This application is based on day-to-day calculations of agronomy students, agricultural technicians, agronomists, consultants and rural producers.In a few clicks and with little information you will make calculations of:- Seed rate for grains (based to find out amount of seeds according to the final population of plants and vice versa);- Seeding rate for forages (based on cultural value);- Yield estimation for the soybean crop (based on the spacing between rows, number of plants/meter, number of vegetables/plant, number of grains/legume and PMG (Weight of a thousand grains);- Yield estimation for the corn crop (based on the spacing between rows, number of plants/meter, number of ear/plant, number of row/cob, number of grains/row and PMG (Weight of a thousand grains);- Yield estimation for the cotton crop (based on row spacing, number of plants/meter, number of boll/plant and average weight/boll);- Basic calibration of land sprayer (based on flow/ha, flow/min, speed, spacing between tips, etc);- Basic costal pump calibration;- Estimate of harvest losses for Soybean;- Fertilizer rate in the planting line (according to the final fertilizer rate, find out the amount to be collected when adjusting the implement);- Fertilizer formulations (basic calculations for NPK formulation).Application created and thought of saving time and practicality for those who are in the countryside, in the day to day of a rural property.Application in its first version, is developed and linked to the Agronomic Knowledge page.