Potassium Critical Limit and Response to Soybean in Swell-Shrink Soil, Akola, Maharashtra
Jaya Tamgadge
Department of Soil Science and Agricultural Chemistry, Dr PDKV, Akola, Maharashtra, India.
S. N. Ingle
Department of Soil Science and Agricultural Chemistry, Dr PDKV, Akola, Maharashtra, India.
Sandeep Kumar Tripathi *
Soil and Land Use Survey of India, Hyderabad-500030, Telangana, India.
*Author to whom correspondence should be addressed.
Abstract
The emerging role of K in a number of biotic and abiotic stress situations is discussed including those of diseases and pests, frost, heat/drought, and salinity. A net house investigation was undertaken with 15 soils belonging to swell-shrink soils of Central Research Farm of Akola to determine the critical limit of K and response of soybean (Glycine max L. culture plant JS-335) to K application. The plants were grown up to 45 days and per cent Bray’s value was calculated for each soil which varied from 69.56 to 96.15. The critical limit of K in swell-shrink soil extracted by neutral normal ammonium acetate in statistical method is 143 kg ha-1 and 148 kg ha-1 for soil in graphical method. The critical limit of K for soybean plant at 45 days growth was 0.43 per cent by statistical method and 0.47 per cent by graphical method.
Keywords: Potassium availability, uptake, swell-shrink soil, soybean yield