| Effects of straw and milk vetch mulching and returning to the field on maize photosynthetic physiological characteristics |
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| DOI：10.7606/j.issn.1000-7601.2021.06.14 |
| Key Words: straw mulch milk vetch mulch photosynthetic characters photosynthetic enzyme maize dry matter |
| Author Name | Affiliation | | CHENG Xin | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China
Chongqing Institute of Quality and Standardization, Chongqing 400023, China | | WANG Yifan | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China | | LIU Bangyan | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China | | DAI Yisha | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China | | HE Xian | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China | | LIAO Hongbo | Chongqing Institute of Quality and Standardization, Chongqing 400023, China | | WU Haiyan | Agriculture Committee of Yunyang, Chongqing 404500,China | | WU Jinhong | Agriculture Committee of Yunyang, Chongqing 404500,China | | LI Qian | Agriculture Committee of Yunyang, Chongqing 404500,China | | WANG Longchang | College of Agronomy and Biotechnology, Southwest University Key Laboratory of Eco\|environments in Three Gorges Reservoir Region/Engineering Research center of South Upland, Chongqing 400716, China |
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| Abstract: |
| To explore the effects of corn straw and milk vetch mulching and returning to the field on photosynthetic physiological characteristics of maize,six treatments were set through field experiments,including half straw mulch (HS), full straw mulch(WS), milk vetch mulch(M), half straw with milk vetch mulch (HS+M), whole straw with milk vetch mulch (WS+M), and no mulch (CK).Diurnal variation of photosynthetic gas exchange parameters, light response curve, leaf physiological indexes and dry matter weight were measured at milking stage of maize.The results showed that Pn and Gs show a “bimodal” curve variation, while Ci and Tr showed a “unimodal” curve variation.The average daily Pn, Gs and Tr of HS+M were the highest and significantly increased by 33.44%, 60.81% and 33.36% when compared with CK, respectively.The average daily Ci among different treatments was not significantly different.For the light response curves, the measured values of Pnmax and LSP of WS+M were the highest among all treatments, which were 23.46、1 900 mol·m-2·s-1,respectively. The fitting determination coefficients of light response curves were all higher than 0.99.The activities of Rubisco and PEPC in all treatments were as follows: WS+M>HS+M>M>WS>HS>CK. Among all the treatments, the highest activity of Rubisco and PEPC in WS+M treatment were 12.92 U·L-1 and 6.59 U·L-1, respectively, which were 1.12 and 1.59 times higher than that of CK.WS+M had the highest ear leaf area and dry matter of per plant, which were significantly increased by 16.40% and 46.32% respectively when compared with CK.There was a positive correlation between gas exchange parameters and physiological indexes of maize leaf.In summary, the straw and milk vetch mulching improved the photosynthetic capacity and promote the dry matter accumulation of aboveground part of maize, and thus increasedthe maize yield. |
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