METHOD OF PRECISION FERTILISATION Russian patent published in 2009 - IPC A01C21/00 

FIELD: agriculture.

SUBSTANCE: method includes sample taking for analysis, determination of plant food element content in soil samples. Compensating fertiliser ratio is calculated taking into account initial element content in soil. The compensating ratio is applied automatically using modern navigation devices. Soil samples meant for agrochemical analysis are collected in the cross points of the grid lines and boundaries of interfiled plots planned on the cartographic field contour in advance. The onboard computer of the aggregate evaluates the distance from its location along the trajectory to the nearest pair coordinate point relative to increased content of plant food element at unit fraction from the distance between the pair points, and compensating ratio of applied fertiliser is calculated according to the formula: N_k=((N_max-N_min)·L+N_p-N_max)·Y, where N_k - applied compensating fertiliser ratio, kg/hectare; N_max - quantity of plant food elements in soil corresponding to pair coordinate point with relative higher value of its content, kg/hectare; N_min - quantity of plant food elements in soil corresponding to pair coordinate point with relative lower value of its content, kg/hectare; L - indices of the distance from the aggregate location to the point N_max of distances between N_min and N_max; Np - planned fertiliser ratio, kg/hectare at unit fractions; Y - correction coefficient of changed conditions of landscape.

EFFECT: accuracy increase of dosing fertilisers.

2 dwg