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Determination of Yield Loss and Economic Threshold Density of Scirpus Maritimus in Winter Rice

Abdullah Al Mamun,
Former SSO,
Agronomy Division, BRRI, Gazipur.

A J Mridha
CSO & Head
Agronomy Division,BRRI, Gazipur

Rakiba Shultana
SSO
Agronomy Division,BRRI, Gazipur

Abstract/ Executive Summary:

In this study, it was observed that the weed infestation levels of 80 or more S. maritimus plants per m² offered higher competition, leading to significant reductions in the growth (dry weight, height, crop growth rate, net assimilation rate and leaf area index) and yield of rice. The regression model was effective in simulating yield losses in relation to a wide range of S. maritimus dry matter. The weed dry matter–crop yield model was found to be effective in simulating rice yield losses in relation to a wide range of S. maritimus dry matter. The ET dry matter of S. maritimus were 18.39, 15.61 and 13.57g m^-2 (4, 3 and 3 S. maritimus number m^-2, respectively) in first year at the 70, 80, and 90% control efficiencies, respectively, of the herbicide, Bensulfuron-methyl + Pretilachlor 6.6% GR. In the second year, the ET dry matter of S. maritimus were 15.06, 12.38 and 10.51 g m^-2 (3, 3 and 2 S. maritimus number m^-2, respectively) at the 70, 80, and 90% control efficiencies, respectively, of the herbicide. In rice cultivation, 10 to 18 g S. maritimus m^-2 (2 to 4 number m^-2) could be allowed without economic yield loss.

Keywords: Economic threshold, Scirpus maritimus, Rice, Bensulfuron-methyl + pretilachlor 6.6% GR, Weeds

Location: BRRI Gazipur

Start Date: 15-11-2010

End Date: 15-11-2011

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To estimate the interference effects of different densities of S. maritimus on the growth and yield of rice and to determine the ET of S. maritimus in winter rice.

Methodology:

Two field experiments were conducted at research farm of Bangladesh Rice Research Institute, Gazipur during Boro season in 2010 and 2011. The experiment was laid out in a Randomized complete block design (RCBD). Net plot size was 1m x 1m. Rice variety BRRI dhan29 was used as a test crop. The treatments consisted of 5, 10, 20, 40, 80 and 160 of S. maritimus plants per m² as compared with weedy and weed-free check treatments. Fertilizers such as nitrogen, phosphorus and potassium (N, P, and K) and sulphur (S) were applied at 120, 20, 50 and 10 kg/ha, respectively. The whole phosphorus and potassium and one third of nitrogen were applied at the time of sowing. The remaining doses of nitrogen were applied in two splits at tillering and panicle initiation, respectively. The crop was harvested at maturity. The data were analyzed following analysis of variance (ANOVA) and the statistical program MSTAT-C (Russell, 1986). Regression model was simulating with yield losses and dry matter of S. maritimus. Economic threshold density was determined using equation according to Gill and Vijayakumar (1969).

Source of Information: Academia Journal of Agricultural Research 1(11): 211-219, November 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget: twenty thousands taka

Total Budget (Tk.) : twenty thousands taka

Achievement/Findings:

Scirpus maritimus infests rice heavily, causing enormous yield losses and threatening in the sustainability of the rice production system. Information on the interference and economic threshold (ET) of S. maritimus will be useful for the effective management of S. maritimus in rice. This will lead to the rationalization of herbicide use and the reduction of herbicide input into the environment.

Knowledge Management: Journal