Studies of Direct-Sowing Culture by Broadcasting Seeds on a Submerged Paddy Field : No. 6 Effects of seeding density and amount of fertilizer on the growth and yield of rice

This experiment was carried out in the paddy field attached to okayama University School of Agriculture by broadcasting KIBIYOSHI seeds on the water submerged condition on June 9, 1964. The treatments of seeding density were 50, 100, 150, 200 and 250 hills/m2, and the levels of basic fertilizer (nitrogen) used were 11.4 g, 16.3 g and 24. 5 g/m2. The number of panicles per square meter was about 500 at most. Except in the lowest density treatment (50 hills/m2), the number of spikelets per panicle, the number of grains and the weight of 1, 000 brown rices were hardly influenced by the seeding density and by the amount of the basic fertilizer. The amount of rice yield per unit area was found highly in the treatments where the number of hills ranged from 100 to 200, and in the treatment of 250 hills the rice plant grew too thick.