“…These losses were less severe, and the crop yield consequently greater, when an inhibitor of nitrification such as nitrapyrin was used (Warren, Huber, Nelson & Mann, Increased nitrogen uptake and grain yield have often been observed to follow the use of nitrification inhibitors on rice paddy (Prasad, Turkehede & Das, 1966;Prasad, 1975 Nishihara & Tsuneyoshi, 1968; Rajale & Prasad, 1975; Sahrawat & Mukerjee, Inhibitors of nitrification have also been used to study ammonium and nitrate nutrition of other plants growing in soil since, in most soils, applied ammonium is quickly nitrified to nitrate. They have been used in studies of wheat (T. aestivum), ryegrass (L. multi$orum) and kale (Brassicu oleraceu) (Spratt & Gasser, 1970), carnation (Dianthus caryophyllus) (Green, Holley & Thaden, 1973) and China aster (Callistephus chinensis) (Haynes & Goh, 1977).…”