恭城沙田柚果实品质与土壤环境化学的研究

在恭城县城选择三不同情况的沙田柚环境（挂果好，当年产３００多个，挂果一般，当年产５０个，从不挂果，树龄已有８年，结果无望）采样，分析土壤，果实，树枝叶的常量元素和微量元素，结果表明，恭城沙田柚全糖含量平均值达１０％以上，可溶性固形物含量达１７％，柠檬酸０．３１％，糖酸比和固酸比多在３０以上。品质优的沙田柚生长的土壤Ｋ２Ｏ，Ｐ２Ｏ５含量分别为１．８００３％～２．２１２５％和０．１５２４％～０．１８１

Discussion on the Quality of Shatianyou (Citrus grandis) and Soil Environmental Chemistry in Gongcheng

The soil, fruits, leaves and twigs of Shatianyou (Citrus grandis) were collected to test macro-and micro-elements from three kinds of different environments of Gongcheng county, in which the first situation is excellent fruitage with more than 300 fruits per tree in the current year; the second one is a common fruitage with 50 fruits, and the third one hasn''t any fruits in the tree for 8 years and hopeless in the future. The results showed that the average content of sugar was more than 10%,the soluble solid state materials was 17%, citric acid was 0.31%. The ratios of sugar to acid and solid sate materials to acid were more than 30.The contents of K₂O and P₂O₅ in the soil where the good quality Shatianyou trees growed were 1.30% to 2.21% and 0.15% to 0.18%, respectively. The soil where the trees are fruitless contains more than 21.15% of Al₂O₃. The soil environmental chemistry background of the Shatianyou is La<50×10^-6, Y<30×10^-6,Pb<6×10^-6,and the element contents of the fruit-coat are La<1×10^-6, Y<5×10^-6. It is suggested that the fertilizers of Zn, Cu and B should be added more in the Shatianyou gardens of Gongcheng county area.