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Agronomic responses of cotton to low soil oxygen during waterlogging

Thongbai, P., Milroy, S.ORCID: 0000-0002-3889-7058, Bange, M., Rapp, G. and Smith, T. (2001) Agronomic responses of cotton to low soil oxygen during waterlogging. In: 10th Agronomy Conference, 29 January - 1 February 2001, Hobart, Tasmania


The effect of waterlogging on growth, development and yield of cotton was quantified in a furrow irrigated field experiment conducted on a cracking clay. The experiment was a four replicated split plot design with two main plot treatments of normal irrigation (8 hrs running water) for the control (-WL) and 52-72 hrs running water for the waterlogging (+WL) plots. The sub plot treatments were factorial of two varieties and two ridge heights. Soil O2 decreased rapidly in the waterlogged treatment, which became anoxic within 48 hours of inundation. At 24 hrs after waterlogging, photosynthesis decreased by 30% relative to non-waterlogged plants, while reduction in the leaf greenness occurred slower and biomass production did not decrease until after the 3rd waterlogging event. Yield was not different between varieties, but waterlogging significantly lowered yield in the low ridge but not in the high ridge plots.

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