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Effect of Lopping on Lodging, Productivity and Labor Utilization for Rice Cultivation at Transplanting Aman Season

Md. Sirajul Islam
Principal Scientific Officer
Farm Management Division, BRRI, Gazipur-1701

Setara Begum
Scientific Officer
Farm Management Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

This experiment was conducted at BRRI Farm, Gazipur during Transplanting Aman in a randomized complete block design (Factorial) with three replications. The experimental treatments were: three lopping Viz. i) Control i.e., no lopping ii) lopping at 30 DAT and iii) lopping at 45 DAT; and two cultivars viz. i) BR 22 and ii) BRRI dhan32. Interaction effect of lopping and variety was not significant. The tallest plant (123 cm) was found in ‘no lopping’ treatment followed by lopping at 30 and 45 DAT. A similar trend was observed in lodging (%) and labor requirement for harvesting of rice. Lopping at 45 DAT produced the highest number of filled grain panicle^-1 (117), grain yield (5.9tha^-1) and straw yield (6.5tha^-1) followed by lopping at 30 DAT and no lopping (control). However, there was no significant effect of lopping on labor requirements for threshing of rice. Therefore, effect of lopping on the yield and yield contributing characters of rice showed that lopping had positive effect on yield and decreasing lodging tendency of the studied variety. It was found that lopping at 45 DAT and 30 DAT could increase the rice yield.

Keywords: Lopping; Lodging; Labor, Rice.

Location: BRRI Farm, Gazipur

Start Date: 00-00-2001

End Date: 00-00-2002

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To find out the effect of lopping on yield, yield component of rice and labor utilization.

Methodology:

This experiment was conducted at the West Byde of the Bangladesh Rice Research Institute (BRRI) farm, Gazipur during T. Aman season. The study location is 23°74′N latitude and 88°35′ longitude with an elevation of 8.2 meter from sea level. Sub-tropical monsoon climate condition prevails in the study area. Seventy percent of the total rainfall is received during July to September, with average annual rainfall of 2148 mm. April is the hottest month, with average minimum and maximum temperatures of 23.6°C and 33.7°C, respectively .The experiment was laid out in a Randomized Complete Block design (Factorial) with three replications. The unit plot size was 4m×2.5m and. Thirty days old rice seedlings were transplanted with the planting spacing of 20 cm×20 cm. BRRI developed two modern rice varieties, BR22 and BRRI dhan32 were transplanted with three treatments. The treatments were 3 lopping viz. i) Control (no lopping) ii) lopping at 30 days after transplanting (DAT) and iii) lopping at 45 DAT. BRRI recommended fertilizers such as Urea, TSP, MP, Gypsum and Zinc were applied at the rate of 127-52-82-60-0 kgha-1. TSP, MP, Gypsum and Zinc were applied at final land preparation. Three equal splits of urea were applied at 15, 45 and 55 days after transplanting (DAT).The soils of the study site were characterized as silt clay loam with moderate drainage.

Source of Information: Asian Plant Research Journal 2(2): 1-5, 2019; Article no.APRJ.45839

Article Link (Online Journal): DOI: 10.9734/APRJ/2019/45839

Funding Source:

1. Government

Budget: 0.50 lakh tk.

Total Budget (Tk.) :

Achievement/Findings:

Effect of lopping and variety on the yield and yield contributing characters of rice showed that lopping had positive effect on yield and decreasing lodging tendency of the studied variety. It was found that lopping at 45 DAT and 30 DAT could increase the rice yield. BR22 and BRRI dhan32 had statistically similar effect on lodging tendency. Lopping has a great advantage on reduction of labor requirement in harvesting as well as it saves cost of production. Lopping has shown the advantage in reducing the need for labor in the harvest, this implies savings in cost of production, an increasingly sensitive factor in food production. But optimum time of lopping may varied on cultivar and management practices.

Knowledge Management: Journal, Report/Proceedings