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Effect of Time of Tiller Separation on Grain Growth and Seed Yield of Transplant Aman Rice

M. A. Alim
Associate Professor
Department of Agronomy and Agricultural Extension, University of Rajshahi, Bangladesh

M. S. Sheuly
Post graduate student
Department of Agronomy and Agricultural Extension, University of Rajshahi, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out to study the effect of time of tiller separation on grain growth and yield of transplant aman rice. The experiment consisted of 3 times of tiller separation viz. tiller separation at 25 (T₁), 35 (T₂) and 45 (T₃) days after transplanting (DAT); and 5 levels of number of tillers kept hill^-1 viz. intact hills (K0), 1 tiller kept hill^-1 (K1), 2 tillers kept hill^-1 (K2), 3 tillers kept hill^-1 (K3) and 4 tillers kept hill^-1 (K4). The experiment was conducted in randomized complete block design with three replications. The unit plot size was 4 m 2.5 m. With a few exceptions, the highest grain growth parameters like number of panicles hill^-1, dry weight panicle^-1, number of grains panicle^-1, dry weight grain^-1 and grain growth rate were observed when tillers were separated at 25 DAT but the lowest values were found at 45 DAT. The grain growth rate decreased with the advance of time. The highest grain yield (5.25 t ha^-1) was obtained from tillers separated at 25 days after transplanting (DAT) but the lowest values (4.13 t ha^-1) were recorded when tillers were separated at 45 DAT. The maximum grain yield (5.88 t ha^-1) was found in intact hills, while the lowest values (2.64 t ha^-1) were obtained when 1 tiller kept hill^-1.

Keywords: Tiller separation; Number of tillers kept hill-1; Grain growth; Yield and transplant aman rice

Location: Agronomy Field Laboratory, University of Rajshahi

Start Date: 00-06-2008

End Date: 00-11-2008

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The present experiment was undertaken to observe the effect of time of tiller separation on the grain growth and yield performance of transplant aman rice.

Methodology:

The field experiment was conducted at the Agronomy Field Laboratory, University of Rajshahi from June to November 2008, with a view to find out the effect of time of tiller separation on the grain growth and yield performance of transplanted aman rice cv. BRRI dhan32. The experiment consisted of (factor A) 3 times of tiller separation viz. tiller separation at 25 (T₁), 35 (T₂) and 45 (T₃) days after transplanting (DAT); and (factor B) 5 levels of number of tillers kept hill^-1 viz. intact hills (K0), 1 tiller kept hill^-1 (K1), 2 tillers kept hill^-1 (K2), 3 tillers kept hill^-1 (K3) and 4 tillers kept hill^-1 (K4). The experiment was laid out in a randomized complete block design with three replications. The size of each unit plot was 10 m2 (4.0 m 2.5 m) and the space between replications and plots were 1.0 m and 0.5 m respectively. Total numbers of plots were 45 in the experiment. The experimental plots were fertilized with urea, triple superphosphate (T. S. P.), muriate of potash and gypsum at the rate of 150, 100, 70 and 60 kg ha^-1, respectively. The whole amount of triple super phosphate, muriate of potash, gypsum and 1/3 of urea were applied as basal dose at final land preparation. The rest 2/3 amount of urea was applied as top dressing in two equal splits. The first split was applied at 25 DAT and the second one at the active tillering stage at the 45 DAT. Forty days old seedlings were transplanted on 24th July, 2008 with three seedlings maintaining 20 cm 15 cm space between the lines and hills, respectively. Tiller separation was done at 25, 35 and 45 DAT by hand pulling keeping 1, 2, 3 and 4 tillers hill-1 as per treatment. Besides, there were intact hills from which no tiller was separated. Intercultural operations were done as and when necessary. Data were recorded on grain growth and grain yield characters. The data were analyzed statistically and adjudged the mean differences by Duncan`s New Multiple Range Test (DMRT) (Gomez and Gomez, 1984) with the help of computer package MSTAT-C.

Source of Information: J Sci Foundation, January-June 2012;10(1):12-19 ISSN 1728-7855

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results showed that there is significant differences in grain yield due to time of tiller separation. The highest grain yield (5.25 t ha^-1) was obtained when tillers were separated at 25 DAT while the lowest grain yield (4.13 t ha^-1) was obtained when tillers were separated at 45 DAT. When tiller separation was done at early stage i. e. 25 DAT then the crop were very young so they easily recovered their mechanical injury caused by separation and the crop received relatively more time for their growth, development and grain filling and thus the grain yield was increased. The results are in agreement with those of Khan (2008), Mollah et al (1992) and Patoary (2005), who also reported that tiller separation in late vegetative stage reduced grain yield. Number of tillers kept hill-1 had significant effect on grain yield. The results show that the highest grain yield (5.8 t ha^-1) was obtained from intact hills. On the other hand, the lowest grain yield (3.69 t ha^-1) was found when 1 tiller kept hill^-1. Improvement of yield components e.g. number of effective tillers hill^-1, and number of grains panicle^-1 were mainly responsible for the increased grain yield in intact hills.

Knowledge Management: Journal