A field experiment was conducted for producing higher processing grade tuber yield and quality by evaluating in relation to different planting times (31 October, 15 and 30 November) and dehaulming dates (80, 90 and 100 days after planting) during 2012-13 potato growing season at Bangladesh Agricultural Research Institute, Gazipur. Results revealed that different growth parameters like plant height, leaves number per hill and foliage coverage were significantly influenced by planting times. Processing and non processing grade tuber number and yield were significantly affected by all the treatments and their interaction. Significantly higher yield of processing grade tuber were recorded in November 15 planting in combination with all the dehaulming dates, ranged from 20.67 to 21.50 t/ha. Processing quality parameters like specific gravity, dry matter, reducing sugar content were significantly varied by planting times, dehaulming dates and their interaction. Whereas the potato chips colour score were not affected by the planting time and dehaulming but all the processing quality parameters were remained in acceptable range. The highest net return (Tk 1,68,404/ha) with a BCR of 1.93 was obtained in November 15 planting with dehaulming at 90 days after planting.
The experiment was carried out at the research field of the Department of Agronomy of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during December 2016 to April 2017 to investigate the effect of different phosphorus levels (0, 30, 60 and 90 kg P ha-1) on the growth and yield of four selected cowpea genotypes (BARI Felon-1, A-06008, VI046192 and VI034386). The experiment was laid out in a factorial randomized complete block design with three replications. The results indicated that, among the genotype, BARI Felon-1 required minimum days to 1st (96 DAS) and 50% flowering (108 DAS) showing the highest absolute growth rate (0.71 g day-1), crop growth rate (23.69 g m-2 day-1), relative growth rate (0.047 g g-1 day-1), net assimilation rate (1.40 g m-2 day-1), leaf area index (6.68), SPAD value (51.03), seed length (0.71 cm) and breadth (0.54 cm). But the genotype, A-06008 gave the highest grain yield (0.62 t ha-1). Application of phosphorus at 90 kg ha-1 showed the highest leaf area index (6.67), SPAD value (50.98), pod length (14.33 cm), seed length (0.70 cm), seed breadth (0.50 cm) and grain yield (0.34 t ha-1). In terms of growth and yield, the cowpea genotype A-06008 showed the best performance at the phosphorus level of 90 kg ha-1.
Bangladesh Agron. J. 2021, 24(1): 25-36
High salinity is a critical environmental menace hampering crop growth and productivity worldwide. Therefore, dissecting the salt tolerance potentials and identifying resilient genotypes are crucial to secure sustainable crop production. In this study, we explored the salt resistance potentials of three advanced cowpea lines including one check variety exposed to different salinity levels (0, 50 and 100 mM of natural saline water) by quantifying their growth, physiology and yield‐related attributes. Our results implied that salt‐stress resulted in a significant reduction in the morphological, physiological and yield attributes at both 40 and 60 days after sowing when compared to non‐stress plants. Interestingly, we noticed that one of the latest cowpea genotypes (BU‐C‐Acc‐3) sustained better performances in terms of growth, physiology and yield‐related characters at both 50 and 100 mM salt treatments, while other genotypes exhibited varying levels of salt responses. Further, a multivariate analysis showcased that genotype ‘BU‐C‐Acc‐3’ acquired a combination of physiological and yield contributing responses that ultimately induced a higher level of resistance and grain yield. Collectively, our study offers some contrasting genotypes which could be incorporated in current cowpea breeding programmes to improve grain yield and salt tolerance using conventional as well as molecular breeding tools.
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