| Effects of slow-release urea on soil inorganic N and yield in drip-irrigated cotton field |
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| DOI：10.7606/j.issn.1000-7601.2017.02.26 |
| Key Words: drip irrigation cotton field slow-release urea inorganic nitrogen yield |
| Author Name | Affiliation | | LI Wei | Department of Resources and Environmental Science, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | YE Jun | Department of Resources and Environmental Science, College of Agronomy, Shihezi University, Shihezi, Xinjiang 832003, China | | ZHEN Ji-liang | Xinjiang XLX Energy Chemical Co., Ltd，Manasi, Xinjiang 832200, China | | YUE Yan-jun | Xinjiang XLX Energy Chemical Co., Ltd，Manasi, Xinjiang 832200, China |
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| Abstract: |
| The objective of this experiment was to study the effect of slow-release urea fertilizer on soil inorganic N distribution, N accumulation, residual N concentration, yield, N use efficiency, and the N balance. Findings from this study can be used to determine if slow-release urea can be applied to drip-irrigated cotton and to decide the optimum application rate at planting. The results showed that the concentration of NO3--N and NH4+-N significantly increased by using slow-release urea, and the content of nitrate nitrogen in the soil treated with slow-release urea increased by 189.27%, 195.58% and 112.70% respectively. The accumulation amount of inorganic nitrogen in the soil in fertilization treatment showed the enrichment phenomenon, and the negative accumulation effect was shown in the treatment of nitrogen fertilizer. The content of inorganic nitrogen in soil decreased with the increase of the proportion of base fertilizer, while the apparent N loss and the increase of the percentage of nitrogen surplus decreased first and then increased. Cotton yield, nitrogen use efficiency and agronomic efficiency increased first and then decreased with the increase in the proportion of base fertilizer of slow-release urea, and the yield was attributed to the increase in the boll number and boll weight of cotton. In conclusion, under the experimental conditions, with slow-release urea being 50% of the total nitrogen, the yield of drip-irrigated cotton and nitrogen use efficiency were higher, and apparent N loss was lower. |
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