Impact of Micro-sprinkler Irrigation on Diurnal Variation of Microenvironment of Canopy of Winter Wheat and Their Leaf Water Potential
YANG Doudou
ZHANG Daijing
WANG Yanjie
LIU Xueqing
LIU Anqi
CHEN Qianqing
LI Chunxi
Abstract：This paper investigated the impact of micro-sprinkler irrigation on diurnal change in microenvironment of winter wheat canopy, their leaf water potential and yield using split-plot experiment. We used the cultivar Ai-kang58 as the model plant. The results showed that irrigating 10 mm of water at late grain-filling stage could signif-icantly reduce the temperature and carbon dioxide concentration of the canopy, whereas increasing the relative hu-midity and leaf water potential of the canopy. The treatment of drip-irrigating at sowing, jointing and flowering stages, together with a further 10 mm of irrigation at late filling stage, gave the highest yield (6952.39 kg/hm2) and 1000-grain weight (45.44 g), which were significantly higher than those in other treatments. Analysis showed that the yield was negatively related to canopy temperature (P<0.01), while positively related to leaf water potential (P<0.01) and relative humidity of the canopy (P<0.05). Therefore, drip irrigation at sowing, jointing and anthesis stages with further 10 mm of irrigation at late grain-filling stage could optimize the canopy microenvironment and alleviate thermal stress, significantly increasing yield and grain weight as a result.
Keywords：winter wheatcanopy microenvironmentleaf water potentialyield
Publication Date：2017-06-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 13-17 )