A Field experiment was conducted at Regional Spices Research Centre, BARI, Gazipur and Spices Research Sub-Centre, BARI, Lalmonirhat to find out the water and nitrogen use efficiency of onion (Allium cepa L.) as influence by different levels of soil moisture regimes and nitrogen doses during rabi season of 2020-2021. The experiment was designed in Factorial Randomized Complete Block Design having three replications. The treatment composed of three soil moisture regiems (10%, 20% and 30% depletion of soil moisture over field capacity) and three nitrogen doses (150, 100 and 75 kg ha-1). The individual as well as interaction effect of soil moisture and nitrogen levels showed significant effect on yield and yield contributing parameters, storability, nitrogen and water use efficiency except the TSS of onion. The highest bulb yield (21.49 t ha-1 in Gazipur & 22.79 t ha-1 in Lalmonirhat), marketable bulb yield (18.0 t ha-1 in Gazipur & 20.0 t ha-1 in Lalmonirhat), harvest index (598.0% in Gazipur & 607.9% in Lalmonirhat) were recorded when the crop irrigated at 10% depletion of field capacity and plant supplied with 100kg Nha-1. Similarly, the maximum nitrogen use efficiency (54.74% in Gazipur & 61.38% in Lalmonirhat) and the maximum water use efficiency (105.76 kg ha-1 mm-1 in Gazipur & 108.06 kg ha-1 mm-1 in Lalmonirhat) were also observed from the above mentioned treatment combinations. Total PLW was higher (16.3% in Gazipur and 21.1% in Lalmonirhat) with irrigation was given applied at 10% depletion of field capacity and application of 150 kg N ha-1 during 120 days of storage.
Bangladesh J. Agril. Res. 47(1): 119-142, March 2022
Centre, Faridpur to evaluate the performances of four chilli lines with BARI Morich-2 as check and to select the suitable planting time during rainy season. The experimental field belongs to high land of Low Ganges River Flood plain (AEZ 12) with clay loam in texture. The experiment was laid out in RCB design with three replications. Four lines and a variety viz., C0711, C0712, C0713 and C0714 and BARI Morich-2 as check were evaluated with three planting time viz., 01 April, 15 April and 30 April. Seedlings of 40 days old were transplanted maintaining of 50cm × 50cm spacing in each case. The crop (Green chilli) was started to harvest from July and completed on August-September, 2016. Among the lines, C0712 emerged as superior in terms of maximum number of fruits/plant (225.7) and weight of fruits/plant (478.6g) and fresh yield (15.43t/ha) while the highest single fruit weight (3.217g) was found from C0714. The 15 April planting date emerged as best in terms of maximum weighed fruit (2.661g), weight of fruits/ plant (409.3g), number of fruits/plant (182.5) and fresh yield (12.14 t/ha). The interaction effect showed that line C0712 transplanted on 15 April gave the heavier fruits/plants (542.2g) with maximum number of fruits/plant (241.3) and maximum fresh yield (16.73 t/ha). The 15 April planting was ideal for rainy season chilli evaluation and the line C0712 was the most stable performing line with respect to different planting dates.
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