Abstract:

The study aims to investigate the effects of different fertilizers and fertilization frequency on vitamin C content in jujube of mountain region, and select suitable fertilization schemes for the growth of jujubes. Three jujube varieties of mountain region, Goutou jujube, Jun jujube, and Mu jujube, were used as materials to conduct different treatments with different fertilization frequency. Complex fertilizer, bio-organic fertilizer, special fertilizer of jujube, and microbial fertilizer were used at different jujube growth stages, including white ripe stage, green and red stage and mature stage. The molybdenum-blue colorimetry method was used to determine the vitamin C content of jujube at different growth and development stages. The results show that for Goutou jujube, the vitamin C content of white ripe stage reached the highest under the application of microbial fertilizer twice a year, and the vitamin C content of the jujube at the green and red stage and the mature stage was significantly increased. For Jun jujube, the vitamin C content in the green and red stage and the mature stage reached the highest under the application of microbial fertilizer twice a year, and the vitamin C content reached the highest under the application of special fertilizer of jujube twice a year during the white ripe stage. For the Mu jujube, applying special fertilizer of jujube twice a year during the white ripe stage could significantly increase the vitamin C content, and reached the best. In the green and red stage, the application of microbial fertilizer twice a year could significantly increase the vitamin C content of jujube, reaching the highest in the whole group. Applying microbial fertilizer once a year in the mature stage could increase the vitamin C content of jujube, and the effect is the best. For the three varieties of jujube, when fertilizing the jujube at different development stages, the schemes of fertilizing twice a year could obtain jujube with higher vitamin C content, and the effect of microbial fertilizer is particularly significant.

Key words: fertilization type, fertilization frequency, development period, jujube of mountain region, vitamin C