Crop development and microclimate in wetland rice
1986
Caranguian, L.M.
Three different climatic environments to which rice was exposed were evaluated and the corresponding effects they gave rise to on crop growth and development. Considering climate as the only limiting factor to crop growth and development, diurnal temperature of 27.2, 28.51, and 28.70C, and an average solar radiation of 18.01, 18.21, and 17.96 MJ/sq.m/day resulted to an overall growth duration of 114, 117, and 124 days from seeding to harvesting for crops 1, 2, and 3, respectively. The "Accumulative Temperature Units" or "Degree Day" concept was found applicable to assess temperature's influence on growth1830 duration. With this concept, growth durations decreased with temperature at a range of 20-29, 20-30, and 27-28C during the vegetative, reproductive and ripening stages, respectively. Rice was the most critical to minimum temperature below 20C during tillering. During the vegetative stage, solar radiation negatively correlated with yield and dry matter production, but this had positive effects during the reproductive and ripening stages. Rice performed best in terms of its grain yield and yield components at an accumulated solar radiation of 979 MJ/sq.m during the reproductive and ripening stages, and at an average diurnal temperature of 28
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