ABSTRACT
The critical limit of boron (B) in soils and plant (berseem, Trifolium alexandrinum) was determined through a pot culture experiment with 10 soils of Kashmir, representing 10 major districts of the valley falling under three altitudinal locations viz. low, medium and high. Hot water soluble (HWS) B in these soils was positively and significantly correlated with the dry matter yield of berseem, B concentration in plant tissues and B uptake. A positive significant correlation was also observed between pH and HWS B. The critical concentration of soil available B and plant tissues B was 0.48 ppm and 23.0 ppm for first cutting and 0.49 ppm and 19.0 ppm, respectively. Almost 50% of the soils studied were found to be deficient in B.