Quantifying the Flows of Nitrogen Fertilizer under Different Application Rates in a Soil-Forage Triticale-Dairy Cow System

文献类型： 外文期刊

第一作者： You, Yongliang

作者： You, Yongliang;Yang, Xianlong;Wang, Zikui;Li, Yuan;Lai, Xingfa;Shen, Yuying;You, Yongliang;Liu, Guibo;You, Yongliang;Liu, Guibo

作者机构：

关键词： N-15-labeled technology; soil-crop-livestock system; forage triticale; migration and distribution; nitrogen use efficiency

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 12 期

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收录情况： SCI

摘要： Nitrogen (N) can enhance the biomass and feeding quality of forage crops and advance the growth of the herbivorous livestock industry. Investigating the N fertilizer dynamics in the soil-crop-livestock system is important for resource-use efficiency and environmental safety. By using the N-15-labeled technology and the in vitro incubation technique, an experiment was conducted in the North China Plain (NCP) in 2015-2016 to quantify the migration and distribution of N fertilizer in the soil-forage triticale (X Triticosecale Wittmack)-dairy cow system. The results showed that 34.1-37.3% of the applied N fertilizer was absorbed by forage triticale, in which 35.9-39.6% N accumulated in the stems and 60.4-64.1% accumulated in the leaves. In addition, 36.3-39.1% of the applied N fertilizer remained in the 0-100 cm soil layer, in which 81.8-91.3% was distributed in the 0-40 cm soil layer. The remaining 24.6-26.8% of the applied N fertilizer was lost in various ways and 28.1-31.3% of the N fertilizer could be utilized by dairy cows. When N fertilizer was applied between 0-225 kg N ha(-1), the increased application of N fertilizer improved the biomass yield from 14.0 to 17.5 t ha(-1) and enhanced the N content of the forage triticale from 1.3% to 1.4%; however, it did not significantly affect the distribution rate of N fertilizer in the soil-forage triticale-dairy cow system. The optimum N fertilizer application rate for forage triticale is less than 225 kg N ha(-1) to maintain high-efficient N use in the soil-crop-livestock system and reduce the environmental risks in the NCP. Our results quantified the N fertilizer dynamics in the soil-forage triticale-dairy cow system and provided a significant reference for guiding rational strategies of forage triticale cultivation.

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