关键词: 兰州大尾羊, 兰州大尾羊, 蒙古羊, 脂尾, 脂肪, 沉积分布

Abstract: To investigate the effect of soil nutrients on tree nutrients and fruit quality in Bingtang sweet orange orchard, the soil, leaf, fruit mineral nutrients and the quality of fruits in 9 representative orchards of Mayang County, Hunan Province, had been analyzed during 2011-2015. The results showed that the soil pH of Mayang County was close to the optimum values. The contents of soil organic matter, most macronutrients and micronutrients were optimum or excessive, while the soil available Zn content was significantly low. In the leaves of Bingtang sweet orange tree, N, Mn, Cu, B and Mo contents were optimum, P and Fe contents were excessive, but K, Zn, Ca and Mg contents were lacked. There were great differences of nutrients among the trees in different orchards. Fruits exhibited relatively high N and K contents which were consistent with N and K contents in soil and leaves. Among the representative orchards in Mayang County, Bingtang sweet oranges showed significant difference in fruit-size. The diameter of fruit was positively correlated with the thickness of fruit-peel but negatively with fruit TSS and VC content. Soil Mn and Ca contents showed significantly positive correlation with that in leaves, but soil P was negatively correlated with P content in leaves. The contents of K exhibited significantly positive correlation between leaf and fruit.