ISHS Acta Horticulturae 335: International Symposium on Irrigation of Horticultural Crops
CANOPY TEMPERATURE CONTROLLED IRRIGATION |
| Authors: | D.F. Wanjura, D.R. Upchurch, J.R. Mahan |
| Abstract:
A dependable irrigation scheduling procedure is needed to achieve the potential benefit of correct water management with drip and sprinkler irrigation systems. A threshold temperature method for controlling drip irrigation scheduling of cotton was evaluated using 2 °C increments between 26 °C and 32 °C. Threshold temperatures ≥ 28 °C restricted water application and caused higher levels of water stress. Maximum yields were produced by 28 °C and 30 °C threshold canopy temperatures. By selecting different threshold temperatures drip irrigation can be controlled to apply different amounts of water. Canopy temperatures of well-watered cotton, tomato, and bell pepper were similar in a 1990 comparison. The threshold temperature method was adapted to schedule irrigation of a sprinkler system in 1991 by using a minimum 3-day irrigation cycle which was modified by temperature-time thresholds. Average irrigation cycle length increased linearly as threshold time increased. Threshold canopy temperature controlled irrigation scheduling was tested on cotton but the concept is applicable to other crops. | |
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