Soil Science & Irrigation Calculations for Agronomy

What you'll build

What you will be able to do

Each lab ends with a concrete result that you build yourself and the checker confirms, cell by cell.

• Check ten soil samples, classify their texture with an IFS rule set, look up the typical available water capacity of each class and measure how many samples are clay-rich.
• Turn eight ring-core samples into bulk density, porosity and volumetric water content, then convert the bulk density into tonnes of soil per hectare.
• Add up the plant-available water of a layered profile down to the rooting depth of maize, then find how much the crop can use before stress and how many days that lasts.
• Turn monthly reference evapotranspiration into the water use of a maize crop, subtract effective rain and size the season's gross irrigation volume.
• Run a 14-day root-zone water balance for the maize field, flag the days on which the depletion passes RAW, count the stress days of the farm's actual plan and chart the depletion against the limit.
• Convert nitrogen targets into kg of product per hectare, total tonnage and whole bags for five fields, then build a DAP + urea + potash programme that credits the N already in the DAP.
• Read the lime need of six fields from a pH × texture table with INDEX/MATCH, correct it for the product's neutralising value and price the whole liming job.
• Compare three irrigation systems for the 24 ha maize field: pumped volume, pumping energy, the annual cost split into water, energy and capital, and a stacked column chart of the result.