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

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

Dr. Jahan Ullah Chowdhury
Former CSO & Head
Farm Management Division BRRI, Gazipur-1701.

Abstract/ Executive Summary:

To study the effect of lopping on lodging, productivity and labor utilization for rice cultivation an experiment was conducted at BRRI Farm, Gazipur during T. Aman season 2001 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. BR22 and BRRI dhan32 had statistically similar effect on lodging tendency.

Keywords: Lopping, Lodging, Labour and Rice

Location: BRRI Farm, Gazipur

Start Date: 00-00-2001

End Date: 00-00-2001

Program Area: Socio-economic and Policy

Commodity: Rice

Objectives:

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

2.To reduce the lodging tendency through agro physiological manipulation of the studied rice variety.

Methodology:

This experiment was conducted at the West Byde of the BRRI Farm during T. Aman season 2001 in a Randomized Complete Block design (Factorial) with three replications. The unit plot size was 4m×2.5m and the planting spacing was 25 cm×20 cm. The treatments were 3 lopping viz. i) Control i.e., no lopping ii) lopping at 30 DAT and iii) lopping at 45 DAT; and 2 cultivars viz. i) BR 22 and ii) BRRI dhan32. 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). All other cultural operations like weeding, insect-pest and disease management was done as and when necessary. Yields and yield components data were collected at maturity of the crop. Time requirement (man-dayha^-1) for harvesting and threshing were recorded during the period of operation where, eight hours work for laborers was considered as one man-day. Collected data were analyzed by following a standard statistical procedure and the mean differences were adjusted by LSD method.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2001-2002

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 10000/-(Ten thousand)

Total Budget (Tk.) : 10000/-(Ten thousand)

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.

Knowledge Management: Report/Proceedings