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AG Capital Partners — Agriculture calculator
AG CAPITAL PARTNERS / CROP NUTRITION

Better planning.
From the ground up.

Your field. Your crop. A clearer view of its nutrient needs.

Plan your field
AGRICULTURE CALCULATOR 01 — FIELD TO HARVEST
SOIL → CROP → NUTRIENT BALANCE
THE PLANNING DESK

A little detail.
A clearer picture.

Start with your field and soil analysis.
We’ll bring the numbers together.

01Field parameters

About these inputs

Region identifies your field. Select soil and laboratory values below; this model does not apply an automatic regional multiplier.

02Soil

Use the analytical method on your laboratory report. Mineral N and total N cannot replace readily hydrolysable N.

About these inputs

3 million kg/ha is the teaching-method soil-layer assumption; replace it with your sampled layer mass. Humus and pH are recorded for review and do not substitute for nutrient tests.

03Crop

Select a crop to see whether a published removal reference is available.

04Organic fertilizer

Optional. Enter the analysis of the material you will actually apply.

Calculation assumptionsReview or edit

Published references are starting values. Review their suitability for your soil fertility, management and crop before calculation.

Select crop and soil first. Unavailable reference cells must be entered by your agronomist.

Coefficients used in this calculation
ParameterNP₂O₅K₂O
Crop removal, kg/t main product including associated by-product
Recovery from the tested soil pool, %
Other plant-available credit, kg/ha
Recovery from mineral fertilizer, %

Other credit includes previous-crop residues, biological nitrogen fixation and prior organic applications. Enter plant-available amounts without double-counting soil or current organic inputs. The previous crop name alone does not assign a credit.

Mineral recovery defaults: 65 / 17.5 / 55%, the midpoints of the manual’s low-to-medium-rate ranges. These assumptions are editable and are not field-specific recommendations.

Product assays & sulfur targetReview or edit

Convert nutrient rates to product quantities. Assays below are illustrative and must match the actual product certificate.

Each equivalent supplies one nutrient independently. This is not an NPK blend recipe or a product compatibility recommendation.

Sulfur requirements are not inferred by this NPK method. Use a suitable fertilizer and an independently established S target.

Methodology & sources

Fertilizer nutrient = max(0, crop removal − available soil contribution − organic contribution − other credit) ÷ fertilizer recovery fraction.

Soil contribution = laboratory concentration × sampled layer mass in millions of kg/ha × recovery fraction. Organic contribution = application tonnes/ha × nutrient kg/tonne × first-year recovery fraction.

Sources: Timiryazev University balance-method guidance; fertilizer-system practical manual, tables 2, 9 and 10. Removal coefficients are reference averages. The region list follows the reference calculator’s selector.

19 of 38 crop choices have matched removal references. Other crops need explicit expert coefficients. Soil reference gaps remain blank. References for soil P and K recovery apply at the fertility classes stated in the manual; this version does not adjust them automatically for nutrient class, pH, humus, irrigation or weather.

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