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| Sommer, Dipl.-Ing. agr. Hendrik; Leithold, Prof.Dr. Günter; Schmid-Eisert, Dipl.-Ing.agr. Andreas. |
| An optimal supply of dairy cows with energy and nutritive substances is just as important for the organic as it is for the conventional milk production. The current project examined if in organic rural economy the feeding meets the required demand. In the trial period from 10 Nov. 2001 till 17 Oct.2003 data of the milk performance test were gathered for 11 capacity control days. The energy and nutritive substance made a silage food capacity of 17 -24 kg milk per cow and day possible, so a milk capacity of 8157 kg milk per cow and year could be realized. A suspected shortage of nitrogen based on the low milk urea concentration caused by the normal milk protein concentration could not be confirmed. The result of the capacity control showed that only 76 %... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general; Dairy cattle. |
| Ano: 2005 |
URL: http://orgprints.org/3648/1/3648.pdf |
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| Hillebrecht, Björn; Brock, Christopher; Leithold, Prof.Dr. Günter. |
| The aim of this work was to study seasonal changes of topsoil Ct and Nt contents in comparison with Ct and Nt mass changes. The survey was carried out under winter rye with succeeding catch crop. A special experimental design was chosen to minimize space/time interactions and prevent disturbance of sampling points at the same time. The observation of mass changes instead of content changes substantially improved the analytical quality of results in this study, which was in line with findings from the literature. It is concluded that considering bulk density should therefore be recommended as a standard procedure in surveys of soil Ct and Nt dynamics. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2009 |
URL: http://orgprints.org/14567/1/Hillebrecht_14567.pdf |
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| Brock, Dipl.geogr. Christopher; Leithold, Prof.Dr. Günter. |
| Soil organic matter (SOM) balances can assist sustainable organic matter management. Still, existing methods need to be revised, especially when applied in organic farming. A basic problem is the linear concept which seemingly does not reflect the effective dynamic. Furthermore the relevance of SOM is dependent on the cultivation system and cultivation intensity, respectively. The importance of SOM as a nutrient source increases with diminishment of cultivation intensity, i.e. synthetic fertilizer application. Here turnover of organic matter becomes the key factor for nutrient supply. Correspondingly, a higher SOM reproduction level that promotes increased SOM content and/or turnover should be an objective in organic farming. Soil organic matter... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil. |
| Ano: 2006 |
URL: http://orgprints.org/7219/1/Vortrag_OrgCon2006_2.doc |
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| Brock, Christopher; Leithold, Prof.Dr. Günter; Schulz, Franz. |
| Year-to year changes of soil organic matter (SOM) have been surveyed in a long-term experiment in order to allow for crop/cropping system impact assessment. Legumes usually caused SOM build-up, which on the other hand only to a short extend remained during the succeeding years. Considerable SOM decrease could be found under potatoes. SOM dynamics under cereals varied strongly according to aspects of the respective cropping system, especially precrop and fertilization. Green manure but also farmyard manure obviously increased short-term decomposable fractions of SOM, promoting mineralization of SOM in the following period. Long-term changes of SOM in the experiment were somewhat less pronounced than year-to-year changes, pointing on the high... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions. |
| Ano: 2009 |
URL: http://orgprints.org/14564/1/Brock_14564.pdf |
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