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Field evaluation of nitrogen volatilization loss during fertigation through center pivots

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  • Fan, Xinrui
  • Zhao, Weixia
  • Li, Jiusheng

Abstract

Nitrogen volatilization loss is an important consideration for sprinkler fertigation. To evaluate the effects of fertilizer types, N concentrations and meteorological factors on nitrogen volatilization loss during the fertigation process, urea (nitrogen mass concentration of 0.025–0.15%), ammonium sulfate (0.025–0.15%), monoammonium phosphate (0.01–0.02%), ammonium bicarbonate (0.015–0.025%) and nitrogen-potassium compound fertilizer (0.025–0.15%) were tested through a center pivot system in the North China Plain. A total of 135 tests were conducted under varying environments with temperatures ranging from 14 to 31 ℃, relative humidity ranging from 9% to 90% and wind speeds ranging from 0.65 to 3.85 m s−1. The results showed that fertilizer types and nitrogen concentrations had little influence on the uniformity coefficient (CU) of nitrogen concentration obtained above the ground, which remained at a high level with an average of 98%. The average loss rates of nitrogen volatilization for urea, ammonium sulfate, nitrogen-potassium compound fertilizer, monoammonium phosphate and ammonium bicarbonate were 6.7%, 9.2%, 10.7%, 12.3% and 14.0%, respectively. Temperature, relative humidity and wind speed influenced nitrogen loss, while temperature was the most important factor. The effects of N concentrations on nitrogen loss were dependent on fertilizer type. For urea and nitrogen-potassium compound fertilizers, the nitrogen loss increased with increasing N concentrations up to 0.05%; however, a decreasing trend in the nitrogen loss rate was observed when the fertilizer concentration exceeded 0.05%. The nitrogen loss rate of ammonium sulfate decreased significantly with increasing N concentrations, while the loss of monoammonium phosphate and ammonium bicarbonate increased significantly with increasing N concentrations. A machine learning model was constructed with fertilizer types, N concentrations, temperature and wind speed as input variables to predict nitrogen loss. The model was verified with acceptable accuracy and can be used to estimate nitrogen volatilization loss during sprinkler fertigation. Our study suggested that the fertilizer type and concentrations should be carefully selected while considering meteorological factors to minimize nitrogen volatilization losses during sprinkler irrigation.

Suggested Citation

  • Fan, Xinrui & Zhao, Weixia & Li, Jiusheng, 2023. "Field evaluation of nitrogen volatilization loss during fertigation through center pivots," Agricultural Water Management, Elsevier, vol. 280(C).
    • Handle: RePEc:eee:agiwat:v:280:y:2023:i:c:s037837742300080x
    DOI: 10.1016/j.agwat.2023.108215
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    References listed on IDEAS

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    1. Zhang, Xiying & Uwimpaye, Fasilate & Yan, Zongzheng & Shao, Liwei & Chen, Suying & Sun, Hongyong & Liu, Xiuwei, 2021. "Water productivity improvement in summer maize – A case study in the North China Plain from 1980 to 2019," Agricultural Water Management, Elsevier, vol. 247(C).
    2. Ortíz, J.N. & Tarjuelo, J.M. & de Juan, J.A., 2009. "Characterisation of evaporation and drift losses with centre pivots," Agricultural Water Management, Elsevier, vol. 96(11), pages 1541-1546, November.
    3. Zhao, Weixia & Shan, Zhijie & Li, Jiusheng & Li, Yanfeng, 2020. "Effects of fertigation splits through center pivot on the nitrogen uptake, yield, and nitrogen use efficiency of winter wheat grown in the North China Plain," Agricultural Water Management, Elsevier, vol. 240(C).
    4. Mattar, Mohamed A. & Roy, Dilip Kumar & Al-Ghobari, Hussein M. & Dewidar, Ahmed Z., 2022. "Machine learning and regression-based techniques for predicting sprinkler irrigation's wind drift and evaporation losses," Agricultural Water Management, Elsevier, vol. 265(C).
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