The Effects and Assessment of Short-term Application of Hog Manure Compost
| Autor: | Chia-Hsing Li, 李家興 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 The concept of organic agriculture and assessment of soil quality are more important while sustainable agriculture is more popular during the last decade. In Taiwan, it was common phenomena that excess application of chemical fertilizers resulting in lower contents of organic matter, more soil acidity, and worse soil quality. Nowadays, many investigators suggest that more application of organic matter can promote soil physical, chemical, and biological properties. The recycling disposal in agricultural soils of livestock manure are actually performance for sustainable agriculture. It is general that the addition of Cu and Zn into the feed to increase the hog’s growth and health. This addition resulted that high concentration of Cu and Zn were residual in the hog fecal and hog manure compost. After applying this kind of hog manure compost on the soil, land managers must pay more attention on monitoring the changes of soil quality. Soil is one of important natural resources, therefore we must study the influence of specific land management on the soil quality and avoid decreasing the soil quality. For reasonable and max-consumptive application of hog manure compost, the objectives of this study are to assess the effects of short-term application of different quantity of hog manure compost on soil quality, crop growth and the accumulation of Cu and Zn in the crops. The experimental site was located at National Taiwan University and the soil type is Kungkuantzu silty loam. The investigation was conducted from 1997 to 2001 while corn and cabbage were grown in rotation system with traditional cultivation. The soil treatments included appling low, medium, and high amount of hog manure compost compared with control treatment (no application of compost). Selected soil properties including available nutrient (N, P, and K), aggregate stability (1.4-2.83 mm fraction), soil biomass carbon (fumigation incubation technique), organic carbon, bulk density, and soil pH were determined and compared. Standard scoring functions of specific soil quality indicators and a soil quality model was proposed to calculate and evaluate the soil quality index. The results indicated that available nutrient, water stable aggregate (%), organic C, and soil pH were significantly higher in the soils applying with 60 tons/ha of hog manure compost than that of control treatment. Although the DTPA extractable concentration of Cu and Zn in the surface soil was increased after applying the hog manure compost, the content of Cu and Zn are still much lower than the proposed threshold of heavy metal in the rural soils. The soil quality of the treatments applied with medium and high quantity of compost in this study was significantly higher than that of control treatment (p |
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