Patent ID: 6205707
Filing Date: 2001-03-27
Classification: A01C

Abstract:
A method for fertilizing soil for a cultivated plant crop having a maximum crop yield, comprising:spreading a first amount of fertilizer over a first area while sowing seeds for the cultivated plant crop in the first area, the first amount of fertilizer corresponding to a basic crop yield of the cultivated plant crop, the first amount of fertilizer being smaller than a reference amount of fertilizer corresponding to the maximum crop yield;spreading a second amount of the fertilizer on a second area different from the first area, at a time of sowing seeds for the cultivated plant crop in the second area, the second amount of fertilizer being larger than the first amount of fertilizer;determining growth of the cultivated plant crop in the first area and in the second area after a growing season has begun;comparing the growth in the first area with the growth in the second area;calculating a crop forecast yield during a growing season, based on a heat summation accumulated since sowing;determining a supplementary amount of fertilizer for the first area, if the growth in the second area exceeds the growth in the first area, from the growths in the first and second areas, from the first amount of fertilizer used in the first area and from a difference between the basic crop yield and the crop forecast yield; andspreading the supplementary amount of fertilizer in the first area.