PERFORMANCE OF DIFFERENT RICE VARIETIES AS INFLUENCED BY ORGANIC AND INORGANIC NUTRIENT MANAGEMENT PRACTICES

Abstract

The experiment was carried out at the research field of Sher-e-Bangla Agricultural University, Dhaka during the period from November 2020 to May 2021 to study the performance of 3 different types of rice varieties which are influenced by different level of organic and inorganic nutrient management practices. The experiment comprised of five treatment combinations viz., T 1 ii (RFD: N 120 P 16 K 100 ), T 2 (75% RFD + Cowdung 2.5 t ha -1 ), T 3 (50% RFD + Cowdung 5 t ha (100% RFD + Cowdung 5 t ha -1 )

and T 5 (cowdung 10 t ha -1 )

S 10 Zn 2 -1 kg ha ), T 4 with three rice varieties viz., V 1

(BRRI dhan28), V 2 (BRRI dhan34) and V 3 (BRRI dhan81) laid out in Randomized Complete Block Design (RCBD) with three replications. Different treatments of organic and inorganic nutrients combination showed significant variation on maximum parameters of the study. Treatment T 4 (100% RFD + Cowdung 5 t ha ) showed the best performance on different growth, yield contributing parameters, yield parameters and nutrient status of post harvest soil followed by T 2 (75% RFD + Cowdung 2.5 t ha -1 ) whereas the treatment T 5 (cowdung 10 t ha -1 ) performed lowest. Similarly, V 3 (BRRI dhan81) gave best results on different studied parameters and performed highest yield followed by V 1 (BRRI dhan28) whereas V 2 (BRRI dhan34) showed least performance. Regarding, ccombined effect of different treatments of organic and inorganic nutrients combination and variety, significant variation was found on most of the studied parameters. The highest plant height (104.50 cm), number of tillers hill -1 (20.78), number of effective tillers hill -1 (18.22), length of flag leaf (36.32 cm), panicle length (24.93 cm), number of filled grains panicle (166.70), number of un-filled grains panicle -1 (18.55), grain yield (7.15 t ha -1 ), straw yield (8.22 t ha -1 ) and harvest index (46.48%) were recorded from the treatment combination of T 4 V 3 while T 4 V 1 showed the highest 1000 grain weight (21.51 g) whereas the least performance was recorded from the treatment combination of T 5 V 2 . ph of post-harvest soil showed non-significant variation among the treatment combinations but available P and S content influence significantly. As there is some addition of cowdung, so, organic carbon content showed be more in the treatments are also showed be significant. The maximum available phosphorus and Sulphur content of post harvest soil (25.72 and 30.90 ppm, respectively) were achieved from T 4 whereas the minimum (18.26

and 24.04 ppm, respectively) were found from T 5 V 2 . From the above result, it was found that, among the treatment combinations of organic and inorganic treatments with variety, T 4 V 3 (100% RFD + Cowdung 5 t ha -1 with BRRI dhan81) can be considered as the best followed by T 4 V 1 V 3 (100% RFD + Cowdung 5 t ha with BRRI dhan28).