Soil-Plant K Interrelationships in Six Soil Series Differing in K Status through Short-Term Absorption Studies with Sorghum

Samples of fifteen soils each from six soil series occurring willely in six states of India and differing in K supply parameters were studiedfor K supplying capacity with the help of Neubauer technique using sorghum as a test crop. The soils were stmdy loam to cltiy in texture and low to high in 1N NH₄ OAc-K and HNO₃ extractoble potassium. Potassium supply considerably influenced dry matter yield and K uptake and its distribution in shoot-root ponions of the crop. The lowest and highest estimates of these porameters woe in soils low and high in both NH₄ OAc-K, and HNO₃-K, respectively. Amajor part of potassium is absorbed by plants from nonexchangeable K. Both NH₄ OAc-K and HNO₃-K correlated significantly and positively with plant K.