Xinjiang is an important melon producing area in our country, with a melon planting area of 56.90 thousand hectares, accounting for 14.94% of the national planting area. However, at this stage, the overall quality of melons in Xinjiang is not high, and the planting efficiency continues to decline.

Potassium fulvic acid is a pure natural mineral active potassium elemental fertilizer that plays an important role in regulating plant growth, improving fertilizer utilization, improving soil fertility and biochemical traits, enhancing crop stress resistance, promoting plant nutrient absorption, improving crop quality and increasing fruit yield.

Zinc fulvic acid is essentially zinc fulvic acid, which is formed by the chelatation of fulvic acid and divalent zinc elements, which combines the dual effects of fulvic acid and zinc on plants.

The melon entered the initial stage of reproductive growth at the flowering and fruit setting stage, 22.5kg/ha, and the mass of dried matter of flowers and fruits was the largest, indicating that the application of an appropriate amount of potassium fulvic acid could effectively increase the accumulation of dry matter of flowers and fruits.

During the fruit expansion stage, the weight of melon leaves, stems and roots with 22.5kg/ha of potassium fulvicate reached the maximum, which was significantly higher than that without potassium fulvicate, indicating that the application of an appropriate amount of potassium fulvicate was beneficial to the increase of dry matter mass of melon.

Under different dosages of zinc fulvic acid, the dry matter allocation of melon organs gradually increased with the advancement of growth process. In the flowering and fruit setting stage and fruit expansion stage, zinc fulvic acid treatments effectively promoted the growth and development of melon fruits. The results showed that the increase of zinc fulvic acid had a positive effect on the formation of melon yield in the later stage.

Under the same application rate, the quality of dried melon treated with zinc fulvicate was higher than that of potassium fulvic treatment during fruit expansion.

Among them, the dry matter mass was the largest when the application rate of zinc fulvic acid was 37.5kg/ha.

The weight of single melons and the sugar content in the center of melons treated with different application rates of humic acid potassium showed significant differences. As the application rate of humic acid potassium increased, the marginal sugar content first increased and then decreased, while the total sugar content increased with the application rate. However, the change in total acid content was not significant, and the vitamin C content also first increased and then decreased. Overall, an application rate of 22.5 kg/ha of humic acid potassium had the best effect on improving fruit quality.

Under different dosages of zinc fulvic acid treatment, with the increase of zinc fulvic acid application rate, the weight of melon showed a gradual upward trend, and the longitudinal diameter, transverse diameter, vitamin C content and total sugar content were the largest at 22.5kg/ha.

Under different dosages of potassium fulvic acid, the yield of melon increased first and then decreased with the increase of potassium fulvic acid application. The yield is the largest at 22.5kg/ha and 37.5kg/ha.

Under different dosages of zinc fulvic acid, the yield of melon increased first and then decreased with the increase of zinc fulvic acid application. When the zinc fulvic acid was used at 22.5kg/ha, the melon yield was the largest.

It can be seen that the yield of melon increases first and then decreases with the increase of potassium fulvic acid and zinc fulvic acid application rate, that is, when a certain application rate is reached, the melon yield will reach its peak, and the application rate will continue to increase, and the melon yield will begin to decline. There was no significant difference in melon yield between potassium fulvicate and zinc fulvic treatment under the same application rate.

With the increase of potassium fulvic acid and zinc fulvic acid application rate, melon yield, refractose and vitamin C content showed a trend of increasing first and then decreasing. When the application rate of potassium fulvicate and zinc fulvicate was 22.5kg/ha/time, the melon yield reached the maximum, while the melon edge sugar, center sugar longitudinal diameter, transverse diameter, total sugar and vitamin C content reached the highest level, so it was recommended to control the application rate of potassium fulvicate and zinc fulvicate at about 22.5 kg/ha/time in melon production.