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Integrated Weed Management in Potato at Munshigonj

A.S.A. KHAN
Agronomy Division, BARI, Joydebpur

M.A. HOSSAIN
Agronomy Division, BARI, Joydebpur

A.A. MAHMUD
Tuber Crops Research Sub-station, BARI, Munshiganonj

M.I.A. HOWLADER
On-Farm Research Division, BARI, Patuakhali, Bangladesh.

M.A. RAHMAN
Agronomy Division, BARI, Joydebpur

Abstract/ Executive Summary:

A field experiment was carried out at the research farm of Tuber Crops Research Sub-station, Munshigonj of Bangladesh Agricultural Research Institute (BARI) during rabi seasons of 2005-06 and 2006-07 to find out the effective and economical integrated weed control method in potato. Chenopodium album and Amaranthus viridis were the major weed species in potato field. Mulch (water hyacinth) along with herbicide application (Ronstar 25 EC @ 1 ml/L water) at 7 days after planting (DAP) was found most effective in controlling weed population (94 to 95%) upto 30 days of planting than that employed by only mulch (45 to 53%). The weeds were found to reduce tuber yield to the extent of 43 percent. Mulching plus herbicide spraying at 7 DAP followed by one time uprooting of weeds by hand at 25 DAP produced the highest tuber yield of 23.39 t/ha in 2005-06 and 29.58 t/ha in 2006-07 and it was most effective in controlling weeds as compared to unweeded and mulched plots. The highest net returns (Tk. 116141/ha in 2005-06 and Tk. 205646/ha in 2006-07) and maximum benefit cost ratio of 2.64 and 3.28 were noted with mulching by water hyacinth + herbicide application at 7 DAP + one time weed uprooting by hand at 25 DAP.

Keywords: Weed management, Mulching, Herbicide, Potato tuber yield.

Location: Research farm of Tuber Crops Research Sub-station, Munshigonj of Bangladesh Agricultural Research Institute (BARI)

Start Date: 00-00-2005

End Date: 00-00-2007

Program Area: Pest Management

Commodity: Potato

Objectives:

the present study was undertaken to find out an effective and economic weed control method in potato cultivation.

Methodology:

The experiment was conducted at the research farm of Tuber Crops Research Sub-station, Munshigonj of Bangladesh Agricultural Research Institute (BARI) during rabi seasons of 2005-06 and 2006-07, respectively. The land type was medium high and the Soil was silty clay in texture, which belongs to old Meghna Estuarine Floodplain soil (AEZ-19). Seven weed management practices including one untreated control were used as treatment variables. The treatments were Untreated control (weedy check)- T1, Mulching by water hyacinth- T2, Mulching + one time weed uprooting by hand at 25 and 45 DAP- T4, Mulching + herbicide (Ronstar 25 EC @ 1ml/L water) spray at 7 DAP as post planting post emergence weed control- T5, Mulching + herbicide (Ronstar 25 EC @ 1ml/L water) spray at 7 DAP + weed uprooting at 25 DAP- T6, Weed free (weeding was done manually at 20, 40, 60 and 80 DAP)-T7,. The experiment was laid out in a randomized complete block design with three replications. The unit plot size was 4m × 3m. The potato variety Diamant was used as the test crop. The potato whole tubers were planted on 27 November in 2005 and 23 November in 2006 at a spacing of 60cm × 25cm. The crop was fertilized with 150-43-140-22 kg NPKS/ha (FRG, 2005). During the final land preparation, full dose of P, K, S and 50% N were applied as basal. Remaining N was applied at 30 days after planting as side dressed. Herbicide was applied at 7 DAP through Knapsack sprayer using 100 liter water/ha. Irrigation was applied two times each at 30 and 55 DAP only in furrows. Admire 20 EC was sprayed @ 1ml/L of water at 25 and 50 DAP to prevent insect pests. Dithane M-45 @ 2g/L of water was sprayed at 45 and 60 DAP as preventive measure of diseases. No rainfall was occurred in 2005-06, but crop received 50 mm rainfall in 2006-07. Data on weed population was recorded at 30 DAP from a quadrate of 0.5m placed randomly at 2 places in each plot and their biomass were taken at 90 DAP. Weed control efficiency (WCE) was calculated by using the formula: WCE = (weed biomass in unweeded control − weed biomass in managed treatment)/ weed biomass in unweeded control × 100. Data on weed density and weed biomass were transformed by square root transformation method before conducting analysis variance. Cost benefit analysis was done according to prevailing market price.

Source of Information: Bangladesh J. Agril. Res. 33(3): 647-654, December 2008 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on two years findings, mulching (water hyacinth) with herbicide application (Ronstar 25 EC @ 1ml/L water) at 7 days after planting as post emergence weed control followed by one time uprooting of weeds by hand at 25 days after transplanting would be economically profitable for obtaining maximum tuber yield of potato in Munshigonj area. Though, mulching yield, this treatment was not economically profitable for potato cultivation in Munshigonj area. Therefore, any generalization of the findings, this sort of the study should be conducted covering wider areas of the country.

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