Abstract:

In this study, the effect of water-soluble fertilizer on the internal quality of early-maturing Citrus unshiu Marc. cv. Miyagawa Wase was studied by applying it at different growth stages. The results showed that spraying elemental water-soluble fertilizers on the leaves and applying organic water-soluble fertilizers on the ground could effectively improve the internal quality of citrus fruits, such as soluble solid content and sugar-acid ratio, among which the soluble solid content and sugar-acid ratio of the fruit treated with 1 000 times of organic water-soluble fertilizers were higher than those of other treatments and CK. At the maturity of October 19th, several water-soluble fertilizer treatments can effectively promote the fruit coloring, and the color difference values L, b^* and ΔE^* were significantly higher than those of CK, which was beneficial to the early market time. Therefore, the application of a large number of elements and organic water-soluble fertilizers in the growth period of early-maturing Citrus unshiu Marc. cv. Miyagawa Wase could effectively promote the coloring of peel and improve the internal quality of fruit.

Key words: early-maturing Citrus unshiu Marc. cv. Miyagawa Wase, water-soluble fertilizer, fruit quality, coloring