CRITICAL LIMIT OF POTASSIUM IN SOIL AND RESPONSE OF WHEAT IN LUNKHI SOIL SERIES

A pot culture experiment was conducted to determine the critical limit of potassium in soil samples from the Lukhi soil series with a wheat crop. The samples differed in water soluble (7.4-41.2 Kg K/ha), exchan geable (30-237.2 kg K/ha) and non-exchangeable K (360-551 kg K/ha). Po tassium uptake varied at different levels of potassium. Loading the po tassium in the soils increased its uptake by plants. Percent response also varied at different levels of potassium. Bray's percent yield was significantly correlated with non-exchangeable K. The critical limit for non-exchangeable K in this series was fixed at 450 kg K/ha in the soils and 1.0 percent in the wheat plants.