Compost technology is a valuable tool already being used to increase yields and improve soil fertilities. However, little is known about how the
decomposed cow dung affects
vegetable quality and rhizosphere soil fertilities. Effects of differently treated organic
fertilizers on the quality of vegetables and soil
fertilities were investigated by pot experiments with
cabbage and pepper. The results showed that
nitrate contents in cabbage and pepper decreased by 19%~45.3% and 13.4%~35.8%, respectively, compared to those in the control after application of decomposed cow dung for 40 days, and Vc contents increased by 13.7%~25%(cabbage) and 19.8%~37.3%(pepper). But the un-decomposed organic fertilizers (fresh or dry cow dung) could not obviously decrease the nitrate contents or increase the Vc contents in cabbage and pepper compared to those in the control. In addition, the contents of available P and K in the rhizosphere soils of cabbage and pepper were obviously increased after application of
organic fertilizer decomposed by selective microbial flora compared to the control, and increased organic matter was also obtained in the rhizosphere soils of cabbage and pepper.
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