The frost-free period in the north is short, only 120-150 days, the cultivation of grapes should be selected early and medium-maturing varieties, so that the fruit can be fully matured before winter, the branch buds can also be mature and safe overwintering.
If the cultivation of late-maturing varieties, the fruit in the winter before the end of the full maturity must be harvested to ensure the safety of branches and vines over the winter, the cultivation of late-maturing varieties of grapes Giant Bee, the harvest is often due to the coloring of the bad, poor quality, affecting the value of the commodity.
The following will be the main varieties are introduced as follows:
1. Lang Lang nuclear-free: also known as the Japanese nuclear-free red.
Early maturing varieties, fruit ripe in late August. Introduced from Japan.
The variety of hermaphroditic flowers, do not need to match the pollination tree can also be fruit.
The fruit spike is large, average weight of about 350 grams, the skin pink, thin skin, skin and flesh are easy to separate, the flesh is crisp, juicy, sweet and sour taste, sugar content of 14%, acid content of 0.075%, seedless, the quality of the middle and upper class.
This variety of vigorous plant growth, branch and vine maturity is good, with cold resistance, disease resistance, high yield and other advantages.
Each fruiting branch bears 1 to 2 fruiting spikes, no kernel in the fruit, is the current early-maturing varieties in the comprehensive traits of the better varieties.
Disadvantages of the skin color is lighter, lower sugar content.
Can be appropriate development from the regulation of the market.
2. Giant bee: Europe and the United States hybrid, native to Japan.
The tree is robust, branches and vines thicken faster, disease resistance, more resistant to cold, young trees early yield.
The fruit spike is large, with an average weight of 400 grams, and the grains are extremely large, with an average weight of about 10 grams, and the grains are black-purple in color when fully ripe, juicy, sweet, with strawberry flavor, and easy to separate the skin from the meat and the meat from the seeds, with a sugar content of generally more than 14%.
Jumbo varieties have great fruit, beautiful appearance, strong tree, early yield, disease resistance, cold resistance, high economic benefits, welcomed by the market and cultivators favor, has become the current cultivation of varieties.
Cultivation should pay attention to, the varieties like fertilizer, but should not be a big fertilizer and water, to increase the application of phosphorus, potassium fertilizer, nitrogen fertilizer should not be used more.
Drought resistance is poor, in the summer heat and drought, play hard to water less irrigation, to prevent leaf sunburn.
Fruitful years, to thin spikes, pinch the tip of the sequence, to prevent the berries green, immature new tips.
Because of the strong secondary fruiting power, greenhouse and greenhouse cultivation can be harvested twice.
If the management is not at the time, the bud drop is serious, and the fruit set rate is reduced.