Influence of plant densities and flooding conditions on yield elaboration of rice
1993
Apakupakul, R. | Siriudompart, C. | Sebillote, M. (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Plant Science)
Study on yield elaboration process of wet-sown rice were conducted at Phatthalung Rice Research Centre in two wet seasons (1988-89). The experimental design was criss cross split plots with 2 replications. Plant densities ranged from 50-300 plants/square m, water levels of 10 and 50 cm and two rice varieties i.e. KAEN-JAN and RD7 were used as experimental factors. The results showed that the yield elaboration process can be essentially partitioned into 4 steps. Firstly, at the beginning of internode elongation, the aboveground dry matter per unit of surface area depends on stand number per unit of surface area. Secondly, the potential number of panicles of the RD7, which was not lodged, was correlated with the aboveground dry matter at the beginning of internode elongation in the form of a power function. Thirdly, the number of filled grains was determined by the number of panicles. Fourthly, at harvest, the weight of one grain in both varieties were constant when the number of grains/square m were less than 17,000 and 20,000 grains in KAEN-JAN and RD7, respectively. Beyond these limits the weight of one grain clearly decreased as the number of grains increased. This finding indicated an important approach in designing a tool for field diagnosis of rice production constraints and creating a fundamental means in crop modelling of rice.
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