Effect of fertilizer nitrogen on plant and soil at different methods of application of nitrogenous fertilizers. 1. Uptake of nitrogen by buckwheat at layer application of nitrogenous fertilizers Semenov, V.; Kudeiarov, V.; Sokolov, O. Agrokhimiia (9) 9-18 1981 https://eurekamag.com/research/015/602/015602548.php