Interference of weedy rice on yield and yield components of cultivated rice under replacement series method
2019
Sandoval, F.R. | Martin, E.C. | Donayre, D.K.M.
Weedy rice are becoming a major threat to rice production in the Philippines. Reports had shown that it affect the quality and quantity of cultivated rice. Information about its negative effect on yield of rice under Philippine condition is very limited. An experiment was conducted from August-November 2018 at PhilRice CES [Philippine Rice Inst. Central Experiment Station, Science City of Munoz, Nueva Ecija, Philippines]to determine the effect of weedy rice on yield and yield component of cultivated rice using replacement series method. The treatments involved were 100:0, 75:25, 50:50, 25:75 and 0:100% rice:weedy rice or weedy rice:rice ratios. The experiment was arranged in RCBD [randomized complete block design] with 4 replications. Data were subjected to ANOVA replacement method analysis. Results showed that plant height of NSIC Rc 222 was not affected by the presence of weedy rice. However, number of leaves, tillers and panicles were significantly reduced at 50:50 and 25:75 rice to weedy rice ratio. Tillers and panicle number of weedy rice were higher at 75:25 ratio. When the population of weedy rice was lower, the number of tillers increased. Yield components of rice at 25:75 ratio were significantly reduced particularly the panicle length (24cm), total number of grains (107) and biomass (22.15g).
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