| This article has been：Browse 1568Times Download 0Times |
|
|
|
| DOI： |
|
| 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
|
|
College of Life Science, Henan Normal University, Xinxiang 453000, China
|
| 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 Aikang58 as the model plant. The results showed that irrigating 10 mm of water at late grain-filling stage could significantly reduce the temperature and carbon dioxide concentration of the canopy, whereas increasing the relative humidity 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 (6 952.39 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. |
| Key words: winter wheat; canopy microenvironment; leaf water potential; yield |
|
|
