关键词: 钾, 甜柿, 单果重, 可溶性糖, 有机酸

Abstract: This paper analyzed the effects  potassium content of leaf and fruits on single fruit weight and sugar acid metabolism by using the sweet persimmon cultivar ‘Taishuu’ as test materials. The results showed that: potassium content in leaf had a significant effect on single fruit weight, while the potassium content in fruit considerably affected the content of sugar and acid components. The single fruit weight was significantly linearly related to the potassium content in leaf, and the potassium in leaf was one of the sources of potassium required for fruit enlargement. During fruit mature period, the potassium content of leaf in the range of 6.4 to 9.6 mg·g-1 could promote the increasing of single fruit weight. The potassium content of fruit in the range of 4.6 to 4.8 mg·g-1 could promote synthesis of glucose and fructose in fruit, and the potassium content of fruit in the range of 4.4 to 4.6 mg·g-1 was conducive to inhibit the accumulation of organic acids. After comprehensive consideration, the appropriate ranges of potassium content in leaf and fruit were 6.4 to 9.6 mg·g-1 and 4.6 to 4.8 mg·g-1 respectively during fruit mature period.

Key words: potassium, sweet persimmon, single fruit weight, soluble sugar, organic acid