Beushening VS Chemical Weed Control In Performance Of Rainfed Lowland Rice
Loading...
Date
1996
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Birsa Agricultural University, Ranchi
Abstract
In order to study busheling VS chemical weed Control in performance of lowland rice, an experiment was conducted in the Eastern Section of the Ranchi Agricultural College Farm, Kanke, Ranchi under rainfed lowland condition during the kharif season (July November, 1994). The expe riment was laidout in the randomised block design. The treatments included bushening at 25 DAS (Standard practice), 355 at 40 DAS (Common practice) and at 25 DAS alongwith 1 HW at 40 DAS, post emergence application of 2,4-D 0.75 and 1.5 kg aa/ha AS and papergence application of each and butachlor 2 kg ai/ha 20DAS each with and without 1 HW at 40 DAS, two hand-weedings at 25 and 40 DAS together with a weedy check. Thus, there were eleven treatments which were replicated thrice. The soil of the experimental plot was silt loam, low in fertility and slightly acidic in reaction.
Among the treatments, two hand-weedings (25 and 40 DAS) gave maximum grain yield. It was followed in decreasing order by that with butachlor 2 kg ai/ha 20DAS + 1 HW 40 DAS and 2,4-D 0.75 kg ae/ha 20 DAS. Among the other treatments bushening 25 DAS + 1 HW 40 DAS was found as effective as two hand-weedings.
Similarly, in increasing straw yield two hand weedings showed superiority over the remaining treatments. It was followed in decreasing order by that with butachlor 2 kg ai/ha 20 DAS 1 HW 40 DAS, 2,4-D 0.75 kg ae/ha 20 DAS 1 HW 40 DAS, butachlor 2 kg ai/ha 20DAS, 2,4-D 0.75 kg ae/ha 20 DAS and bushening 40 DAS (Common practice). However, among the other treatments only bushening 25 DAS + 1 HW 40 DAS was found equally effective with two hand-weed ings (25 and 40 DAS) in increasing straw yield.
So far net return is concerned butachlor 2 kg ai/ha 20 DAS 1 HW 40 DAS was found as good as bushening 25 DAS + 1 HW 40 DAS and two hand-weedings (25 and 40 DAS) and the return hereunder was significantly higher than that with the remaining treatments. However, when the returns were compared at with and without one hand-weeding at 40 DAS, it was found that whether it was bushening or chemical measures, association of one hand-weeding at 40 DAS gave more returns than without its association.
However, when benefit/cost ratio was calculated, buta chlor e 2 kg ai/ha 20 DAS + 1 HW 40 DAS, 2,4-D 0.75 kg ae/ha 20 DAS 1 HW 40 DAS, butachlor 2 kg ai/ha 20DAS bushening 25 DAS (Standard practice) + 1 HW 40 DAS, 2,4-D 1.5 kg ae/ha 20 DAS 1 HW 40 DAS and 2,4-D 0.75 kg ae/ha 20 DAS dis played higher ratio as compared to two hand-weedings (25 and 40 DAS) but compared to weedy check all the measures gave greater ratio.
The above results clearly indicate that under the above soil and fertility condition treatments like bushening 25 DAS 1 HW 40 DAS and butachlor 2 kg ai/ha 20DAS + 1 HW 40 DAS should be adopted from productivity as well as profitability point of view. Moreover, this is the result of a single year and hence, for the confirmation of the result, the investigation needs to be repeated.