Studies on the Improvement of Upland Farm Cropping : (II) Growth of succeeding summer crops on soil with cropping of different preceding winter crops

Abstract

We had non-fertilizers and 3 nutrient elements plots in soils that 4 winter cops had been cultivated on, and millet and peanut under these plots were cultivated in pots. The highest growth and dry matter of millet following winter crops, were in the following order : common vetch>rape>naked barley and wheat, in the dry matter of peanut so like. Residual P2O5 and K2O in these soils were more effective on succeeding crops than the N, but generally we recognized a little effect on the crops following wheat and naked barley. The effect of 3 nutrient elements was remerkable on the crops following common vetch and rape, on all crops that of N was so, but on the crops following wheat and naked barley that of P2O5 was a little. As stated above, this test showed the same results as field test, application of N did remerkable effect, and so pot test instead of field test may be able to know the relation of succeeding crops to preceding crops.