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| Titel: |
Verification of the VDLUFA humus balance method using long-term field trials |
| Auteur: |
Kolbe, Hartmut |
| Verschenen in: |
Archives of agronomy & soil science |
| Paginering: | Jaargang 51 (2005) nr. 2 pagina's 221-239 |
| Jaar: |
2005-04 |
| Inhoud: |
The humus balance method produces an organic matter balance sheet calculated from factors describing the cultivation effects of humus increasing and humus depleting crops, and organic manure application. Related results were tested for accuracy by comparison with findings from long-term field trials conducted in different climatic regions and soil types throughout Germany. The following results were obtained for lower (uG) and upper (oG) factor values while at the same time aiming to meet 100% of organic matter demand. Related trial plots showed optimal to maximal crop yields and field balance sheets for nitrogen of about 50 kg N ha-1 a-1. Stable manure was supplied at a rate of approx. 10 tonnes ha-1 when using the uG factors, and about 14.5 tonnes ha-1 for the oG factors. As regards adherence to site-specific organic matter contents, it was found that accuracy differed clearly depending on site, cultivation method and organic matter factors used. There was a total difference of 0.11% Corg between calculations using the uG and oG factors. Initial Corg contents in light and Middle Eastern German soils were maintained when using the uG factors, whereas the oG factors proved more favourable for loam in western and eastern Germany, and for the light soils of more humid climatic regions in western and southern Germany. These findings enable an optimal adaptation of the humus balance method to different sites and cultivation practices. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 11 gevonden artikelen
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