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Performance of tropical pasture legumes grown in southwestern islands of japan xi. the comparison of soil available phosphorus obtained in red yellow acid soil and dark red alkali soil with various methods



Performance of tropical pasture legumes grown in southwestern islands of japan xi. the comparison of soil available phosphorus obtained in red yellow acid soil and dark red alkali soil with various methods



Grassland Science 31(2): 219-224



The comparison was made on R2 value of the regressions of the various plant parameters (Panicum maximum cv. Gatton) against P-levels obtained in the acid soil and in the alkali soil with six P-tests; Bray-1, Bray-2, Truog, Truog modified, Olsen, and Ion exchange resin methods. The P-tests which showed higher R2 value in the regressions of P-levels against rates of P-fertilizer applications, relative plant top DM [dry matter] yields, and relative plant P-uptake were Bray-2, Truog, Truog modified and IER methods, Truog, Truog modified and IER methods, and Bray-2, Truog modified and IER methods, respectively. With the above results, Truog, Truog modified and IER methods were judged as suitable methods for estimating available-P in the soils of South-Western Islands of Japan. However, in view of the range and coefficients of covariation of soil available-P obtained with above three methods. Truog modified method was considered to be the most convenient for evaluating P-response of various pasture plants and for predicting a precise rate of P application required for the optimum plant growth.

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