formula. Read the companion note on when screening pH should send you to the lab.
ELECTRICAL CONDUCTIVITY — SALTS, WATER, AND OTHER IONS
Conductivity responds to dissolved ions and to the water that carries them. It can flag salinity risk, irrigation effects, fertiliser bands and storm noise. Absolute portable numbers are not automatically the ECe values used in crop tolerance tables. Trends against a named-point baseline under matched moisture are the portable tool’s best trick.
Escalate when plants and trends agree, or when water sources change. Keep fertiliser timing in the notes so you do not mistake a band for a salt outbreak. The companion note on conductivity without fooling yourself goes deeper.
TEMPERATURE — QUIET BUT LOAD-BEARING
Temperature is context for everything else and a practical input to timing conversations you were already having — sowing, side-dressing, waiting out a cold snap. It also helps explain odd sensor behaviour and stops cold soils from being misread as fertility failures. Habitual sampling windows beat random times of day. Write temperature down even when it seems obvious.
NITROGEN, PHOSPHORUS, POTASSIUM — THE MOST COMMONLY OVER-READ
Here is the sentence that should stay on the shed wall: portable N-P-K values are indicative screens calculated from the same conductivity reading. They help you decide where to send a laboratory sample. They cannot support a fertiliser rate, and anyone telling you otherwise is selling something. Because they share one parent measurement, agreement between N, P and K is not three lines of evidence — it is one.
Why the hard line? Nutrient availability is chemical-method dependent. Laboratories specify extracts. Portable screens do not become those extracts by wishing. Spatial variability means one point is not a paddock average. Temporal variability means a screen after fertiliser or after water movement is a moment, not a budget. Regulatory and commercial agronomy advice needs defensible chemistry. Indicative screens are for triage.
Used ethically, nutrient screens still earn their keep:
• They highlight zones that disagree with neighbours under similar conditions
• They prompt better laboratory targeting when budgets are finite
• They present the conductivity signal in familiar terms while keeping its limits visible
• They support practical conversations about why laboratory testing still matters
Used unethically, they become a fake prescription pad. TerraTactics will not ask you to use them that way.
HOW TO READ A SEVEN-INDICATOR VISIT
Work in order:
1. Moisture and temperature — is this visit comparable to the ones I care about?
2. Conductivity — the measured keystone: is the ionic background noisy (salt, fertiliser, wetness)?
3. Screened pH, N, P and K — read as one conductivity-derived signal: any zone that deserves a lab?
4. Notes — cover, stock, water, recent inputs
Then look sideways at neighbouring points on the same day. Pattern across space is often clearer than obsession with one cell in a spreadsheet.
SEASONAL READING VERSUS SAMPLE READING
A sample answers what the soil was like in a small volume on one day. A season answers direction of travel. Is conductivity at this point drifting up over three autumns? Is the wet corner staying wetter longer since the rotation changed? Is the pH gap between the top and bottom of the paddock widening?
Those are questions worth taking to an agronomist because you arrive with evidence rather than a hunch. They are also questions you can only ask if you sampled the same points, the same way, for long enough. The second season of data is worth more than the first. The third is worth more than both.
COMMON MISREADS
• Treating nutrient screens as rates
• Ignoring moisture while debating conductivity
• Averaging unrelated points into a fake paddock figure
• Mixing depths in one series
• Cherry-picking the most alarming indicator and discarding the calming ones
• Comparing irrigated and dryland visits without labels
Each misread is avoidable with a one-page SOP and the discipline to follow it.
WHERE LABORATORY CHEMISTRY STILL WINS
Buy laboratory work when money will move: lime, gypsum, substantial fertiliser plans, salinity remediation, compliance, lease negotiations, and any argument that needs a defensible extract. Use portable screening to decide where and how often those tests happen, and to watch the paddock between them.
A healthy farm uses both. A confused farm uses whichever number is closest to the decision they already wanted to make.
HOW TERRATACTICS PRESENTS THE SET WITHOUT OVERCLAIMING
In the paddock, the probe captures the seven indicators over USB-C as a repeatable spot measurement. On the phone, the Android app stores readings offline, stamps GPS, and syncs when signal returns. At the desk, the Grower portal holds paddock boundaries, paddock notes, point notes, laboratory reports, history, charts and screening insights. Optional TerraTactics Soil Analysis on Grower plans organises what changed in plain language. You can walk the same philosophy on the public demonstration before you commit.
The product promise is a trustworthy field record and honest screening — not magical nutrients-from-a-spike.
TEACHING THE SET TO NEW STAFF
Give new samplers a laminated card:
• Points and depth first
• Wait for settle time
• Moisture and temperature are mandatory notes
• N-P-K are flags, not rates
• If surprised, resample once, then escalate — do not invent a theory in the ute
Shadow them for a round. Most dataset damage is human, not electronic.
EXPLAINING THE SET CLEARLY
The seven indicators are a clarity test. If an explanation sounds like laboratory replacement, pull it back. Repeatable screening, a GPS farm record and optional analysis match what careful farmers already believe about tools: useful, limited and worth having when the limits are spoken aloud.
MOISTURE IN MORE DEPTH — WHAT IT WILL AND WILL NOT DO
Moisture from a portable insertion reading describes the soil–water state at the depth and moment you measured. It supports comparisons between visits at the same point. It helps explain conductivity swings. It does not tell you total profile water storage, deep drainage, or whether the crop is transpiring at yield-limiting stress unless you already interpret it beside crop and weather knowledge.
On irrigation farms, pair shallow moisture with your knowledge of the last set. On dryland farms, pair it with the last effective rain and cover type. When moisture is stable across seasons and conductivity and its derived screens move, you have earned a laboratory conversation. When moisture moved and everything else moved with it, weather may have written the story.
pH IN MORE DEPTH — PAIRING WITH THE OTHER SIX
pH screens sit beside conductivity because saline patches can complicate acidity interpretation at the margin. They sit beside moisture because dry powder and saturated mud are poor moments for confidence. They sit beside temperature for the same seasonal honesty reasons as other electrochemical screens. None of that makes portable pH a laboratory CaCl₂ reading.
Australian liming culture has moved toward treating acidity as a layered profile problem. The seven-indicator visit tells you whether today’s shallow screen at Point 2 is worse than last autumn at the same moisture class. It does not map aluminium at 15 cm. Use the bundle to prioritise depth-separated laboratory work, not to skip it.
CONDUCTIVITY IN MORE DEPTH — CHOIR NOT SOLO
When conductivity, moisture and temperature rise together after a storm, defer panic. When conductivity rises on matched moisture and plants show salt-type stress, escalate. When conductivity and its derived screens rise after banding, note fertiliser timing before calling salinity.
In the portal, view conductivity trends only after checking the moisture recorded with each visit. Real paddock history is more useful than a perfectly clean demonstration series.
TEMPERATURE IN MORE DEPTH — TIMING DECISIONS YOU ALREADY MAKE
Soil temperature supports the same management calendar you already use: when to sow after the break, when to expect mineralisation flush, when cold soil makes side-dress risky. It does not replace Bureau forecasts or paddock walk observations. It anchors the screening record to a thermal moment so an agronomist can trust the visit.
NITROGEN — INDICATIVE TRIAGE ONLY
Portable nitrogen screens respond to moisture, temperature, recent fertiliser, legume history and organic matter in ways that do not translate to a urea rate. GRDC and state extension emphasise nitrogen decisions built on yield goal, protein target, soil test nitrate and ammonium in laboratory extracts, and seasonal outlook — not on a single field proxy.
Ethical use: a nitrogen screen that reads low relative to neighbouring points under similar moisture might justify a laboratory nitrate test before top-dress. Unethical use: multiplying a screen value into kilograms per hectare without method, depth and calibration behind it.
PHOSPHORUS — INDICATIVE TRIAGE ONLY
Phosphorus availability in Australian soils ties to pH, fixation on clays and ironstones, and Colwell or Bray-style laboratory extracts chosen for your soil type. Portable phosphorus screens cannot become Colwell by assertion. They can show that Point 5 consistently reads differently from Point 1 on the same day, which helps target composite or grid laboratory sampling before big capital spend on fertiliser.
In pasture country, phosphorus and acidity interact with legume performance. Use pH screens and pasture history alongside indicative phosphorus when deciding whether the next dollar is lime, phosphorus, or both in laboratory-informed planning.
POTASSIUM — INDICATIVE TRIAGE ONLY
Potassium matters in hay and silage systems where removal is high, and in some horticultural crops. Portable potassium screens suffer the same method and variability limits as other nutrient proxies. Use them to ask whether a laboratory potassium test is due, not to settle a muriate rate.
DRYLAND VERSUS IRRIGATED USE OF THE SET
Dryland growers often lean on pH and moisture comparability across autumns, using conductivity for discrete saline flats and storm follow-up. Irrigated growers lean on conductivity and moisture together when water source or reuse changes, always remembering ECe is laboratory language.
Both groups benefit from keeping nutrient screens in the triage lane. The spend decisions — lime, gypsum, leaching infrastructure, fertiliser blends — stay with laboratory chemistry and accredited advice.
WHAT HISTORY IN THE GROWER PORTAL ADDS
One visit is a photograph. Twenty visits at six named points are a film. The portal stores GPS-stamped readings from the Android app, syncs when connectivity returns, and lets you chart indicator drift. Optional TerraTactics Soil Analysis on Grower plans summarises change in plain language while still treating nutrient values as indicative.
Insights that flag conductivity or pH watches are prompts aligned with screening ethics: investigate, laboratory-confirm, do not prescribe from the flag alone.
INTEGRITY CHECKLIST BEFORE YOU SHARE DATA OUTSIDE THE FARM
Before sending portal exports to an agronomist, check depth consistency, moisture tags on outlier visits, and whether nutrient screens are labelled mentally as triage. When you show someone the portal for the first time, explain that N-P-K on screen are not the numbers on a fertiliser invoice. Integrity builds a useful record; overclaim builds short-term confusion.
BOTTOM LINE
Moisture, conductivity and temperature are measured. pH, nitrogen, phosphorus and potassium are screened from conductivity and must never be treated as independent results or as a basis for rates. The value of the set is not any single number. It is seven indicators at the same point, on a known date, that you can compare to the same seven next season — then take to an adviser without embarrassment.
Read the season, not the sample. Keep the method still. Let the paddock move. That is what the seven indicators are for.
A screening reading is a starting point
TerraTactics readings help you target follow-up sampling. Confirm anything material with
accredited laboratory testing and a qualified local agronomist.
Published 01 August 2026 by David Gilbert
