Studies on the nutrition of rice plant (Oryza sativa L) . 3. Partial efficiency of nitrogen absorbed by rice plant at different stages of growth in relation to yield of rice (O. sativa var. indica)
Tanaka, A., E.Al.
Proc. Indian Acad. Sci. Sect. B 49(4): 207-16
Partial efficiency of N is defined as the increase in yield of grain or straw for unit increase in N absorbed by the plant. In these experiments, partial efficiency for grain yield is considered. When grown at low levels of N (10 ppm), O. sativa var. indica had 2 peak periods of partial N efficiency for grain production: (1) tillering stage, determining tiller number and panicle number; and (2) flowering time between boot- and milk-stage, influencing grain weight per panicle.