Effects of Different Drip Irrigation System on Photosynthesis Characteristics and Water Use Efficiency of Winter Wheat

doi:10.7668/hbnxb.2013.05.027

Abstract

Abstract: The North China Plain ( NCP) is a major agricultural area in China,especially for wheat and corn production. However,crop yield in this area is often restricted by water shortage and uneven distribution of precipita-tion.Water-saving technique is one of the most important components in wheat cultivation system in this area. The purpose of this study was to optimize drip irrigation system for high photosynthesis and water use efficiency (WUE) in wheat. The field experiments was conducted with the cultivar of Qingmai 7 in the field at the agricultural experi-ment station of Qingdao agricultural university in Jiaozhou city (36°16'N,120°04'E),Qingdao,Shandong,China in 2011-2012 growing seasons. According to different drip irrigation amount and irrigation stage,we set seven treat-ments in the experiment,which were in turn:no drip irrigation(CK1),surface irrigation at over winter stage,raising stage,jointing stage and filling stage(CK2),drip irrigation at jointing stage(W1),drip irrigation at jointing stage and filling stage(W2),drip irrigation at jointing stage,anthesis stage and filling stage(W3),drip irrigation at rai-sing stage,jointing stage,anthesis stage and filling stage ( W4 ) and drip irrigation at raising stage,jointing stage,an-thesis stage,filling stage and medium-filling stage(W5),respectively.And each time the drip irrigation amount was 30 mm and the surface irrigation amount was 60 mm.The results of this experiment showed that,compared to the CK1 and CK2,drip irrigation treatments W4 and W5 significantly increased the SPAD value, photosynthesis rate, stomatal conductance and transportation rate of flag leaf. Besides,with the increase in drip irrigation water amount, the SPAD value,photosynthesis rate,stomatal conductance and transportation rate was in the order W 4>W5>W3 The North China Plain (NCP) is a major agricultural area in China,especially for wheat and corn production. However,crop yield in this area is often restricted by water shortage and uneven distribution of precipita-tion.Water-saving technique is one of the most important components in wheat cultivation system in this area. The purpose of this study was to optimize drip irrigation system for high photosynthesis and water use efficiency (WUE) in wheat. The field experiments was conducted with the cultivar of Qingmai 7 in the field at the agricultural experi-ment station of Qingdao agricultural university in Jiaozhou city (36°16'N,120°04'E),Qingdao,Shandong,China in 2011-2012 growing seasons. According to different drip irrigation amount and irrigation stage,we set seven treat-ments in the experiment,which were in turn:no drip irrigation(CK1),surface irrigation at over winter stage,raising stage,jointing stage and filling stage(CK2),drip irrigation at jointing stage(W1),drip irrigation at jointing stage and filling stage(W2),drip irrigation at jointing stage,anthesis stage and filling stage(W3),drip irrigation at rai-sing stage,jointing stage,anthesis stage and filling stage ( W4 ) and drip irrigation at raising stage,jointing stage,an-thesis stage,filling stage and medium-filling stage(W5),respectively.And each time the drip irrigation amount was 30 mm and the surface irrigation amount was 60 mm.The results of this experiment showed that,compared to the CK1 and CK2,drip irrigation treatments W4 and W5 significantly increased the SPAD value, photosynthesis rate, stomatal conductance and transportation rate of flag leaf. Besides,with the increase in drip irrigation water amount, the SPAD value,photosynthesis rate,stomatal conductance and transportation rate was in the order W 4>W5>W3>W2>W1 from 0 to 30 days after anthesis. The yield of all the treatments had significant difference and the result was W4>CK2>W5>W3>W2>W1>CK1 and the water use efficiency of W 4 was significantly the highest com-pared with other treatments.Under the conditions of semi-humid and arid regions,irrigated at raising,jointing,an-thesis and grain filling stages was the optimal drip irrigation system considering the grain yield,photosynthesis char-acteristic and the water use efficiency.

Key words: Winter wheat, Drip irrigation, Photosynthesis characteristic, Water use efficiency, Grain yield

CLC Number:

S512.11

WEI Guo-feng, LIU Yi-guo, JIANG Wen, ZHANG Hong-sheng, LIN Qi, ZHAO Chang-xing. Effects of Different Drip Irrigation System on Photosynthesis Characteristics and Water Use Efficiency of Winter Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(5): 149-156. doi: 10.7668/hbnxb.2013.05.027.

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