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Thermo Condition Determines the Uptake of Autumn and Winter Applied Nitrogen and Subsequent Utilization in Spring Tea (Camellia sinensis L.)

文献类型： 外文期刊

作者： Ma, Lifeng 1 ; Jiang, Shuangfeng 3 ; Deng, Min 4 ; Lv, Lize 3 ; Xu, Ze 4 ; Ruan, Jianyun 1 ;

作者机构： 1.Chinese Acad Agr Sci, Tea Res Inst, Hangzhou 310008, Peoples R China

2.Minist Agr, Key Lab Tea Biol & Resources Utilizat, Hangzhou 310008, Peoples R China

3.Xingyang Acad Agr Sci, Xingyang 464000, Peoples R China

4.Chongqing Acad Agr Sci, Res Inst, Chongqing 402160, Peoples R China

关键词： N reserves; N remobilization; temperature; growing degree days; dormancy; timing of fertilization

期刊名称：HORTICULTURAE （ 影响因子：2.923； 五年影响因子：3.582 ）

ISSN：

年卷期： 2021 年 7 卷 12 期

页码：

收录情况： SCI

摘要： The effect of thermal condition on the uptake of autumn and winter applied N and its subsequent utilization in spring tea (Camellia sinensis) was investigated by applying N-15 enriched urea as single or split applications between October and February in two commercial plantations at Xingyang of Henan province and Yongchuan of Chongqing with different thermal conditions. The proportion of N derived from N-15-labeled urea (N-dff%) in fibrous root and mature leaves 15 days after application at Xingyang and the N-dff% of mature leaves on the day of the first spring tea harvest at both sites were the highest in the single October application. The N-dff% of the following spring tea was also the highest in the single October application at both sites. The results showed that application of N fertilizer in October relative to other later months most significantly improves the accumulation of plant N reserves and consequently contributes more significantly to the early spring tea. Such timing effect was related to the thermal condition, i.e., the growing degree days (degrees C center dot d, T > 8 degrees C) between the dates of fertilization and harvest of young shoots, which represents the combining effect of the temperature and the residence time of N fertilizer in the soil.

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