... P.L. and Singh, J.S., 1 971 . Herbage dynamics and net primary production in cer-tain ungrazed and grazed grasslands in North America, in Preliminary Analysis of Structure and Function in Grasslands,N.R. ... grassland ecosystems of the world, under varying climatic con-ditions. Singh and Yadava (1 974 ), Sims et al., (1 978 ), Sims and Singh (1 971 ,1 978 a, 1 978 b, and 1 978 c) have presented illuminating ... Yadav and Singh (1 977 ) have described a thoroughlegend of the grasslands of India, while others (Coupland, 1 979 ) have ade-quately dealt with the structure and function of the grasslands of India...