The Effect of N and KH2PO4 on Skin Color, Sugars, and Organic Acids of “Flame Seedless” Grape

Anthocyanins, soluble sugars, and organic acids play a vital role in the color flavor of grape berries. N KH2PO4 are essential nutrients for growth development. However, research on effects foliar spraying skin grapes under different levels were not systematic. In this study, “Flame seedless” used as test material. There six treatments experiment, including low nitrogen (LN), + (LNK), moderate (MN), (MNK), high (HN), (HNK). Foliar significantly increased total K, anthocyanin contents, index red (CIRG) LN, MN, HN. treatments, content methylated, acetylated, coumarylated anthocyanins MN treatment. The glucose fructose contents MNK highest compared to other treatments. sole use showed with application. Anthocyanin had significant positive correlation sugars; negative acids. Overall, 0.5% improved all levels, most effect at MN.