EFFECT OF WEEDY RICE (Oryza sativa L.) ON THE YIELD OF CULTIVATED RICE (Oryza sativa L.) IN GREENHOUSE AND FIELD ENVIRONMENT by SALMAH BINTI
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Date
2014-08
Authors
TAJUDDIN, SALMAH
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Abstract
This study aimed to investigate the competitive abilities of cultivated rice (CR)
and weedy rice (WR). This study was performed over a period of twelve months
from January 2012 to December 2012 in greenhouse and field environments.
MR220, MR220 CL1, MR220 CL2, MR211, and Setanjung were the selected CR
varieties used in the greenhouse study. The field study was simultaneously conducted
using the same selected CR varieties as in the greenhouse study. However, only one
type of CR variety was planted in the field study because of time, space and labour
constraints. MR220 CL2 was selected because of its high yields and short maturity
period among all the CR varieties. Specific proportions of WR and CR were planted
in pots for the greenhouse study and plots for the field study based on additive series
and replacement series designs. The competitive abilities of CR varieties were
measured based on the Relative Growth Rate (RGR), Relative Yield, and linear
regression analysis under different infestation densities of WR. Results of additive
series and replacement series designs indicate that CR varieties were less competitive
than WR. Different CR varieties demonstrated various competitive abilities. The
presence of WR in CR decreased overall RGR, yield components, and yield. WR
significantly (P < 0.05) affected RGR, culm height, number of tiller, number of filled
grain, straw weight, 1000 grain weight, and yield of CR varieties. The new CR
variety (MR220 CL2) demonstrated high yield, but it was less competitive than WR
and other old rice varieties.
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Keywords
EFFECT OF WEEDY RICE (Oryza sativa L.) ON THE YIELD