文献类型： 外文期刊

第一作者： KOLBE, H

作者： KOLBE, H;MEINEKE, S;ZHANG, WL

作者机构：

期刊名称：AGRIBIOLOGICAL RESEARCH-ZEITSCHRIFT FUR AGRARBIOLOGIE AGRIKULTURCHEMIE OKOLOGIE （ 影响因子：0.333； ）

ISSN： 0938-0337

年卷期： 1995 年 48 卷 1 期

页码：

收录情况： SCI

摘要： Investigations were carried out to answer the question whether differences in the yield and chemical composition of organically and minerally fertilized potato tubers are purely caused by varied nutrient supply or whether additional effects are contributory. The following fertilizer treatments long-term field trial were evaluated for the 1981 to 1983 time period: (A) mineral NPK-fertilization since 1952; (B) 1952 to 1979 organic fertilization (similar to C) and thereafter mineral fertilization as A; (C) fertilization with compost of farm yard manure since 1952. The mean NPK-nutritional effects of the 3 treatments on tuber yield and chemical composition were calculated by the use of models which quantitatively describe the relationships between the NPK-nutrient concentration and the yield and composition of the potato tubers at harvest time. Comparisons of tuber yield and chemical composition between experiments and model calculations which were based on the, NPK-combinations found in the experiments gave the following results. The long-term effect of organic fertilizer regimes (B, C compared to A) brought out a higher potential tuber yield and nutrient efficiency which were caused by both available nutrient amount and other effects which were also important for the optimal crop growth. The latter attributes were related to favourable soil conditions originated by the organic matter input: humus, C/N ratio, soil structure. Furthermore, continued organic fertilizer application (C compared to A, B) led to about 10% to 20% higher tuber yields and was mostly responsible for specific changes of the tuber chemical composition other than those expected by the NPK-nutrient supply. These short-terms effects of organic fertilization were caused by the fertilizer treatments during the growth periods and led to tuber materials which were higher in dry matter, starch, NPN-compounds and ascorbic acid contents, and which contained about 50% lower nitrate contents compared to mineral fertilization (A, B). Possible causal reasons for these non-nutritional effects are discussed.

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