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Abstract

A method for the fertilization of soil for cultivated plants, whereby nitrogen fertilizer is spread over the cultivated area in conjunction with the sowing of cultivated plants and later during the growing season more fertilizer is spread over the cultivated area. In this method, a basic amount of fertilizer corresponding to a basic crop smaller than the maximum crop is spread over the cultivated area in conjunction with the sowing; a supplementary amount or fertilizer is spread on a limited area; the growth that has taken place in the cultivated area and in the area with supplementary fertilization during a certain time since the beginning of the growing season is measured; the measured growth that has taken place in the cultivated area is compared with the measured growth of the plants that has taken place in the area with supplementary fertilization in the same growing conditions, and, if the growth in the area with supplementary fertilization exceeds the growth in the cultivated area, supplementary fertilization is carried out in the cultivated area, corresponding to the growth of the plants in the area with supplementary fertilization as compared with the growth of the plants in the cultivated area and to the amount of fertilizer used in the cultivated area.

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First Claim