Establishing P fertilization recommendation index of different vegetables by STP with the "3414" field experiments in South China
2016
Ding, X. (Guangdong Inst. of Eco-Environment and Soil Sciences, Guangzhou (China)) | Zhang, Q. (Guangdong General Agency for Soil and Fertilizer, Guangzhou (China)) | Wang, R. (Guangdong Inst. of Eco-Environment and Soil Sciences, Guangzhou (China)) | Liao, X. | Li, S. | Ceng, S. | Zhang, Y.
The aim of this study was to establish phosphorus fertilization recommendation index of different vegetables (leafy, gourd and leguminous vegetables) by soil test P (Olsen-P and Bray 1-P) with the "3414" experiments of 121 sites during 2007-2010 in 30 counties of Guangdong Province, China. The results showed that relationship between vegetable relative yield and soil test P was linear with plateau and logarithmic equation model. The optimal amount of P fertilizer was established with soil test P by logarithmic equation mathematical models. The soil P content was calculated by the relative yield of 50, 75, 90 and 95%, to obtain the soil P abundance and deficiency indicators. Taking plentiful-lack of soil-test P as an index, soil Olsen-P and Bray 1-P were classified into five classes corresponding to relative yield of 50, 75, 90 and 95%. This study shows P fertilizer recommended rates were rendered by the models of soil test P with Olsen-P and Bray 1-P for "3414" field experiments for three vegetables.
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