«J. Bangladesh Agril. Univ. 11(2): 249–256, 2013 ISSN 1810-3030 Performance of transplant Aman rice as influenced by tiller seedlings and nitrogen ...»
88 11.30b 9.20b 2.09a 24.41b 126.7b 13.35b 140.0b 24.86ab 3.87bc 4.12 48.67 Prilled urea (1/2 at 1594.78 7.55c 5.77d 1.78ab 23.36b 121.0b 18.32a 139.3b 23.50b 3.38c 3.81 47.22 DAT+1/2 at 30 DAT) Prilled urea (1/3 at15 98.82 8.93c 7.29c 1.64b 23.69b 120.4b 17.99a 138.4b 24.33b 3.73bc 3.94 49.35 DAT+1/3 at 30 DAT+1/3 at 45DAT) USG 1.8g 95.02 14.10a 12.92a 1.18c 28.79a 138.3a 12.50b 150.8a 25.96a 4.48a 4.61 49.37 USG 2.7g 96.95 8.22c 6.49cd 1.73ab 24.36b 123.3b 17.24a 140.5b 24.61ab 3.92b 4.04 49.26 CV(%) 7.93 8.15 9.83 31.29 5.57 8.93 22.46 7.29 7.67 8.15 9.49 11.72 Level of sig. NS * * ** * ** * * * ** NS NS In a column, figures having similar letter(s) do not differ significantly whereas the figures with dissimilar letter(s) differ significantly as per DMRT NS indicates not significant * indicates significant at 5% level of probability ** indicates significant at 1% level of probability Interaction effect Panicle length was significantly affected by the interaction between variety and age of tiller seedling. The longest panicle (27.18 cm) was obtained when 25-day old tiller seedlings of BRRI dhan49 were planted and the shortest (23.48 cm) was obtained when 35-day old tiller seedlings of BRRI dhan51 variety were planted (Table 4). Panicle length, 1000-grain weight, grain yield, straw yield and harvest index were significantly influenced by the interaction of variety and nitrogen management.
Crop characters and yield were also influenced by the interaction between age of tiller seedlings and nitrogen management. The highest number of total tillers hill-1 (14.17) was obtained in of 35-day old tiller seedlings fertilized with USG 2.7g and the lowest one (8.03) was obtained in 25-day old tiller seedlings fertilized with USG 1.8g (Table 6). The longest panicle (28.80 cm) was obtained due to the interaction of 35-day old tiller seedlings and application of USG 2.7g and the shortest panicle (22.44 cm) was obtained due to the interaction of 35-day old tiller seedlings in three split application of prilled urea (Table 6). The highest number of grains panicle-1 (138.4) was obtained when 25-day old tiller seedlings were planted applying USG 2.7g and the lowest number of grains panicle-1 (110.4) was obtained when 25-day old tiller seedlings were planted in control (Table 6). The highest number of total spikelets (150.8) was obtained in 25-day old tiller seedlings were planted applying USG 2.7 g and the lowest (129.9) was obtained when 25-day old tiller seedlings with control (Table 6). The highest 1000-grain weight (26.03g) was obtained in 35-day old tiller seedlings fertilized with USG 2.7 g and the lowest one (22.43g) was obtained in 25-day 254 Performance of transplant Aman rice old tiller seedlings fertilized with prilled urea in two splits (Table 6). The highest grain yield (4.48 t ha-1) was obtained due to the interaction of 25-day old tiller seedlings fertilized with USG 2.7 g and the lowest one (2.97 t ha-1) was obtained in 25-day old tiller seedlings with two splits of prilled urea (Table 6). The highest straw yield (4.75 t ha-1) was obtained in 35-day old tiller seedlings fertilized with USG 2.7 g and the lowest straw yield (3.45 t ha-1) was obtained in 25-day old tiller seedlings under control treatment (Table 6).
Conclusion The results revealed that BRRI dhan51 had better performance than BRRI dhan49 in terms of grain yield.
Older tiller seedlings (35-day old) gave higher grain yield compared to younger ones. Application of 1.8 g USG four-hill-1 in every alternate row produced higher grain yield among the treatments. From the results it can, therefore, be concluded that 35-day tiller seedlings of BRRI dhan51 while fertilized with USG 1.8 g appears to be a management practice of rice in Aman season.
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