Analysis of turnip nutrient at different altitudes
[Objective]To clarify the influence of different altitudes on the nutrients contained in turnips and determine the best suitable growing areas for turnips,cultivation,this study provides the important basis for selecting the best suitable growing area and improving the resource utilization rate for turnip planting in the fu-ture.[Methods]In this study,13 different sources turnips were selected as test materials,the effects of turnip cultivation on their nutritional content were compared and analyzed in three different altitude areas:Xining Cit-y,Qinghai province(2,261 meters above sea level,treated by A),Guinan Conty,Tibetan Autonomoas prefec-ture,Hainan Province(3,100 meters above sea level,treated by B),and Xiaosumang Township,Yushu City,Tibetan Autonomous Prefecture,Qinghai Province(3,750 meters above sea level,treated with C).[Results]The results showed that with the increase of altitude,the soluble protein content,total sugar content,nitrite con-tent increased,nitrate content decreased,nitrate nitrogen content decreased,and water content decreased,while altitude had no significant effect on the ascorbic acid content,total antioxidant capacity and crude fiber content of turnip,which showed that under B treatment,the ascorbic acid content was higher than that in the other two regions,the total antioxidant capacity was stronger,and the crude fiber content was relatively high.Correlation analysis showed that altitude was significantly positively correlated with total sugar and nitrite content,while negatively correlated with soluble sugar and nitrate nitrogen content.Soil physical and chemical properties were correlated with the contents of soluble protein,soluble sugar,total sugar,nitrate nitrogen and nitrite.[Conclu-sion]There are significant differences in the nutrient content of turnips at different altitudes.Four materials(1,402,W30,Changdu and Yushu turnips)showed better nutrient content at 2,261 and 3,100 meters above sea level,and one material(W22)showed better nutrient content at 3,750 meters above sea level.Four of the nine nutritional indicators were significantly correlated with altitude;Soil physical and chemical properties were cor-related with nutrient content.
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