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Critical Period of Weed Competition in Transplant Aus Rice Cv. BRRI Dhan27 Under Non-saline Agro-ecosystem

M. T. Rahman
Department of Agronomy, Patuakhali Science and Technology University, Patuakhali , Bangladesh

S. Ahmed
Department of Agronomy, Patuakhali Science and Technology University, Patuakhali, Bangladesh

N. J. Lipi
Department of Agronomy, Patuakhali Science and Technology University, Patuakhali , Bangladesh

M. H. Rashid
Department of Agronomy, Patuakhali Science and Technology University, Patuakhali , Bangladesh

M. I. Hoque
Department of Environmental Science, Bangladesh Agricultural University, Mymensingh , Bangladesh

Abstract/ Executive Summary:

A study was conducted to determine the critical period of weed competition in transplant Aus rice for var. BRRI dhan27. Among the treatments, weed free condition , competition of weed for first 10, 20, 30, 40, 50, 60 and 70 days and weed free later on, un weeded condition, one weeding at 20 days after transplanting and one weeding at 40 days after transplanting, the unweeded control plots showed the poor performance result in case of maximum parameters where grain yield was reduced the highest percentage (38.54%). On the basis of cost benefit ratio it was observed that the critical period of crop weed competition extended up to 30 days after transplanting of Aus var. BRRI dhan27.

Keywords: Critical period, Weed competition , Transplant Aus, BRRI dhan27

Location: Patuakhali Science and Technology University, Patuakhali

Start Date: 00-04-2012

End Date: 00-08-2012

Program Area: Pest Management

Commodity: Rice

Objectives:

To find out the critical period of weed competition in transplant Aus rice cv. BRRI dhan27.

Methodology:

The study was conducted at the field Laboratory of the Department of Agronomy, Patuakhali Science and Technology University, Patuakhali during the period of April to August 2012. The experiment was laid out in a randomized complete block design with three replications and eleven treatments as: T₁ = Weed free condition, T₂ = Competition of weed for first 10 days and weed free later on, T₃ = Competition of weed for first 20 days and weed free later on, T₄ = Competition of weed for first 30 days and weed free later on, T₅ = Competition of weed for first 40 days and weed free later on, T₆ = Competition of weed for first 50 days and weed free later on, T₇ = Competition of weed for first 60 days and weed free later on, T₈ = Competition of weed for first 70 days and weed free later on, T₉ = Unweeded condition, T₁₀ = One weeding at 20 days after transplanting (DAT) and T₁₁ =One weeding at 40 DAT. The sprouted seeds were sown in the prepared seed beds on 5^th April, 2012. The seedlings were transplanted in the main field@ 2 seedlings hill^-1 with 20 cm x 15 cm spacing on 30^th April, 2012. Fertilizers were applied @ 168 g Urea, 60 g TSP, 30 g MoP, 17 g Gypsum and 5 g ZnSo₄ to the plots. The whole amount of fertilizers except N was applied before final land preparation. Urea was top dressed @ 56 g in three equal splits at 15, 30 and 45 days after transplanting. Number of weed plant of each species in the unit plot was counted with the help of a plant counter. The intensity of infestation of each species of weed was calculated as the number of weed stands per unit area divided by the number of hills per unit area. After drying weeds weight of each sample was measured and expressed in g m^-2. The crop of all plots was harvested on 3 July 2012. Crop and yield contributing were also recorded.

Source of Information: Bangladesh Agron. J. 2014, 17(1): 95-102

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest (498. 30) number of weeds were found in the plots which were kept unweeded (Tg) and the lowest (288. 70) was found in T₁₁ (One weeding at 40 DAT .The plots in which first weeding were done after 40, 50, 60 and 70 days after transplanting and unweeded throughout the cropping period gave lower number of total tillers than others .Grain yield of T. Aus rice cv. BRRI dhan27 was significantly affected by the treatments of weeding. The plots which were kept weed free from transplanting to harvesting gave the highest (3.97 t ha^{- 1}) grain yield and it was followed (3.94 t ha^-l) by T₂ .The unwedded plots gave the lowest (2.44 t ha^-1) yield and it was followed by treatments . When weed infestation is increased , the rice plants deprive from nutrient and other environmental components. As a result, the long time weed infested plot showed lower performance than short time weed infestation.The result obtained from the study showed that the percentage of grain yield reduction with the increasing of crop weed competition was negligible up to 30 days competition. So, crop weed competition for first 30 days could be a critical period in transplant Aus rice cv. BRRI dhan27.

Knowledge Management: Journal