Deep placement of nitrogen fertilizer in autumn improves N utilization by spring tea (Camellia sinensis L.)

文献类型： 外文期刊

第一作者： Ma, Lifeng

作者： Ma, Lifeng;Ruan, Jianyun

作者机构：

关键词： deep side dressing; shallow side dressing; soil incorporation; surface broadcasting; urea; young shoots

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

ISSN： 1436-8730

年卷期： 2021 年 184 卷 4 期

页码：

收录情况： SCI

摘要： Background The efficient use of fertilizers depends very much on their proper placement, and the effects of fertilizer placement on the woody perennial plant tea (Camellia sinensis L.) are not clearly understood. Methods A N-15 mini-plot field experiment was conducted to investigate the effects of four common techniques of fertilizer placement techniques. N-15-labeled urea was applied in October by surface broadcasting, surface broadcasting with 3-5 cm soil incorporation, shallow (3-5 cm), and deep (10-15 cm) side dressing (DSD). The proportion of N derived from N-15-labeled fertilizer (N-dff%) was estimated in root, and soil samples were collected 15 and 43 days after fertilization (DAA15 and DAA43) and in young shoots collected in the following spring. Results Most fertilizer N-15 was located in the soil near the placement position at DAA15 and N-15 had moved downward but maintained a similar distribution in the soil profile at DAA43. The distribution of fibrous root N-dff% in the soil profile was very similar to that of soil N-dff%. DSD resulted in the highest shoot N-dff%, the estimated amount of N-15 in young shoot derived from N-15-label fertilizer (shoot N-15), and its percentage related to the amount of N-15-labeled fertilizer input (REFN%). Thus, DSD of urea as basal application in autumn maintained a higher and prolonged N supply in the middle and deep soil layers, thereby improving fertilizer-N absorption and utilization in the following spring tea. However, direct broadcasting of urea on the soil surface resulted in low N availability in the soil and utilization by tea plants. Conclusion Our results demonstrate that DSD of N fertilization should be recommended for tea planting to increase N use efficiency and reduce environmental losses in forms of runoff and volatilization.

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