| Effects of conservation cultivation measures on carbon nitrogen accumulation and yield of rotation broad bean |
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| DOI：10.7606/j.issn.1000-7601.2021.05.21 |
| Key Words: broad bean ridge tillage straw mulching carbon and nitrogen accumulation yield |
| Author Name | Affiliation | | CHENG Xin | College of Agronomy and Biotechnology,Southwest University， Key Laboratory of Eco\|environments in Three Gorges Reservoir Region， Ministry of Education， Engineering Research Center of South Upland, Chongqing 400716, China
Chongqing Institute of Quality and Standardization, Chongqing 400716, China | | DU Juan | College of Agronomy and Biotechnology,Southwest University， Key Laboratory of Eco\|environments in Three Gorges Reservoir Region， Ministry of Education， Engineering Research Center of South Upland, Chongqing 400716, China | | XIE Xiaoyu | College of Agronomy and Biotechnology,Southwest University， Key Laboratory of Eco\|environments in Three Gorges Reservoir Region， Ministry of Education， 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， Ministry of Education， 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， Ministry of Education， Engineering Research Center of South Upland, Chongqing 400716, China | | CHEN Jinfen | College of Agronomy and Biotechnology,Southwest University， Key Laboratory of Eco\|environments in Three Gorges Reservoir Region， Ministry of Education， Engineering Research Center of South Upland, Chongqing 400716, China | | WANG Longchang | College of Agronomy and Biotechnology,Southwest University， Key Laboratory of Eco\|environments in Three Gorges Reservoir Region， Ministry of Education， Engineering Research Center of South Upland, Chongqing 400716, China |
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| Abstract: |
| Broad bean (Vicia faba L) field under the broad bean/maize/sweet potato drought triple cropping mode with rotation broad bean of 7 a was taken as the research subject. The six treatments included conventional tillage(T), ridge tillage (R), convention tillage with half straw mulching(TS1), ridge tillage with half straw mulching(RS1), conventional tillage with whole straw mulching(TS2)and ridge tillage with whole straw mulching(RS2). The carbon and nitrogen content, carbon and nitrogen storage, and yield under different cultivation measures were investigated. The results showed that ridge planting and straw mulching both increased the carbon and nitrogen storage of broad bean when compared with the conventional tillage (T). Among different tillage modes，the amount of carbon and nitrogen storage per plant of broad bean was the highest in ridge planting plus straw mulching (RS2), which increased by 52.05% and 59.99%, respectively, compared with that of conventional tillage(T). The grain nitrogen content of single ridge (R) was 5.9% higher than that of TS2, and the grain nitrogen content of single ridge (T) was 10.25% higher than that of TS2. Dry matter accumulation per plant showed the trend of RS2>TS2>RS1>R>TS1>T. Furthermore, ridge cultivation and straw mulching both significantly increased the yield of broad bean, and the yield of RS2 treatment significantly increased 51.97% compared with T treatment. The average yield of broad bean was 2 619.15 kg·hm-2 under conservation tillage modes and the yield was positively correlated with agronomic character indexes. Considering all the indexes，RS2 had the optimum effects on increasing dry matter accumulation, carbon and nitrogen storage in different organs of broad bean among these cultivation modes, and thus improved the broad bean yield. |
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