Sapphire fertilization management scheme
1, flowering period
It takes about 5~ 14 days from the beginning to the end of flowering. The suitable temperature for flowering is 25~32℃. If the temperature is lower than 15℃, normal flowering and fertilization will not be possible. Therefore, it is necessary to apply fertilizer containing fulvic acid before and after flowering to promote fertilization and fruit setting. In addition, it is necessary to tie vines, pick cores in time, remove secondary branches, improve ventilation and light transmission conditions, and artificially pollinate poorly pollinated ears.
(1) Fertilization and watering
Spraying Ribelli bird's nest chelated boron fertilizer five days before grape flowering to promote flower and fruit protection, control the wild growth of cuttings and improve the fruit setting rate. In addition, the supply of fertilizer and water should be properly controlled. ?
(2) Picking inflorescences
Before flowering, remove the inflorescence from the weak branch and leave an inflorescence on the moderately growing branch.
(3) Pruning flower branches, removing the shoulder of inflorescence, and removing 1/5 at the top of inflorescence 3-5 days before flowering.
(4) In addition to the tendrils, the tendrils of new buds should be pinched off as soon as possible, and the new buds should be fastened and fixed in time to avoid wind damage.
(5) Before flowering, spray Bordeaux mixture or carbendazim and chlorantraniliprole to control diseases such as gray mold and black pox and pests such as cicadas.
2. During the berry growing period, the growth time of berries is probably from the beginning of ovary to softening and coloring. During this period, nutrient consumption is high, so it is necessary to increase the application of nitrogen, potassium, calcium, boron, manganese and zinc fertilizers in time, apply 2~5 kilograms of water fertilizer per mu, and spray foliar fertilizer 2~3 times at the same time, which can promote fruit expansion, coloring, sweetening and weight gain.
3. The ripening period of berries from softening and coloring to full maturity is about 20~30 days. At this time, the volume of berries no longer increases significantly. Mainly due to the accumulation and transformation of nutrients, the color on the fruit becomes soft, the acidity decreases and the sugar increases.