棉花灌水的生理指标

Physiological Indicators for Cotton Irrigation

In this article,the author briefly reviewed some physiological indi- cators used in cotton irrigation scheduling.These indicators include:leaf water potential,leaf water content,cell sap concentration and exudation rate,stomatal aperture and resistance to diffusion,cvapotranspiration rate,leaf temperature and its revised indices,such as stress-degreeday (SDD)and crop water stress index(CWSI),and stem diameter contr- action.Methods and implements used to measure the above indicators were also compared.It was proposed that further research should be di- rected to measure several indicators simultaneously on a large scale with meteorological adjustment,so as to reveal the effects of water stress on cotton growth and choose the best time to irrigate.