Subirrigation and fertilization of bentgrass during prolonged heat stress1
- J.V. Krans and
- G.V. Johnson
A field lysimeter study was conducted to evaluate the merits of sub irrigation for the maintenance of creeping bentgrass (Agrostis palustris Huds.) during a 3-month period of heat stress. Clipping yields and chlorophyll content decreased sharply during acute heat stress (35 to 40 C) early in the summer. Reduction in clipping yields was greater for turf grown in a mixture of sand and soil than in washed mortar sand alone. Yields for sprinkler irrigation (SI) and subirrigation from a fluctuating water table (FWT) were similar and significantly higher than for subirrigation from a stable water table at 30 cm. Significantly lesser chlorophyll content in sub irrigated turf may be associated with anaerobic conditions and apparent denitrification. Root penetration of sand was not affected by irrigation treatment but was significantly deeper in the subirrigated (35-cm) than SI (20-cm) mix. Wilting was observed only on sprinkler irrigated plots. Consumptive water use was measured for 1 year. Additional index words: Lysimeter, Heat stress, Clipping yields, Chlorophyll content, Soil mixture, Sprinkler irrigation, Water table, Anaerobic conditions, Denitrification, Root penetration, Wilting.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1974. . Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA