| Estimation of photosynthetic characteristics, leaf senescence and optimal irrigation amount for spring maize by drip irrigation under controlled soil moisture and supplementary irrigation |
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| DOI：10.7606/j.issn.1000-7601.2017.06.03 |
| Key Words: maize controlled soil moisture and supplementary irrigation drip irrigation photosynthetic characteristics leaf senescence yield water use efficiency |
| Author Name | Affiliation | | WANG Guo-dong | Institute of Farmland Water Conservancy and Soil -fertilizer, Xinjiang Academy of Agricultural Reclamation Science, Shihezi, Xinjiang 832000, China
Experimental Station for Crop Water Use of Ministry of Agriculture, Shihezi, Xinjiang 832000, China | | ZENG Sheng-he | Institute of Farmland Water Conservancy and Soil -fertilizer, Xinjiang Academy of Agricultural Reclamation Science, Shihezi, Xinjiang 832000, China
Experimental Station for Crop Water Use of Ministry of Agriculture, Shihezi, Xinjiang 832000, China | | CHEN Yun | Institute of Farmland Water Conservancy and Soil -fertilizer, Xinjiang Academy of Agricultural Reclamation Science, Shihezi, Xinjiang 832000, China | | LIANG Fei | Institute of Farmland Water Conservancy and Soil -fertilizer, Xinjiang Academy of Agricultural Reclamation Science, Shihezi, Xinjiang 832000, China | | ZHANG Lei | Institute of Farmland Water Conservancy and Soil -fertilizer, Xinjiang Academy of Agricultural Reclamation Science, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| A maize variety of the Zhengdan 958 was planted in Shihezi of Xinjiang, to carry out a field experiment during 2014 to 2015 which set up five cultivated model with controlled soil moisture and supplementary irrigation. The influences of the lower limitation of controlled soil moisture to the photosynthetic characteristics, leaf senescence and water use efficiency of spring maize by drip irrigation in oasis region were researched, and estimated the optimal irrigation amount for high yield maize cultivation. The test results showed that: If the soil moisture too lower or too higher (P<0.05) in the flare opening, tassel and silking periods, the plant height, leaf area index (LAI) and dry matter accumulation will be significantly reduced. The cultivated model of the soil moisture was kept 85% field capacity in filling stage, the net photosynthetic rate (Pn) of ear and leaf, actual photochemical efficiency(ΦPSⅡ), photochemical quenching(qP) and photosynthetic electron transport rate (rETR) can be increased by 71.7%, 81.8%, 71.6% and 54.9% respectively, compared with 70% field capacity. But the water use efficiency (WUEL) of single leaf will be decreased. Meanwhile, the photosynthetic yield and its contribution rate to grain in post-anthesis will be increased by 105.2% and 20.3%, respectively, and the leaf senescence duration was delayed about 8.1 days. The fitting result by quadratic curve showed that when the optimal irrigation amount was 539.9 mm, the high yield of 14.9×103 kg·hm-2 can be obtained, the maximal yield and irrigation benefit can be taken into account simultaneously. |
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