Yield potential of 16 rice genotypes including 12 hybrids, 3 inbreds, and I new plant type (NPT), were studied at the International Rice Research Institute farm under optimum crop management to achieve maximum attainable yields during the wet season (WS) of 2004 and dry season (DS) of 2005. Yield and yield components were determined at maturity. 1R76712H produced the highest grain yield (7.7 t/ha) followed by 1R75217H and Magat (7.6 t/ha) in WS; in DS, 1R79118H produced the highest grain yield (9.17 t/ha) followed by 1R73855H (8.9 t/ha) and SL-8H (8.8 t/ha. The high yield of hybrid rice was due to high harvest index (0.50). Hybrid produced significantly higher productivity (80.2 kg/ha/day) than inbred in DS, but the difference was not significant in WS. Hybrid produced higher spikelets/panicle and 1000-grain weight than inbred rice. Spikelet filling percent was higher in inbred than hybrid rice. The NPT rice genotype had the lowest spikelet filling percent, but the highest 1000-grain weight across the season. Keywords: Yield; yield attributes; hybrid and inbred rice genotypes. DOI: 10.3329/bjar.v35i2.5897Bangladesh J. Agril. Res. 35(2) : 343-353, June 2010
A study was conducted at PurbaTethulia village, in Dingaputa haor of Mohangonj Upazila in Netrakona district during the period from October 2011 to April 2012. The objective of the study was to diversify and intensify crops in the research site and to develop a more productive cropping pattern. In the trial, Potato-Boro rice-Fallow cropping pattern was followed. The experiment was laid out in a randomized complete block design with five replications. The agronomic productivity (rice equivalent yield t ha-1) of the Potato-Boro rice-Fallow cropping pattern was 24.32 t ha-1with economic productivity (gross margin Tk ha-1) of 163210 and the benefit cost ratio of 1.80. Potato-Boro rice pattern may be disseminated in haor areas of similar environment.Res. Agric., Livest. Fish.2(2): 247-251, August 2015
An experiment was conducted during 1999 and 2000 kharif seasons to know the right time of incorporation of groundnut crop residue and its subsequent effect on the following rice crop. The treatments of the experiment were five incorporation time of groundnut crop residue i.e., 12 days before transplanting (12 DBT), 9 DBT, 6 DBT, 3 DBT and 0 DBT of following T. aus rice along with a control (no incorporation of residue). The results showed that yield contributing characters and yield of T. aus rice varied significantly and increased with the increase of incorporation time. But incorporation at 3 days before transplanting performed worst due to seedling mortality by gas injury. The other incorporation time treatments gave identical grain yield (3.69-3.99 t ha -1 in1999 and 3.90-4.10 t ha -1 in 2000)and straw yield (3.89-4.67 t ha -1 in 1999 and 4.00-4.43 t ha -1 in 2000). The average highest grain yield (4.04 t ha -1 ) was obtained from the treatment 12 DBT.
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