Pot and field experiments on the response of rice crop to phosphatic fertilizer (labelled) were conducted on six typical acid paddy soils of Southern China. Good correlations. with mean value γ around -0.98,-0.99 have been found between the response of phosphatic fertilizer and the "A" values of Fried and Dean's method and the "x" values of Sokolov's method. Nitrogen, however, used to be the limiting factor of rice production in these areas and, in these cases, the interaction of nitrogen and phosphorus always gave good response. Under the given condition of pot experiments (0.63 gm. of P2O5 per 5.5 kg of airdried soil), the uptake of phosphorus from applied fertilizer by crops varied from 10 to 20%.
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魯如坤,蔣柏藩.我国南方几种水稻土的磷肥施用問題[J].土壤学报,1962,10(2):175-182. R. K. LU, P. F. CHIANG. EFFECT OF PHOSPHATIC FERTILIZER ON SOME ACID PADDY SOILS OF SOUTHERN CHINA[J]. Acta Pedologica Sinica,1962,10(2):175-182.