Two varieties of pigeon pea viz., BC (local) and ICPL 88039 were grown on the sandy loam soils of AICRPDA research farm of B. N. College of Agriculture, AAU in two consecutive kharif seasons of 2012-13 to 2013-14. Both the cultivars were sown on three different dates at ten days interval starting from 3rd June to 23rd June. GDD accumulation for attaining different phenological events viz., emergence, initiation of 1st flower bud and flower appearance, 50 per cent flowering, 1st pod formation, 1st seed formation and physiological maturity were worked out. The cumulative GDD accumulations up to physiological maturity were relatively higher in BC (local) which varied from 3395.6 to 3593.5 °C day, whereas, in ICPL 88039, it varied from 2945.0 to 3296.7 °C day in different sowings and seasons. A decreasing trend in accumulated GDD for attaining any Phenological event was observed with successive delay in sowings in both the cultivars in the two seasons. In both the crop seasons, Pheno-Thermal Index (PTI) varied from 16.67 to 18.18 °C day growth day-1, in BC (local) and 18.31 to 19.11 °C day growthday-1 in ICPL 88039 during the vegetative growth period under all the sowing dates while, in the reproductive growth stage, it was comparatively lower and ranged from 7.96 to 8.23 °C day growthday-1 in BC (local) and 10.28 to 11.87 °C day growthday-1 in ICPL 88039. Seed yield heat use efficiency (HUE) in BC (local) varied from 0.207 to 0.296 kg ha-1 °Cday-1, whereas, in ICPL 88039 it varied from 0.201 to 0.312 kg ha-1°Cday-1 under different sowing dates in both crop seasons. Seed yield heat use efficiency was relatively higher in 2013-14 followed by 2012-13 in both the cultivars which indicated the significant differences in using the heat, available to the plants.
Six levels of energy input were used to cultivate three Sali paddy varieties of different durations. Operationwise as well as source-wise energy output, energy efficiency and energy productivity for different levels of energy input in paddy varieties were determined. Studies showed that with increase in the level of mechanization, the human and animal hour requirement for paddy cultivation was reduced from 795 to 350 and 352.5 to 22.5 hr/ha, respectively. Thus mechanization helped in a substantial reduction of drudgery of human and animals. Total energy requirement for paddy cultivation in the studied six levels of energy input ranged from 5630 to 8448 MJ/ha. Energy used in paddy cultivation could be reduced by 8 to 23% through increasing the level of mechanization. Under these six input energy levels and varieties, output parameters viz., output energy, energy use efficiency and energy productivity ranged from 35456 to 85922 MJ/ha, 5.94 to 13.09 and 0.4 to 0.89 kg/MJ, respectively. For all the levels of energy input, higher values of output energy parameters were observed in the long duration variety Ranjit compared to other two varieties. The benefit-cost (B:C) ratio under different levels of energy input varied from 0.95 to 2.90.
Rainfall is one of the most important climatic variables that determine the spatial and temporal patterns of climate variability of a region, which provides useful information for the planning of agricultural production. For the purpose of crop planning, rainfall data of two districts of Tripura viz., Unakoti and West Tripura for aperiod of 20 years (2001-2020) were collected and used to analyze probability of weekly rainfall. The incomplete Gamma distribution probability analysis using the method suggested by Victor (2000) was used to find and analyze weekly rainfall probability for the studied districts. The investigation revealed that total annual rainfall of Unakoti at 90%, 75% and 50% probability is predicted to be 1640 mm, 1686 mm and 1722 mm respectively. The total annual rainfall of the West Tripura at 90%, 75% and 50% probability is likely to be 1631 mm, 1847 mm and 2108.4 mm respectively. Crops found suitable for kharif season are blackgram, greengram, aman rice. The crops which can be grown in rabi season include cole crops, tomato, chilli, potato, pea, toria etc. Based on the study, crops suited to summer season include short duration greengram, aush rice, sesame, jute in all land situations.
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