| Summary: | 碩士 === 國立中興大學 === 土壤環境科學系所 === 103 === Cultivated soil of Taiwan have low organic matter, low soil fertility and weak preserving nutrients due to high temperature and rainfall.The application of organic matter can increase soil fertility and improve soil activity. Recently, biological fertilizer can be mixed into organic fertilizer and apply soils, and that can increase beneficial microbes and improve soil fertility. The application of biological fertilizer not only promote crop growth, reduce disease, and increase the income amount to achieve improving the quality of crops.
Palygorskite have large surface area and dispersive characteristic, and that also have channel pore of high surface area and surface activity. High adsorptive activity of palygorskite can increase crop yields, reduce the heavy metal content and improve soil physical and chemical properties. The objectives of experiment studies were to add different microorganisms into palygorskite that were mixed and applied to leafy vegetables (B. r. chinensis and Brassica chinensis Linn) of pot experiment. We counted crop harvest in the yield survey and root bacteria situation, and to explore the interaction between clay minerals and microbes.
The results showed the application of palygorskite could increase crops yields in only palygorskite treatment, and the vegetable yields (B. r. chinensis and Brassica chinensis Linn) of acidified palygorskite 20 g treatment were the highest. B. r. chinensis was 68.42 g / pot and Brassica chinensis Linn was 63.87 g / pot. Two vegetable yields of mixed palygorskite and microbes treatment were more than that of palygorskite treatment, that showed microbes could promate vegetable growth. 10 g acidified palygorskite added Bacillus licheniformis treatment could cause the highest yields of vegetable (B. r. chinensis 76.73 g / pot and Brassica chinensis Linn 69.51 g / pot). In the addition of Saccharomyces cerevisiae, B. r. chinensis yields of 20 g acidified palygorskite treatment were hightest (80.07 g / pot), while Brassica chinensis Linn yields of 20 g palygorskite treatment were hightest (77.49 g / pot). Furthermore, the CPU of two microbes in rhizosphere was increasing with applied amounts of palygorskite due to microbes absorbed to nutrients of decomposed organic matter, and that increased the growth of vegetable root and shoot. The experiment results also indicated the mixed application of palygorskite and microbes apparently improved vegetable growth, and that could be applied on agricultural development with lower cost. In future, we expect the application of natural minerals coupling with microbe can make good agricultural product in Taiwan''s cultural soils.
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