Edaphological Studies on the form of Soil humus and Nitrogenic Substance in paddy soil in plots where dressing Experiment of phosphoric fertilizer had been carried. (Part 5)

Abstract

1. More amount of humus was found to be accumulated in plot dressed with phosphate than in plot undressed with that component. 2. Humus more liable to decompose was found to be accumulated in phosphate-dressed plot than in undrssed plot with phosphate. In other words, there must be some differences in the form of humus or nitrogenic substance in both plots. 3. Therefore the dressing with phosphate increases soil fertility owing to above-mentioned two points : in this paper the second point was considered to the increase of fertility and discussed its contributing mechanism.