Method for mixing upper soil layer with nutritional elements comprises withdrawing upper layer, riddling layer to separate large and fine elements, fine mixed with nutritional elements and thrown onto large elements in ditch

摘要

The method comprises withdrawing the upper layer to create a ditch. The layer is then riddled to separate the large elements from the fine elements and the large elements are thrown into the bottom of the ditch. The fine elements are divided into two parts, the first is mixed with the nutritional elements and thrown on to the large elements and the second part is then thrown onto the first part.