Dynamics of leaf water potential of spring wheat and responses to environmental factors under different tillage practices on dry land

Abstract

Abstract: Based on a long-term experiment conducted in the Loess Plateau, the dynamics of leaf water potential of rain watered spring wheat, and the relationships between leaf water potential and environmental factors under different tillage patterns were studied. During the whole growing season, leaf water potential was highest in the early morning and lowest at 12:00 to 14:00, after which it gradually rose again. The daily average value of leaf water potential under no-till cultivation with straw mulching was higher than those under other treatments. The order of leaf relative water content at different growth stages was: heading>jointing>flowering>filling stage, and leaf relative water content under no-till with straw mulching was significantly higher than that under conventional tillage. The dynamics of water saturation deficient showed the opposite trends to that of relative water content. Leaf water potential under different conservation tillage patterns had significant correlations with soil water content, air temperature, solar radiation, relative air humidity and air water potential. Air water potential had the greatest effect on the dynamics of leaf water potential in these areas, followed by relative air humidity, air temperature and solar radiation.

CLC Number:

S512.1⁺2

LI Jie, CAI Li-qun, ZHANG Ming, ZHANG Ren-zhi. Dynamics of leaf water potential of spring wheat and responses to environmental factors under different tillage practices on dry land[J]. Acta Prataculturae Sinica, 2012, 21(6): 75-81.

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