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| Effects of maize straw addition on soil ammonia volatilization and nitrogen absorption of pepper in greenhouse |
| Received:April 02, 2022 Revised:June 01, 2022 |
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| KeyWord:straw returning;ammonia volatilization;nitrogen absorption;greenhouse;ammonium nitrogen;nitrate nitrogen |
| Author Name | Affiliation | | WU Hongyan | Liaoning Institute of Microbiology, Chaoyang 122000, China | | YU Miao | Liaoning Institute of Microbiology, Chaoyang 122000, China | | GAO Xiaomei | Liaoning Institute of Microbiology, Chaoyang 122000, China |
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| Abstract: |
| The effect of maize straw addition on soil ammonia volatilization and pepper nitrogen accumulation was determined in this study. Soil from a vegetable greenhouse was collected as the research object, and pepper was used as the test material. Four treatments were set under conventional fertilization（N 100 kg·hm-2, P2O5 70 kg·hm-2, K2O 80 kg·hm-2）without（CK）or with straw application（S1=4 500 kg· hm-2; S2=9 000 kg·hm-2; and S3=13 500 kg·hm-2）. In situ ammonia volatilization from soil in which pepper was planted was monitored using the venting method. The contents of ammonium and nitrate nitrogen in the soil and total nitrogen in pepper shoots were measured at different times. During the monitoring period, ammonia volatilization from soil and the ammonia volatilization rate of different straw returning amounts reached the peak on the 7th day. The maximum ammonia volatilization rate under S2 was respectively 43.0%, 12.8%,and 17.9% lower than that under CK, S1, and S3. The mean ammonia volatilization rate under S2 was respectively 30.0%, 7.5%, and 20.0% lower than that under CK, S1, and S3. In all treatments, the maximum of soil ammonium nitrogen level was recorded on the 7th day. The ammonium nitrogen content under S2 was respectively 24.2%, 11.5%, and 14.8% lower than that under CK, S1, and S3. The difference between S2 and CK was extremely significant. In all treatments, the maximum soil nitrate nitrogen level was recorded on the 21st day, The maximum soil nitrate nitrogen content under S2 was respectively 62.8%, 25.8%, and 47.2% higher than that under CK, S1, and S3, and there were significant differences among all treatments. On the 60th day, nitrogen accumulation in pepper shoots under S1, S2, and S3 was respectively 13.7%, 19.1%, and 9.3% higher than that under CK, and there were significant differences among all treatments. S2 increased pepper yield by 14.3% compared with CK. During the monitoring period, soil ammonia volatilization was significantly and negatively correlated with the aboveground nitrogen accumulation and yield of pepper. Overall, the optimal straw returning amount was 9 000 kg·hm-2. Thus, maize straw application can significantly reduce ammonia volatilization and soil ammonium nitrogen but increase soil nitrate nitrogen to significantly promote plant nitrogen accumulation and minimize agricultural pollution. |
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