| Regulating effects of leaf source reduction on lodging resistance and yield of summer maize varieties in dense planting |
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| DOI：10.7606/j.issn.1000-7601.2022.05.15 |
| Key Words: leaf source reduction summer maize dense planting plant traits lodging resistance yield |
| Author Name | Affiliation | | XIAO Jinbao | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | WANG Haiqi | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | WANG Pei | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | YANG Shengfei | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | LIU Tiening | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | HAN Qingfang | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | JIA Zhikuan | College of Agronomy, Northwest A&F University, Institute of Water\|saving Agriculture in Arid Areas of China, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physi\|ecology and Tillage Science in Northwest Loess Plateau, Ministry of Agriculture, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A two\|factor split\|zone experiment was conducted in 2019 and 2020. The experiment involved different density\|tolerance maize cultivars (main plot) and leaf source reduction intensity (sub plot). The two maize cultivars were Zhengdan 958 (compact) and Zhengda 12 (semi\|compact). The leaf source reduction intensity including 1 leaf (D1), 2 leaves (D2), 3 leaves (D3) and 4 leaves (D4) of the plant were removed from top to bottom one week before flowering, and the treatment with no leaves removal was used as control (CK). The plant morphology, puncture strength and breaking force of the third internode at milk\|ripe stage and waxy\|ripe stage, grain yield components of maize were analyzed to explore the response of lodging resistance and grain yield to leaf source reduction. The results showed that the plant height, spike height, and spike coefficient were significantly lower by 1.03%、3.03%,2.29%、6.17% and 1.32%、4.17%, and the stem diameter and dry matter per stem length were increased by 4.15%、33.94% and 1.91%、5.72% in D1 and D2 treatments compared to CK at lactation. At the waxy\|ripe stage, the puncture strength and breaking force of Zhengdan 958 under the D2 treatment were 26.51% and 32.44% higher than CK, and that in Zhengda 12 were 55.28% and 21.53% higher. During the filling stage, the soluble sugars of Zhengdan 958 and Zhengda 12 increased by 2.91% and 10.83% respectively, and the lignin contents increased by 2.74% and 6.90% under the D2 treatment, compared with CK. The cellulose contents of the D3 and D4 treatments were decreased by 1.17% and 0.47%, 11.57% and 13.72% than CK, respectively. The total lodging rate of the D2 treatment was significantly decreased and the yield was the highest, Zhengdan 958 reached 11 203.90 kg·hm-2, Zhengda 12 reached 11 742.34 kg·hm-2. In summary, reducing leaf sources improved the lodging resistance of dense planting summer maize. There was leaf redundancy in the dense planting maize population. Therefore, moderate removal of the top 1~2 leaves optimized the plant architecture of summer maize, improved the lodging resistance by affecting stem diameter, allowing better distribution of dry matter, and finally increased the yield. |
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