GROWTH AND YIELD OF COMPOSITE AND HYBRID MAIZE AS AFFECTED BY TIME OF IRRIGATION

Abstract

The experiment was conducted at the Farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Ohaka, Bangladesh during the period from October 2009 to March 2010 to study the growth and yield of composite and hybrid maize as aflècted by time of irrigation. The experiment comprised as two factors. Factor A: Maize variety - 2 levels: V 1 : BARI bhutta-7 and V 2 : BARE hybrid bhutta-5. Factor B: Time of irrigation - 8 levels, I: No irrigation: I: One irrigation at 35 DAS; 12: One irrigation at tasseling; 1 3 : One irrigation at silking; 1 4 : Two irrigations at 35 DAS and tasseling; I c : Two irrigations at 35 DAS and silking; L: Two irrigations at tasseling and silking and 1 7 : Three irrigations at 35 DAS, tasseling and silking. The experiment was laid out in split-plot design with three replications. Data on different growth parameter, yield attributes and yield were recorded and analyzed. At 40, 60, 80 DAS and at harvest the tallest plant (23.54 cm, 57.98 cm, 106.88 cm and 170.68 cm, respectively) was recorded from V 2 . while the shortest plant (21.46 cm, 55.58 cm, 99.93 cm and 161.56 cm, respectively) from V 1 . The highest grain yield (7.48 tJha) was found from V 2 . while the lowest (3.96 t/ha) from V 1 . At 40, 60, 80 DAS and at harvest, the tallest plant (25.09 cm, 61.46 cm, 111.51 cm and 175.45 cm, respectively) was observed from 1 7 , again the shortest ([8.64 cm, 50.46 cm, 90.56 cm and 147.07 cm, respectively) from The highest grain yield (6.31 tiha) was obtained from b and the lowest (4.06 tJha) from 10. At 40, 60, 80 DAS and at harvest, the tallest plant (26.53 cm. 63.04 cm. 118.70 cm and 187.10 cm. respectively) was observed from V217 , again the shortest (14.77 cm, 48.27 cm, 78.19cm and 132.31 cm, respectively) from V 110 . The highest cob length (19.63 cm) was found from V 217, while the lowest (11.40 cm) from V 1!0 . The highest cob diameter (3.74 cm) was observed from V 2!7. again the lowest (2.38 cm) from V 1 10 . The highest 1000 grain weight (423.93 g) was given by V 213 . while the lowest (235.23 g) was found in V 110. The highest grain yield (8.48 tTha) was recorded from V 2!7 that similar to V 2!6 (8.04 tiha) and the lowest (2.55 tlha) from V 1 1 0.