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Effects and residual effects of straw, farmyard manuring, and mineral fertilization at Field F of the long‐term trial in Halle (Saale), Germany
Author(s) -
Stumpe Hermann,
Wittenmayer Lutz,
Merbach Wolfgang
Publication year - 2000
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200012)163:6<649::aid-jpln649>3.0.co;2-h
Subject(s) - straw , human fertilization , chemistry , humus , agronomy , zoology , farmyard manure , manure , fertilizer , soil water , soil science , environmental science , biology , inorganic chemistry , organic chemistry
The effects and residual effects of farmyard manure (FYM), straw fertilization and mineral N fertilization were investigated in Field F of the long‐term fertilization trial in Halle (Saale), Germany. With sufficient mineral N fertilization, FYM and straw did not directly affect yield. The application of FYM alone increased the yield of potato less than those of silage maize and sugar beet. With low mineral N fertilization, however, residual effects of FYM, applied to root crops, were observed in the following cereal crops. Application of more mineral N to root crops had the same residual effects. In case of omitted mineral N fertilization, the humus content of the soil decreased rapidly. This implies that almost no stable humic material had been accumulated by application of FYM and straw. The calculated N loss increased with enhanced organic fertilization. In case of mineral N fertilization the content of organic C (C org ) was slightly higher (1.4 to 1.5%) than without any N fertilization (1.3%). FYM and straw (with same amounts of dry matter) likewise enhanced the C org ‐content and, consequently, the content of decomposable C (C dec ). In general, organic fertilizers should not be applied in too large amounts to avoid N losses.