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Comparison of Weed Control Methods on Infestation and Crop Productivity in Transplant Aman Rice

MN Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

UK Sarker
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MR Uddin
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

AK Hasan
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MS Kaysar
Upazilla Agriculture Officer
Tarakanda, Mymensingh, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from June to December 2014 with a view to compare the efficacy of weeding method on the performance of transplanted aman rice varieties. Four transplanted aman rice varieties viz. Kalijira, BRRI dhan34, BRRI dhan52 and BRRI dhan64 and five different weeding treatments namely no weeding, two hand weeding at 20 & 40 days after transplanting (DAT), mechanical weeding by Japanese rice weeder at 20 and 40 DAT, soil applied pre-emergence herbicide Topstar 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha^-1 once at 3 days before transplanting and foliar applied post-emergence herbicide Manage @ 250g ha^-1 at 6 days after transplanting were evaluated. The experiment was laid out in a split plot design assigning weed control method in the main plot and variety in the sub plot with three replications. Weed population was significantly influenced by variety and methods of weeding. The important weeds of the experimental plots were Digitaria sanguinalis, Leersia hexandra, Paspalum scrobiculatum, Echinochloa crusgalli, Monochoria vaginalis, Ludwigia hyssopifolia, Polygonum orientale, Eclipta alba, Marsilea crenata and Fimbristylis miliacea. The effect of weeding treatments on dry weight of weeds was significant. Hand weeding at 20 and 40 DAT showed the lowest dry weight of weeds followed by post-emergence herbicide Manage at 6 DAT and no weeding produced the highest dry weight of weeds. Among the weeding treatments hand weeding at 20 and 40 DAT performed the best for all the crop characters including grain yield (3.90 t ha^-1 ) followed by the post-emergence herbicide manage and no weeding showed the lowest performance (3.06 t ha^-1 ). Among the varieties, BRRI dhan34 produced the highest grain yield (4.33 t ha^-1 ) and Kalijira yielded the lowest (2.04 t ha^-1 ). The interaction between variety and weeding show that all the varieties produced higher grain yield with two hand weeding at 20 and 40 DAT than other weeding treatments. The results suggested that BRRI dhan34 might be grown with two hand weeding at 20 and 40 DAT as well as early post-emergence herbicide Manage for effective in controlling weeds and for better yield of transplant aman rice.

Keywords: Weed control methods, Transplant, aman rice, Yield

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh-2202

Start Date: 00-06-2014

End Date: 00-12-2014

Program Area: Pest Management

Commodity: Weed management

Objectives:

To assess the weed control efficacy of different weed control techniques and to compare the crop productivity in transplant aman rice.

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh-2202 during the period from June to December 2014 with a view to compare the efficacy of method of weeding on the performance of transplant aman rice varieties. Four transplanted aman rice varieties viz. Kalijira (V₁₎, BRRI dhan34 (V₂₎, BRRI dhan52 (V₃₎ and BRRI dhan64 (V₎ and five different weeding treatments namely no weeding (W₁₎, two hand weeding at 20 and 40 DAT (W₂₎, mechanical weeding by Japanese rice weeder at 20 and 40 DAT (W₃), soil applied pre-emergence herbicide Topstar 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha^-1 once at 3 days before transplanting (W₄₎ and foliar applied post-emergence herbicide Manage @ 250g ha^-1at 6 days after transplanting (W₅₎were evaluated. The experiment was laid out in split plot design assigning weed control method in the main plot and variety in the sub plot with three replications. Twenty five days old seedlings were uprooted carefully from the nursery bed and transplanted on 18 July 2014 at the rate of three seedlings per hill, maintained row and hill distance of 25 cm and 15 cm, respectively. The experimental plots were fertilized with nitrogen, phosphorus, potassium, sulphur and zinc @ 220, 100, 60, 60 and 10 kg ha^-1 in the form of urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate respectively. Except urea, the whole amounts of other fertilizer were applied before final land preparation. Urea was top dressed in two installments at 20 and 40 DAT. Weeding was done as per the experimental treatments. Due to frequent rains during crop growth period, no irrigation was needed and excess water was drained out at the time of heavy rain. Observations were regularly made and the field looked nice with normal green plants. The crops were at full maturity harvested on 30 October 2014 (BRRI dhan64), 12 November 2014 (BRRI dhan34) and 20 November 2014 (Kalijira and BBRI dhan 52). Then the harvested crops of each plot except 5 hills plot^-1 was bundled separately, properly tagged and brought to threshing floor. The crops were then threshed and the fresh weights of grain and straw were recorded plot-wise. The grains were cleaned and finally the weight was adjusted to a moisture content of 14%. The straw was sun dried and the yields of grain and straw plot^-1 were recorded and converted to t ha^-1. The data of weed parameters were collected at 20 and 40 DAT of rice plants. Weed parameters such as weed species and total weed dry weight (g m^-2) were collected. Crop characters such as plant height, number of total tillers hill^-1, number of ear bearing tillers hill^-1, number of non-ear bearing tillers hill^-1, panicle length, number of grains panicle^-1, number of sterile spikelet panicle^-1, 1000-grain weight, grain yield, straw yield , biological yield and harvest index were recorded. Data were analyzed using the “Analysis of Variance” technique and mean differences were adjudged by Duncans’ Multiple Range Test (Gomez and Gomez, 1984).

Source of Information: Progressive Agriculture 27 (4): 418-427, 2016

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this study, it can be concluded that all weeding treatments showed their superiority over no weeding in the production of grain and straw yield. Among the weeding treatments, hand weeding at 20 and 40 DAT showed the best performance of all the crop characters including yield. So, for the control of weeds in effective manner and in order to get highest grain yield in transplanted aman rice, hand weeding at 20 and 40 DAT might be followed. In case of labor scarcity, post- emergence herbicide Manage @ 250 g ha^-1 at 6 DAT might also be followed to get highest grain yield in transplant aman rice.

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