The Influence of Application of Hog Manure Compost on Soil Quality and Heavy Metal Uptake by Crops

• Main Authors: Wu, Mau-Yi, 吳茂毅
• Other Authors: Chen, Zueng-Sang
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/17390538062636797676

碩士 === 國立臺灣大學 === 農業化學研究所 === 88 === In order to approach the optimum crop yields as well as to maintain soil, crop and environment quality, we have to study the strategy of sustainable management of soil resources. Since the organic carbon content in Taiwan arable soil is too low, application of organic material into the soils is essential to maintain good soil quality and to improve the physical, chemical and biological soil properties. Based on studies in Taiwan, hog manure composts almost contain higher concentration of copper and zinc than that of critical concentration. The objectives of this study are to discuss the influences of application of hog manure compost (1) on the soil physical, chemical, and biological properties, (2) on the accumulation of heavy metals in the soils, (3) on the accumulation of heavy metals and the yields of cabbages and corn, and (4) on the changes of soil quality. The experimental site was located at Agricultural Experimental Field of National Taiwan University. Cabbages and corns were rotating planted from 1997 to 1999. The hog manure composts were applied at the rates of 0 (control), 30, 60, and 120 tons/ha into the site in Nov. 1997. The changes of soil physical, chemical, and biological properties were monitored for soils sampled from 0-20 and 20-40 cm depth. The crop yields and the accumulation of heavy metals in the leaves, stems and grain of crops were also analyzed and assessed. We also assess the changes of soil quality based on a model calculated from soil quality index to compare the influence of application at different hog manure compost on the changes of soil quality in one and half year and two years after the application. The results showed that soil physical properties including water stable aggregates percentages and bulk density in 20 cm depth were no significantly differences among different treatments. For the soils applied with the compost at the rates of 60 and 120 tons/ha, the chemical properties including soil organic carbon content, pH, available P and available K in 20cm depth were significantly higher than those of control treatment (p< 0.05). The quantity of mineralizable N of soils applied with 120 tons/ha of compost after one year was also significantly higher than those of control treatment (p<0.05). For the soils applied the manure compost of 120 tons/ha after two years, soil microbial biomass carbon was also significantly higher than that of control treatment (p<0.05). The concentration of Cu and Zn in the soils and crops are also below the maximum permeable level after the application of hog manure compost in this study. The yields of crops growing in the soils applied with 60 or 120 tons/ha of hog manure compost were significantly higher than that of control treatment. We propose a model to assess the changes of soil quality calculating from different soil score functions (SSF) for each soil quality indicator. The results of soil quality assessment indicated that the soil quality applied with 60 or 120 tons/ha of compost were significantly better than those of applying 30 tons/ha or control treatment of compost (p<0.05).