HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Anaya, M. G. Articles by Stolzy, L. H. Search for Related Content PubMed Articles by Anaya, M. G. Articles by Stolzy, L. H. Agricola Articles by Anaya, M. G. Articles by Stolzy, L. H.

Wheat Response to Different Soil Water-Aeration Conditions¹

ABSTRACT

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%.

¹ Contribution from Dep. of Soil Sci. and Agr. Eng. Univ. of California, Riverside 92502. Supported in part by Rockefeller Foundation Grant AGR-6970 and NSF Grant GB-19916. Presented before Div. S-6, Soil Science Society of America, Aug. 26, 1970 at Tucson, Ariz.

² Graduate Student, and Professor of Soil Physics, respectively.

Received for publication April 27, 1971. Accepted for publication January 3, 1971.