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Effects of Organic, SEQ, Special and Conventional Farming Systems on the Yield and Quality of Differ

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Tutor: DaiJingYu;HeWenLong
School: Nanjing Agricultural College
Course: Environmental Science
Keywords: Organic farming,SEQ farming,Specially farming,Conventional farming,vegetable yie
CLC: S63
Type: Master's thesis
Year:  2011
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Abstract:
For sustainability, environmental friendly agriculture is getting more and more attention in the developing region in which the damage of the environment and the decline of crop quality by conventional agricultural practices become more evident. The study was carried out to evaluate the effects of different farming systems on yield and quality of test crops including celery, lettuce, carrot and broccoli, and soil properties.After 2 years of same management, there was a significant difference in the yield of celery and broccoli under different farming systems. Compared with Conventional farming system, the yield of celery and broccoli under Organic farming system decreased by 50.8% and 41.4%, respectively, while the yield under SEQ (Safety Environment & Quality, SEQ) and Special farming system decreased by 15.3% to 35.2%. Meanwhile, the yield of carrot under Organic, SEQ and Special farming system increased 9.5%,5.5% and 12.3%, respectively, but no significant difference was found.The vitamin C contents of Organic vegetables were 10.8%~35.2% higher than that of Conventional vegetables, and the vitamin C contents of Special vegetables were 4.6%-11.5% higher than that of Conventional vegetables. Soluble protein contents of Organic vegetables were 1.5%~26.5% lower than that of Conventional vegetables, and also lower than that of SEQ and Special vegetables. There was no distinct trend of change in nitrate content, soluble sugar and soluble dry weight among different farming systems. Vitamin C, soluble sugar and soluble dry weight of broccoli under different farming systems had reached a significant difference, but for other vegetables, there was no difference.After 2 years of same treatments, there was a significant difference in soil physical, chemical and biological properties under different farming systems. Organic soil contained the highest organic matter, total nitrogen, total phosphorus and total potassium, and followed by SEQ and Special soil. Meanwhile, soil microbial biomass carbon content in Organic, SEQ and Special soil, compared with Conventional soil, increased 48.6%,42.9% and 26.6%, respectively, and had reached a significant (P<0.05) or very significant (P <0.01) difference. In contrast to Conventional soil, soil catalase urease and invertase activities in Organic, SEQ and Special soil increased significantly, among which catalase had reached a significant (P<0.05) or very significant (P<0.01) difference.In conclusion, organic farming as revealed in this study led to lower vegetable yield but higher vegetable quality than conventional farming and sustained soil physical, chemical and biological properties. This suggested that organic farming system also led to good eco-environmental benefits. Systems like SEQ and Special farming could be taken as alternatives when all benefits including yield and quality of vegetables and soil properties, were emphasized.
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