Effect of chemical fertilizer and compost on natural N-15 abundance of tomato leaves and fruits

文献类型： 外文期刊

第一作者： Guo, Zhicheng

作者： Guo, Zhicheng;Li, Yuzhong;Li, Qiaozhen;Xu, Chunying;Dong, Yiwei;Fang, Fuli

作者机构：

关键词： Natural N-15 abundance;delta N-15;Tomato;Organic food;Compost;Chemical fertilizer

期刊名称：NATURAL RESOURCES AND SUSTAINABLE DEVELOPMENT II, PTS 1-4

ISSN： 1022-6680

年卷期： 2012 年 524-527 卷

页码：

收录情况： SCI

摘要： Organic farming is a good way to reduce environmental pollution. However, no related detection of fertilizer applications, which are extremely important in organic farming, exists. The delta N-15 value of chemical fertilizer (-3.8 to +2 parts per thousand) is far lower than compost (>+10 parts per thousand). Thus, natural N-15 abundance (delta N-15) in leaves and fruits may be used to reveal the application of N fertilizer. In this experiment, six treatments were laid out: 635 g (Cl), 952 g (C2), and 1270 g (C3) of compost were applied as basal fertilizer in each pot. Alternately, 10.7 g (U1), 16 g (112), and 21.3 g (113) of urea were applied as basal fertilizer and 10.7 g (U1), 16 g (112), and 21.3 g (U3) urea were applied as top-dressing, respectively, in each pot. Cl and U1, C2 and U2, and C3 and U3 had equal amounts of nitrogen fertilization. In all three fertilizer levels, the leaves and fruits sampled from the U group had significantly lower values than those sampled from the C group within the same period. The delta N-15 values of the leaves and fruits from the C group decreased slowly. The delta N-15 values of leaves sampled at 40 days after transplanting were fairly low. The delta N-15 values of leaves and fruits from the U group increased initially, due to the small amounts of urea left, which then led the plants to absorb N from the culture substrates. However, the delta N-15 values of leaves and fruits from the U group decreased rapidly after the top-dressing was applied, where the minimum values occurred during the final stage.

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