| Effects of nitrogen reduction by drip irrigation on leaf senescence and matter accumulation of maize after silking in Sichuan Basin |
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| DOI：10.7606/j.issn.1000-7601.2023.03.23 |
| Key Words: maize drip irrigation leaf senescence carbon and nitrogen metabolism matter accumulation |
| Author Name | Affiliation | | LIU Fan | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | LIU Binxiang | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | GUO Zongxiang | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | CUI Shilei | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | LIU Ju | Agricultural and Rural Bureau of Zhongjiang County, Zhongjiang, Sichuan 618100, China | | YANG Yunfei | Agricultural and Rural Bureau of Zhongjiang County, Zhongjiang, Sichuan 618100, China | | LI Xiaolong | Agricultural and Rural Bureau of Zhongjiang County, Zhongjiang, Sichuan 618100, China | | KONG Fanlei | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | YUAN Jichao | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture and Rural Affairs/Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China |
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| Abstract: |
| The objective of this study was to examine the effects of nitrogen reduction and drip irrigation on leaf senescence, carbon and nitrogen metabolism and matter accumulation of maize after silking. Two levels of normal nitrogen (240 kg·hm-2, N240) and nitrogen 25% reduction (180 kg·hm-2, N180) and four different drip irrigation quantities (0 m3·hm-2, B0; 375 m3·hm-2, B1; 750 m3·hm-2, B2;1 125 m3·hm-2, B3) with non\|irrigation and non\|nitrogen application as control (CK) were set. A total of 9 treatments were designed to compare the differences of chlorophyll content, protective enzyme activity （superoxide dismutase, SOD; peroxidase, POD; catalase, CAT）, carbon and nitrogen metabolic enzyme activity (sucrose synthetase, SS; glutamine synthetase, GS) and matter accumulation of maize leaves after silking with drip irrigation under different nitrogen fertilizer levels. The results showed that the chlorophyll content, activities of protective enzymes, carbon and nitrogen metabolic enzymes and matter accumulation after silking increased with the increase of nitrogen application and drip irrigation, and there was a certain interaction between them. Compared with normal nitrogen treatment (N240B0), the average chlorophyll content, SOD, POD, CAT, SS and GS activities and post\|anthesis dry matter accumulation of 25% nitrogen reduction treatment (N180B0) decreased by 19.01%, 19.71%, 10.55%, 7.32%, 10.91%, 19.91% and 4.46%, respectively, but there was no significant difference between N180B3 and N240B0 with even higher than that of N240B0. Meanwhile, there was a certain synergistic and complementary effect between nitrogen fertilizer level and drip irrigation amount. This research demonstrated that the N180B3 treatment delayed leaf senescence, maintained strong carbon and nitrogen metabolism. The study provides a theoretical basis for integrated water and fertilizer nitrogen reduction technology for maize production in the Sichuan Basin. |
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