6JAIN R C,NEMA D P,KHANDWE R,et al. Effect of phosphorus and potassium on yield, nutrients uptake, protein and oil contents of groundnut (Arachls hypogaea)[J]. Indian Journal of Agricultural Sciences,1990,60 (8) :559 -561.
7BLEVINS D G. The potassium-protein link why some crops need more K than others[J]. Crops and Soils Magazine,1984,36(4):12-13.
8FAGERIA N K, BARBOSA F M P. Screening rice cultivars for higher efficiency of phosphorus absorption [ J ]. Pesq Agropec Bras Brasilia, 1981, 16:777 -782.
9BATTEN G D.A review of phosphorus efficiency in wheat[J]. Plant and Soil, 1992,146:163 - 168.
