| Effects of straw return on soil carbon and nitrogen components and crop yield under long\|term wheat\|soybean rotation |
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| DOI：10.7606/j.issn.1000-7601.2022.05.21 |
| Key Words: straw retention wheat\|soybean rotation soil carbon and nitrogen components yield |
| Author Name | Affiliation | | KONG Dejie | Agricultural Biotechnology Research Center, Ningxia Academy of Agriculture andForestry Sciences, Yinchuan, Ningxia 750002, China
College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Engineering Research Center of Circular Agriculture, Yangling, Shaanxi 712100, China | | ZHU Jinxia | Agricultural Biotechnology Research Center, Ningxia Academy of Agriculture andForestry Sciences, Yinchuan, Ningxia 750002, China | | REN Chengjie | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Engineering Research Center of Circular Agriculture, Yangling, Shaanxi 712100, China | | REN Guangxin | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Engineering Research Center of Circular Agriculture, Yangling, Shaanxi 712100, China | | FENG Yongzhong | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Engineering Research Center of Circular Agriculture, Yangling, Shaanxi 712100, China | | YANG Gaihe | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Engineering Research Center of Circular Agriculture, Yangling, Shaanxi 712100, China | | LIU Nana | Ningxia Zhongke Jingke Testing Technology Co., Ltd, Yinchuan, Ningxia 750011, China |
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| Abstract: |
| Effects on dynamic changes in different fractions of soil nitrogen, soil carbon and crop yield by different treatments of straw retention under long time rotation of winter wheat and summer soybean by field experiment were studied. The straw residue treatments included no straw retention (NS), retention of half straw (HS), and retention of total amount of straw (TS). The result showed that the straw retention enhanced the soil total nitrogen (TN), nitrate (NO-3-N), microbial biomass nitrogen (MBN), soil mineral nitrogen (SMN) and soil organic carton (SOC), dissolved organic carton (DOC)，and microbial biomass carbon (MBC) contents, with significant differences between the different treatments. The average of TN, SMN, NO-3-N，MBN contents of 0~40 cm soil under HS treatment was increased 10.51%, 11.58%, 15.71% and 35.68% when compared with that of NS treatment, respectively; and the numbers were increased 19.61%, 21.84%, 26.50%, and 40.77% under TS treatment compared with that of NS treatment, respectively. The content of SOC increased 4.10% and 14.58%, the DOC content increased 2.01% and 6.68%, and MBN increased 6.71% and 7.67% under HS and TS treatments when compared with NS treatment, respectively. The soil TN, SMN and NO-3-N contents were higher from September to December and lower from March to May, but the trends of MBC, MBN contents had opposite direction. The contents of carbon and nitrogen components were higher in the surface soil (0~20 cm) than in the subsoil (20~40 cm). Straw retention treatments increased yield of wheat and soybean significantly, and the rate increased 3.63% and 5.44% under HS treatment, and 19.69%, 10.38% under TS treatment as compared with no return treatment. In conclusion, total straw retention under longtime wheat\|soybean rotation has maintained soil fertility, reduced fertilizer application, and enhanced the ability of soil carbon sequestration in farmlands as to increase crop yields. |
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