Wheat Response to Different Soil Water-Aeration Conditions
1972
Anaya, M. G. | Stolzy, L. H.
A graphical yield surface was constructed for wheat (Triticum aestivum L.) grown on Yolo silt loam with 13 different soil water-aeration combinations. The experiment was conducted in a growth chamber under controlled environmental conditions. Oxygen over the soil surface was maintained at different percent O₂ concentrations from 0.9 to 21%. Various soil water regimes were obtained by irrigation at different soil suctions from 8 to 99 centibars (cbars). The highest grain yields were obtained in two treatments, one of 9.6% O₂ watered at a soil suction of 15 cbars, and another treatment of 4.3% watered at 8 cbars. The lowest production was in the treatment of 0.9% O₂ weatered at 99 cbars, and the difference between the highest and lowest yields was 347%. From the data, the regression equation for grain yield was: Y = 15.94 − 0.1324 X₁ + 3.1813 X₂ − 0.1297 X₂², where Y = grain yield in g/pot, X₁ = soil suction in cbars, and X₂ = percent O₂. The maximum predicted yield calculated from the equation is at a level of 12.0% of O₂ irrigated at a soil suction of 8 cbars. However, the maximum production recorded was obtained at 9.6% O₂. There was a high correlation coefficient (0.94) between water consumption and grain production. An inverse relationship existed between grain yield and protein content. The highest level of grain protein content (22.6%) was obtained in the lowest producing treatment, while the lowest level of grain protein content (16.5%) occurred in the highest producing treatment. The difference in grain protein content between treatments was 37%.
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