EFFECT OF ORGANIC AND INORGANIC FERTILIZER APPLICATION ON RICE PRODUCTION (BRRI dhan28)

Abstract

An experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from November 2021 to May 2022 to examine the effect of organic and inorganic fertilizer application on rice production (BRRI dhan28). The experiment consisted of eight treatments viz. T 1 (control; no organic or inorganic fertilizer), T 2 (100% RDCF; N 100 P 15 K 45 S 20 Zn 3 kg ha -1 ), T 3 (only poultry manure; 100% N), T 4 (only vermicompost; 100% N), T 5 (50% RDCF; 50% NPKSZn kg ha -1 + 50% poultry manure),T 6 (50% RDCF; 50% NPKSZn kg ha -1 + 50% vermicompost), T 7 (25% RDCF; 25% NPKSZn kg ha -1 + 75% poultry manure) and T 8 (25% RDCF; 25% NPKSZn kg ha

+ 75% vermicompost). The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. A significant variation was observed among the treatments due to different levels of organic and inorganic nutrient sources. The treatment T 2 (100% RDCF; N 100 P 15 K 45 S 20 Zn 3 kg ha -1 ) exposed the highest plant height at (92.12 cm) and the treatment T 6 (50% RDCF; 50% NPKSZn kg ha -1 + 50% vermicompost) showed the highest number of tillers hill -1 (17.24) whereas control treatment T 1 (no organic or inorganic fertilizer) showed the minimum results in both plant height and tillers hill -1 . Again, the treatment T 6 (50% RDCF; 50% NPKSZn kg ha + 50% vermicompost) produced the highest number of effective tillers hill -1 (15.87), flag leaf length (21.64 cm), number of filled grains panicle -1 (129.20), panicle length (23.52 cm), grain yield (5.32 t ha -1 ), straw yield (6.14 t ha -1 ), biological yield (11.46 t ha ) and harvest index (46.42%) followed by T 5 (50% RDCF; 50% NPKSZn kg ha + 50% poultry manure) whereas the control treatment T 1 (no organic or inorganic fertilizer) showed the lowest results in all the parameters. In case of post-harvest soil, different treatments of organic and inorganic fertilizers and their combinations showed no significant variation on pH and organic carbon content but available N, available P, exchangeable K, available S and available Zn content of postharvest soil affected significantly. The treatment T 6 (50% RDCF; 50% NPKSZn kg ha + 50% vermicompost) showed highest available N (1.52%), available P (24.52 ppm), exchangeable K (1.216 meq/100g soil), available S (26.44 ppm) and available Zn (0.174 ppm) whereas the lowest available P and available S content was obtained from control treatment T 1 (no organic or inorganic fertilizer). So, the treatment T 6 (50% RDCF; 50% NPKSZn kg ha -1 + 50% vermicompost) can be considered as a potential onefor higher rice production (BRRI dhan28).