Heisig W, Müller G, Lingner D
Zentralbl Bakteriol Naturwiss. 1980;135(1):45-54.
It is reported on the influence of a long-term field trial with straw manuring at different terms and different nitrogen fertilization steps on the qualitative properties of the organic soil substance. Straw manuring in autumn increased the carbon content in the soil. Increasing amounts of nitrogen intensified this effect. Straw manuring in spring only with simultaneously applied quantities of 100 and 200 kg N/ha, respectively, brought about an increased content of organic substances in soil. With straw manuring in autumn, fractionation of the organic substance in soil showed a smaller amount of humic acids. Increasing nitrogen addition reduced this amount still more than in the plots with straw manuring in spring. The quota of fulvic acids increased. Therefore, the higher content of organic substances, obtained with straw manuring in autumn, is based on an increase of the pre-stages of humic acids and non-humic matter.
据报道，一项长期田间试验研究了不同时期和不同氮肥施用阶段进行秸秆还田对有机土壤物质质量特性的影响。秋季秸秆还田增加了土壤中的碳含量。氮肥用量增加强化了这一效果。春季秸秆还田且同时分别施用100和200千克氮/公顷时，土壤中有机物质含量增加。秋季秸秆还田时，土壤中有机物质的分级显示腐殖酸含量较少。增加氮肥施用量使腐殖酸含量减少的幅度比春季秸秆还田的地块更大。富里酸的比例增加。因此，秋季秸秆还田获得的较高有机物质含量是基于腐殖酸前体和非腐殖物质的增加。
