Title: Pre- or post- rice soybean production with phosphorus fertilization under rainfed conditions
Abstract: The objective of the study was to investigate the response of three soybean cultivars to different phosphorus application rates, when the soybeans were grown before or after rice under rainfed conditions. Two experiments were conducted in farmers' fields in Khon Kaen Province in 2007-2008. A split- plot design with four replications was used. The three soybean cultivars were CM60, KKU74, and SJ5, assigned to the main plots. There were three levels of P fertilizer (0, 29, and 58 kg P2O5 ha-1), which were assigned to the subplots. The results showed that P fertilizer had a significant effect on grain yield of soybean. Phosphorus application at the rate of 58 kg P2O5 ha-1 gave the highest grain yield of soybean when grown before rice (365 kg ha-1) and after rice (757 kg ha-1). Phosphorus application increased the root length density, shoot dry weight per plant, leaf area index, number of pods per plant, and 100-seed weight. There were significant differences among cultivars for grain yield. The KKU74 cultivar had a higher grain yield than CM60 and SJ5 when grown either before or after the rice crop. This was due to the fact that KKU74 produced a higher root length density, and consequently had an increased number of seeds per pod and 100-seed weight. There was no significant interaction between phosphorus fertilizer rates and soybean cultivars on grain yield. Soybean grown after the rice crop showed a higher grain yield than soybean grown before the rice crop due to the fact that soybeans were not subjected to water deficit during their entire growing season, while the plants grown before rice suffered from waterlogging at reproductive stages, which resulted in decreased shoot and root growth and yield components.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 4
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