Research Article
Comparative Efficiency of Various Potassium Extraction Procedures

S. M. Mehdi, M. Sarfraz, M. Sadiq and G. Hassan

Asian Journal of Plant Sciences, 2002, 1(1), 7-11.

Abstract

A green house study was undertaken to see the comparative efficiency of various potassium extraction procedures in three soil series of Pakistan i.e., the Shahdara, the Sultanpur and the Lyallpur. The data showed that number of tillers plant , grain G1 and straw yield of wheat was increased by the application of N and P fertilizers. Potassium concentration in grain and straw was decreased while its uptake increased with the application of N and P. Potassium release from the native reserves increased with the application of N and P. The amount of K extracted by HNO was maximum followed by NH OAC, MgOAC, CaCl and water 3 4 2 in the descending order. Ammonium acetate gave best correlation between K uptake by wheat plants and K extracted by various chemical extractants when no fertilizer was applied while CaCl proved best extractant when N and P fertilizers were applied. 2 Quantity factor gave best correlation with K uptake at all levels of N and P fertilizers application rates when Quantity, Intensity and Quantity/Intensity relations were studied. In case of Electroultrafiltration (EUF) determination. The values of correlation coefficient (r) were significantly high when K was determined for 35 minutes EUF at control while, 10 minutes EUF at all N and P application rates. In over all comparison of various procedures like water soluble, NH OAC, MgOAC, CaCl , HNO , EUF, Q, I 4 2 3 nd Q/I relations for determining the soil K status and its uptake by wheat plant showed that NH OAc gave the best correlation 4 at zero application of N and P fertilizers, water soluble and CaCl were found best when N and P dose was applied while EUF 2 150 100 10 minutes and CaCl were good when N and P were applied. The activity ratio (Q/I) did not prove good parameters to 2 200 150 measure the K availability status of the soils. Though the chemical extractants gave comparatively better correlation with K uptake but EUF method is a rapid and easy. So it should be used for routine work to get accurate and rapid results.

ASCI-ID: 7-42

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