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Combining controlled-release urea with potassium chloride to reduce soil N/K leaching and promote growth of Italian ryegrass by Jibiao Geng; Xiuyi Yang; Shutong Lei; Qingping Zhang; Hui Li; Ying Lang; Xianqi Huo; Qianjin Liu is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Abstract Nitrogen (N) and potassium (K) are essential nutrients for Italian ryegrass (__Lolium multiflorum__ L.) growth. A 2-year field experiment with a split-plot design was conducted to study the effect of N fertilizer type combined with different K fertilizer rates on the soil mineral N and K availability, and growth characteristics of Italian ryegrass. The main plots were assigned to two N fertilizer types, controlled-release urea (CRU) and common urea. While low, moderate and high potassium chloride (KCl) rates (150, 300 and 450 kg ha^−1^, respectively) were assigned to the subplots. Compared with the common urea treatments, the CRU significantly increased the SPAD value, plant height, leaf area, and photosynthetic index of Italian ryegrass, which significantly prolonged the green stage of Italian ryegrass and prevented premature senescence. Moreover, the dry yields of the CRU increased by 4.5–12.5% in 2019 and 10.9–25.3% in 2020 compared with the urea, respectively. At the same time, compared with the KCl150 and KCl450 treatments, the KCl300 treatment resulted in better plant growth. Overall, the CRU × KCl300 maximized the soil inorganic N and different soil K forms, and

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Author

Jibiao Geng; Xiuyi Yang; Shutong Lei; Qingping Zhang; Hui Li; Ying Lang; Xianqi Huo; Qianjin Liu

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)