Soil Water and the Growth of Grasses: I. The Interaction of Water-Table Depth and Irrigation amount on the Growth of Agrostis Tenuis and Alopecurus Pratensis

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Abstract
The two grasses were grown in large, soil-filled tanks permitting full root development. Three irrigation treatments were factorially combined with 2 water table depths and with a treatment with no watertable. The irrigation treatments were High, to maintian field capacity; Medium and Low, equivalent to an average and a dry summer''s precipitation in S. E. England. The water table depths were 20 and 60 cm. Records of moisture tension profiles were taken from tensiometers and plaster resistance blocks. The 20 cm water table established reducing conditions in the soil of the rooting zone and reduced shoot yield. Low irrigation without water table caused high soil moisture tensions (>10 atmospheres) and reduced shoot yield by 50%. Medium irrigation with no water table and low irrigation with 60 cm. water table caused lower soil moisture tensions and smaller yield reductions. There was little evidence for an interaction of treatment with species.

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