[A long-term experiment on the complex influence of cultivating, fertilizing, and crop rotation measures on humic substances in soil and development of yield (author's transl)].

W Heisig, G Müller, U Völker
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Abstract

In a 10-year field experiment, the influence of fertilizing, cultivating, and crop rotation measures on the C-content of the soil, humus quality of the organic soil substance, and the yield was investigated. With cultivation of fodder plants only, the C-content of the soil can be improved by increased mineral and increased organo-mineral fertilization at any depth of cultivation. When in the same location there was a turn between cereals and green crops, a decrease of C-rate can only be prevented by increased organo-mineral fertilization. Continuous cultivation of root crops resulted in a decrease of the C-content. Deeper tillage of the soil generally decreased C-content. Within the years, a variability of the pure humin substances could be detected, depending on the rotation of crops and C-content. The composition of the fulvic acids is differentiated in dependence on the factors "time" and "cultivation". The effect of fertilization variants on the yield was different. Fertilization in that location with manure only, compared with mineral fertilization, caused in most cases depression in yield. Decrease on yield by deeper ploughing had the least influence with root crops.

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[栽培、施肥和轮作措施对土壤腐殖质和产量发展复杂影响的长期试验[作者译]。
通过10年的田间试验,研究了施肥、栽培和轮作措施对土壤c含量、有机土壤腐殖质质量和产量的影响。在只种植饲料植物的情况下,在任何种植深度增加矿质肥和增加有机矿肥都可以提高土壤c含量。在同一地点,当谷物和绿色作物之间发生转变时,只能通过增加有机矿肥来防止碳率的下降。连作块根作物导致碳含量下降。土壤深耕一般会降低碳含量。在几年内,纯人类物质的变化可以被检测到,这取决于作物的轮作和c含量。黄腐酸的组成取决于“时间”和“栽培”因素。施肥变异对产量的影响是不同的。与矿物施肥相比,在该地区只施用有机肥在大多数情况下造成产量下降。深耕对块根作物减产影响最小。
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