EFFECTS OF COWDUNG AND CHEMICAL FERTILIZERS ON GROWTH AND YIELD OF AROMATIC RICE BRRI dhan50

Abstract

The experiment was conducted in the Agronomy field laboratory of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from December, 2012 to May, 2013 to study the effect of cowdung and chemical fertilizers on growth and yield of aromatic rice BRRI dhan50. Five different levels of fertilizers and cowdung as recommended by BRRI for BRRI dhsn5O were used as: Ti: 100% Inorganic fertilizer, T2: 75 % Inorganic fertilizer + 25% Cowdung, Ti: 50 % Inorganic fertilizer + 50% Cowdung, 14: 25 % Inorganic fertilizer + 75% Cowdung, T5: 100% Cowdung. Significant variations were found in growth and yield parameters and nubient content of rice due to the various combinations of organic and inorganic fertilizers. It seems from the results that 100% inorganic fertilizers (Ti) showed the best result during initial stage of plant height but in later stages combination of organic and inorganic fertilizers (1'2) showed best results (82.97cm and 91.87cm respectively). Leaf length, number of total tillers hilt1 and number of effective tillers hill-' showed best result during different growth stages of rice plant by using chemical fertilizer only (Ti) and all of that cases it was followed by 12. Panicle length (22.52 cm), filled grain panicle-' (135.33), grain yield (4.07 t ha1), 1000 seed weight (20.84 g) and dry weight of straw (0-45 kg rn-2) always counted superior result for the treatment T2: 75 % inorganic fertilizers + 25% Cowdung. Percent unfilled grain (17.1$) was highest in T5 and harvest index (45.45) was superior for the treatment Ti. And all of the cases inferior results were given by T5 treatment i.e 100% Cowdung only. Significant effect also found in different chemical composition of straw and grain by using different combinations of fertilizer doses. Significantly the highest N, P and K contents of grain and straw were recorded in T1 (100% Inorganic fertilizers) and 12 (75 % Inorganic fertilizers + 25% Cowdung). The lowest N, P and K content in grain and straw were found from the treatment using Cowdung (15) only.