• ISSN 1008-505X
  • CN 11-3996/S
李延菊, 李宪利, 高东升, 张序. 设施栽培油桃对叶面施15N的吸收、分配特性研究[J]. 植物营养与肥料学报, 2007, 13(4): 678-683. DOI: 10.11674/zwyf.2007.0422
引用本文: 李延菊, 李宪利, 高东升, 张序. 设施栽培油桃对叶面施15N的吸收、分配特性研究[J]. 植物营养与肥料学报, 2007, 13(4): 678-683. DOI: 10.11674/zwyf.2007.0422
LI Yan-ju, LI Xian-li, GAO Dong-sheng, ZHANG Xu. Study of the absorption and distribution characteristics of 15N-urea applied to leaves of nectarine planted in greenhouse[J]. Journal of Plant Nutrition and Fertilizers, 2007, 13(4): 678-683. DOI: 10.11674/zwyf.2007.0422
Citation: LI Yan-ju, LI Xian-li, GAO Dong-sheng, ZHANG Xu. Study of the absorption and distribution characteristics of 15N-urea applied to leaves of nectarine planted in greenhouse[J]. Journal of Plant Nutrition and Fertilizers, 2007, 13(4): 678-683. DOI: 10.11674/zwyf.2007.0422

设施栽培油桃对叶面施15N的吸收、分配特性研究

Study of the absorption and distribution characteristics of 15N-urea applied to leaves of nectarine planted in greenhouse

  • 摘要: 以设施栽培的5年生早红珠油桃/山毛桃为试材,应用15N示踪技术研究油桃叶片对15N-尿素的吸收及运转特性。结果表明,叶片施用15N-尿素标记叶吸收主要发生在叶片涂抹15N-尿素后6.h内,平均吸收速率为0.204mg/(g.h);标记叶中15N吸收量24.h达到最高,新梢和梢顶嫩叶15N含量在施用15N-尿素48.h达到最高,下部叶15N含量很低,没有明显的峰;处理168.h各器官中15N含量为标记叶梢顶嫩叶新梢下部叶;试验结束时分配势Ndff(即各器官N含量来自化肥N所占的百分率)为标记叶中最高,然后依次为梢顶嫩叶、新梢、下部叶。这说明氮素迅速被吸收并运到嫩梢和嫩叶中,从而促进这些新生器官的形态建造,可起到以N增C的作用。不同叶面处理的试验还表明,正面和背面全部涂抹的叶片15N含量最高,只涂抹叶片背面次之,涂抹正面最低。设施栽培油桃叶片可迅速吸收尿素,其吸收量早晨明显优于中午和下午,因此设施油桃栽培管理中于早晨进行叶面施尿素,且正反面兼顾,N素的吸收利用效果最好。

     

    Abstract: This research was carried out in a greenhouse in 2005.Mature trees of Zaohongzhu nectarine/wild peach were fertilized in spring with 15N-labelled urea via leaf,and the nitrogen absorption and distribution characteristics were studied using isotope 15N.The uptake of 15N by leaves mainly occurred during the first 6 hours following application of urea.The mean rate of absorption during this period was 0.204 mg/(gh).The content of 15N in leaves peaked 24 hours after urea application and then decreased,whereas 15N content in younger leaves and new shoots peaked 48 hours and 15N content in older leaves was very low. Moreover,15N content in different tissues followed this order: treated leaves younger leaves new shoots older leaves.At the end of the experiment(168h),however,mobility of urea-derived N varied with different organs: treated leavesyounger leavesnew shootsolder leaves.The result suggested that the distribution of absorbed N was mainly translocated to the younger leaves and new shoots.Thus foliar application of N accelerated growth and formation of newly organs.15N absorption was greatest in leaves with both abaxial and adaxial leaf surface treatments,followed by abaxial leaf surface treatment and adaxial leaf surface treatment.Applying foliar 15N-urea during morning resulted in greater absorption of 15N than in the afternoon or at noon.It is clear that mature trees of Zaohongzhu nectarine could rapidly absorb urea applied to leaves and maximum N absorption from foliar urea sprayed to both abaxial and adaxial leaf surfaces in the morning.

     

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