Phosphorus behavior in soil-water system of paddy field and its environmental impact

Abstract

Abstract: A field experiment with rice showed that P fertilizer application increased the concentrations of resin P in soil and total P in soil surface water,and both of them declined subsequently over time.Compared with applying mineral P fertilizer only,the integrated application of mineral-P and manure resulted in a higher resin P level within 20 days after P application.The total P concentration in soil surface water in the treatment of integrated application of mineral-P and manure was 3.4 times higher than that in the treatment of mineral-P fertilizer application only after 7 days of P application,and also,was 2.8 times higher than that in the treatment where P application rate was doubled.The potential of Ploss from surface water in the treatment of integrated application with manure was more than that in the treatment of applying-P fertilizer only.The effect of applied P sorts on P concentration in soil surface water could be ignored after 33 days of P application.Two drainages were conducted for rice growth,which caused the net P loss loading and its apparent P loss ratio in range of -0.038～0.076kg·m^-2and 0.034～0.100%,respectively.To minimize P loss from rice production area,field drainage should be avoided in the initial week of P-fertilizer application or field harrowing.

Key words: Paddy field, Soil-water system, P application, P loss (potential), Environmental impact

CLC Number:

S143.2

ZHANG Zhijian, ZHU Yinmei, WANG Ke, WANG Guanghuo, DONG Liang . Phosphorus behavior in soil-water system of paddy field and its environmental impact[J]. Chinese Journal of Applied Ecology, 2001, (2): 229-232.

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