Studies on the mineral nutrition of the rice plant: VIII. accumulation of macronutrients in the variety IAC-25

Abstract

Rice plants, IAC 25 variety, were grown in nutrient solution; samples were taken for analysis at different intervals, namely 21, 50, 79, 91 and 112 days after germination. Main conclusions were the following: (1) both dry matter production and accumulation of macronutrients as a function of time were described by typical sigmoide curves; (2) in the period between the second and third sampling the rate for both processes reached maximum values; (3) dilution effects were observed in the content of all the elements except Ca; (4) Ca also was the only macronutrien which does not seem to be translocated from leaves for grainfiling.