Simulation and assessment of planting date and climatic effects on Soybean (Glycine max L.) yields in Thailand using GLYCIM
Keywords:
Crop model, Tropics, Climate, Soil, GLYCIMAbstract
The soybean model GLYCIM was used to assess soybean yield potential as a function of planting date, soil type and cultivar for growing conditions in northeastern Thailand. A study was conducted at the Asian Institute of Technology (AIT), Pathumthani, Thailand in 2005 to calibrate and validate GLYCIM for Thailand conditions. The study used three planting dates and three cultivars commonly used in Thailand, CM-2, CM-60 and SJ-5. The model validation results indicated a good agreement between simulated and observed data for phenology, growth and yield of soybean, and demonstrated the potential of the model for assessment purposes. Simulations were carried out to determine yield ariations due to seven planting dates, three soil types and three cultivars using 37 years of measured weather data for two locations, Sukhothai and Khonkaen in the northern part of Thailand. Delayed (middle of June to end of June) planting showed a reduction in yield potential ranging from 7% to 35% due to a shorter growing season and increased water stress. The clay and silt loam soils showed higher yield potential compared to the sandy loam soil. There were no differences among the three cultivars and no significant interaction of cultivar with planting date or soil .Downloads
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