Two cotton fields across nine satellite passes. The reported percentage is the grower’s own estimate from our in-app feedback form; the sections below check it against the advisory’s own numbers.

Cotton in Maharashtra is a crop with a narrow margin and a long list of ways to lose it. Water it on a calendar and you overwater the seedling and underwater the boll. Miss pink bollworm and the season is gone. This grower did something unusually clean: he mapped two fields before the crop was up, and let the advisory follow them from germination onward.

Nine satellite passes at five-day intervals, from 16 July to 25 August 2026, produced 19 field advisories. He submitted feedback on the 20 August advisory, covering both fields, and answered Yes to both questions he was asked: the report helped him take action on pest, disease or weed issues, and it helped optimise his irrigation — by an estimated 30–50%. That is the largest irrigation figure anyone in this series has reported, so it is worth checking against the advisory’s own numbers.

Illustrative. Cotton at flowering — creamy-white flowers, one already turned pink with age, green squares and young bolls on the same plant. Both fields reached this stage in the last week of August. Representative imagery, not a photograph of the grower’s own fields.

Nine passes, five stages, two fields

The two fields are 5.30 and 4.79 acres, sown on 25 and 24 June 2026 respectively — one day apart. Monitoring began on 16 July, when both were still at germination and seedling establishment. What followed is the clearest stage sequence in this series.

Two things are happening at once in that chart, and it is worth separating them honestly. The first is stage: cotton’s water requirement is not flat across the season, and the model’s crop coefficient changes as the plant moves from branching into squaring and flowering. The second is delivery method: from 15 August the schedule is quoted against drip rather than flood, and drip delivers less water for the same soil-moisture outcome because it wets the root zone rather than the whole field surface.

Both are real savings and both are in the advisory. What matters is that the second one is not a surprise the grower discovered after the fact — the advisory had been publishing the drip number beside the flood number on every prior pass.

What the satellite cotton crop advisory delivers per field

Each field receives its own report per satellite pass: a seven-day irrigation schedule with the delivery method quoted and two alternatives priced in millimetres per day, per-nutrient fertiliser rates with an organic and a chemical source for each and an application frequency, pest and disease risk as percentage scores with paired organic and chemical solutions, weed pressure, soil chemistry and a yield estimate with a harvest window.

Irrigation: the advisory priced drip against flood every single week

This is the mechanism behind the 49%, and it is the most quietly useful thing in the whole report.

On 10 August, while flood was still the method the schedule was quoted against, the same table listed drip below it: 5.0 mm for flood against 4.0 for drip on the larger field, and 6.0 against 4.5 on the smaller. Twenty and twenty-five per cent less water per event, for the same job, sitting in plain sight in every weekly report for five consecutive weeks.

Illustrative. Flood irrigation in cotton — the delivery method the schedule was quoted against through July and the first half of August, at 20 to 40 mm a week. Representative imagery.

Illustrative. Drip at the plant base — the method the schedule has been quoted against since 15 August, at 7 to 17 mm a week. The wetted circle is the whole point: the water goes to the root zone rather than across the row. Representative imagery.

Note also that the event count fell, not just the volume. Under flood the schedule ran four irrigation days a week on both fields; under drip it runs three or four, at roughly a fifth of the volume per event — 4.2 to 4.5 mm against 5.0 to 6.0, on fewer or equal days. Fewer events at lower volume is also less pumping, and pumping is the cost a Maharashtra cotton grower actually pays.

The larger field’s current irrigation card: 13.5 mm total across three irrigation days, a 06:00–08:30 delivery window, per-day rainfall and precipitation probability, and the method selector at the foot showing Drip.

Fertiliser: two fields, one day apart, 3.7× the potassium

Cotton takes potassium hard through boll development, and the two fields are in different positions on it. On the 25 August pass the larger field was prescribed 20.7 kg/acre of potassium; the smaller field was prescribed 75.8 — three and a half times as much.

The reason is in the readings rather than the crop. The larger field’s potassium sat inside its target band; the smaller field’s sat below it. On the smaller field, nitrogen and phosphorus both came back at optimal level and nothing was prescribed for either — the card lists only potassium, sulphur and zinc, with the header reading 0 Need Attention, 3 Monitor Closely, 2 Optimal Level.

The smaller field’s fertiliser card. Nitrogen and phosphorus are the two entries at optimal level and are therefore absent from the list entirely; the money goes to potassium at 75.8 kg/acre of muriate of potash, with sulphur and zinc behind it.

Zinc is prescribed on both fields — 4.55 and 8.5 kg/acre of zinc sulphate heptahydrate — and that is not incidental. Both soils read alkaline, at pH 7.8 and 7.6, and zinc availability falls sharply above about pH 7.5 regardless of how much total zinc the soil contains. A high-pH cotton soil with 0.10% organic carbon is close to a textbook setup for latent zinc deficiency, and the advisory picks it up on both fields.

The larger field’s card for comparison. Same crop, same week, next door — and a different list, because the underlying readings differ.

Pest and disease: pink bollworm on both, and a different second insect on each

Pink bollworm (Pectinophora gossypiella) leads both fields — 75% on the larger, 80% on the smaller — and that is the correct answer for Maharashtra cotton at flowering. Pink bollworm is the pest that has reshaped Indian cotton economics over the last decade: it feeds inside the boll, so by the time damage is visible from outside it is already done.

The organic solution offered against it is pheromone trap installation, with emamectin benzoate as the chemical route. That ordering matters: pheromone traps are the first line in every Indian pink bollworm IPM protocol precisely because they work on monitoring and mating disruption rather than on killing larvae that are already inside the boll.

Illustrative. A cotton boll opened to show internal bollworm damage — stained lint, an eaten seed, frass in the cavity. Nothing on the outside of an intact boll tells you this is happening, which is why an early probability score is worth more than a late inspection. Representative imagery.

The second insect differs between the fields. The larger field carries cotton aphid (Aphis gossypii) at 60%; the smaller carries whitefly (Bemisia tabaci) at 75%. Both are sucking pests but they are not interchangeable — Bemisia is the vector for cotton leaf curl virus and carries a much higher consequence than aphid feeding damage alone, and the chemical routes offered differ accordingly: acetamiprid against the aphid, diafenthiuron against the whitefly.

The smaller field’s card: pink bollworm at 80%, whitefly at 75%, bacterial blight at 80%. The organic column leads with pheromone traps and neem oil before either chemical is named.

On disease both fields carry bacterial blight (Xanthomonas citri pv. malvacearum) — 70% on the larger, 80% on the smaller — and grey mildew (Ramularia areola) at 55% and 65%. Both are named to the pathovar and species rather than left as “leaf spot”, and the organic option in both cases is a biological (Pseudomonas fluorescens or Trichoderma viride spray) rather than a copper-only fallback.

Illustrative. Angular bacterial blight lesions on a cotton leaf, bounded by the veins — the symptom behind the 70% and 80% scores on these two fields. Representative imagery.

The larger field’s card from the same pass, for comparison: the same bollworm at 75%, but cotton aphid rather than whitefly behind it.

The weed lists diverge too, and the smaller field’s is the more serious. It leads with Parthenium hysterophorus at 80% — congress grass, the invasive that has colonised field margins across Maharashtra, is allelopathic, and is a recognised human health hazard as well as a crop competitor. The larger field leads with purple nutsedge at 70% and jungle rice behind it.

Illustrative. Parthenium hysterophorus encroaching from a field margin into a cotton crop. Once established it suppresses germination around it chemically as well as competing for light and water. Representative imagery.

What the numbers add up to

The advisory published the drip figure beside the flood figure for five weeks running. The saving was never hidden — it was a number in the weekly report.

Grower-reported outcomes, as submitted

The cards below reproduce Vilas Deshpande’s answers to our in-app feedback questionnaire for the advisory dated 20 August 2026, which covered both fields, exactly as recorded.

The percentage is the grower’s own estimate from a structured form rather than a metered volume. What makes this case unusual in the series is that the advisory data supports it independently: the recommended weekly volume across the two fields fell by 49% between the flood-quoted and drip-quoted periods, which is inside the range he reported without knowing our number.

Two fields sown a day apart. In the first monitored week one was given 28 mm and the other was told to irrigate nothing at all.

Why starting at germination mattered

Most accounts in this series began monitoring mid-season, on a crop already established. This one began on 16 July, with both fields at germination and seedling establishment — and the difference shows in the first row of the table. Field A was given 28.0 mm that week; field B was given zero. Two fields sown a day apart, and one of them was told not to irrigate at all in its first monitored week.

That is the least intuitive instruction in the entire sequence and it is the one most likely to be ignored. Cotton at seedling stage needs enough moisture to establish and not much more; overwatering a young cotton crop encourages shallow rooting and rank vegetative growth at the expense of later fruiting. A grower irrigating on a calendar would have watered both.

Starting early also means the stage transitions were caught as they happened rather than inferred. The advisory recorded squaring on 15 August, first flowering on 20 August and bloom or boll development on 25 August — three stage changes in ten days, each with its own water and nutrient consequence. On a five-day satellite cadence those transitions land in the report within days of occurring in the field.

Why per-field beats per-farm on two adjacent fields

The yield estimates are close — 680 kg/acre of seed cotton on the larger field and 640 on the smaller, both harvesting in December 2026 — which makes the divergence in everything else more striking rather than less. Two fields with almost the same expected output needed different potassium, faced a different second insect, carried a different leading weed, and by late August were reading at different growth stages despite being sown a day apart.

The soil explains part of it. Both fields read 0.10% organic carbon and low salinity, but pH differs — 7.8 on the larger field, flagged high, against 7.6 on the smaller, flagged medium. On alkaline soils that half-point matters for micronutrient availability, and it is visible in the zinc prescriptions being nearly double on the field with the marginally lower pH but the lower zinc reading.

Underneath sits a per-pixel read of each field from satellite, resolved through crop coefficients and regional pest models. Nineteen advisories over nine acquisition dates in six weeks is a fast cadence for a crop that changes stage this quickly — which is exactly why it caught three transitions in ten days.

Running this on your own cotton

1. Map the field before the crop is up. The most valuable instruction in this sequence was a zero in the seedling week, and it would have been missed by starting mid-season.
2. Read the alternative methods, not just the recommended one. Drip sat 20–25% below flood in the same table for five weeks. That is a conversion business case, computed weekly on your own field.
3. Expect the schedule to change at every stage transition. Squaring, first flowering and boll set all landed within ten days here, each with a different requirement.
4. Check potassium separately per field. 20.7 against 75.8 kg/acre on fields sown a day apart is the difference between feeding the boll and wasting the bag.
5. Take the pink bollworm score seriously and early. The damage happens inside the boll, and pheromone traps are a monitoring and disruption tool — they have to go up before the score becomes a visible infestation.

Explore the platform at sat.farmonaut.com, read more about our satellite and AI-based farm advisory in the JEEVN AI overview, or talk to our team about monitoring a cotton block. JEEVN AI is a paid product; plan detail is on the platform.

Frequently asked questions

Glossary

Squaring

The stage at which cotton forms flower buds, called squares. The first reproductive stage, and where the water and nutrient requirement begins to shift away from vegetative growth.

Boll

The seed capsule that holds the lint. Boll development is potassium-hungry, which is why potassium dominates the fertiliser prescription on the field further into the stage.

Pink bollworm (Pectinophora gossypiella)

A moth whose larva feeds inside the developing boll, damaging both lint and seed before external symptoms appear. The defining pest of Indian cotton economics.

Crop coefficient (Kc)

The multiplier applied to reference evapotranspiration to get a crop’s actual water requirement at a given growth stage. It is why the same field’s schedule changes when its stage does.

Parthenium hysterophorus

Congress grass — an invasive weed widespread across Maharashtra that is allelopathic, suppressing germination of nearby plants chemically as well as competing for resources.

Case-study basis: JEEVN AI field advisories for a single Farmonaut account — all 19 advisories generated for the account’s two cotton fields across the nine satellite passes from 16 July to 25 August 2026 — plus the account’s in-app feedback submission for the advisory dated 20 August 2026, which covered both fields. Crop, region, field count and area are reported from the account’s own records on the platform; the account holder is named as recorded on his Farmonaut account and precise field locations are withheld. The reported percentage is the grower’s own estimate from a structured feedback form, not a metered or invoiced measurement; the 49% figure is our own calculation from the advisories’ own daily quantities, comparing the mean weekly recommended volume across the five passes quoted against flood irrigation with the three quoted against drip, and it reflects both the change in delivery method and the change in the crop’s own stage-dependent requirement. The delivery method quoted on an advisory reflects the method selected for that field on the platform. All nutrient, pest, soil and yield figures are read directly from the advisories. Pest, disease and weed percentages are modelled probabilities, not confirmed infestations. Yield figures are estimates, not guarantees. Imagery: the five platform screenshots are genuine captures of this account’s own advisory data; the six wider field photographs are AI-generated illustrative imagery, each labelled as such in its caption, and do not depict the grower or his fields. JEEVN AI is a paid product.