Wood vines. Branchlets cylindrical, longitudinally ribbed, glabrous or sparsely pilose. Tendrils are 2-branched, opposite to leaves at intervals of 2 nodes.
The fruit is spherical or oval, with a diameter of1.5-2cm; Seeds obovate, short and round at the top and short beak at the base. Umbilical cord is oval, located in the middle of the back of the seed, with slightly raised ridge on the ventral surface and wide furrows on both sides, reaching 1/4 of the seed. The flowering period is April-May and the fruiting period is August-September.
Extended data
Grape cultivation requirements:
1, temperature
The lowest temperature for grape growth is about 12℃- 15℃, the lowest ground temperature is about 10℃- 13℃, the optimum temperature for flowering is about 20℃, and the optimum temperature for fruit expansion is 20℃-30℃. If the temperature difference between day and night is large, the coloring and sugar content are better.
Step 2: Moisture
Grapes have a high demand for water, and strictly controlling the water in the soil is the premise of planting grapes well. Grapes need more water in the early growth stage or vegetative growth stage, and less water in the late growth stage or fruiting stage, so it is necessary to avoid damaging the root system so as not to affect the quality. Grapes shelter from the rain. It has been raining for many years, which easily leads to insufficient sunshine and limited photosynthesis.
3. Lighting equipment
Grapes must have a certain intensity of light in the normal growth process, but when the light is too strong, especially when the grapes enter the hard core stage, it is more prone to sunburn. At this time, you can try to keep bagging or leaves to cover the grapes.
When the sunshine is insufficient, it is easy to cause poor corolla shedding at flowering stage and low fertilization rate; In the stage of flower bud differentiation, flower bud differentiation is poor and parthenocarpy is more; In the growing period, the plants are long and the internodes are long. Not bearing fruit or parthenocarpy; Diseases and poor quality in fruit expansion period; When ripe, the color is not good and the sugar content is reduced.
4. Land
Although grapes can be planted in various soils (improved), loam and fine sand loam are the best. Although sandy soil has good air permeability, its ability of retaining fertilizer and water is poor. Loam is between sandy soil and clay.
It has strong water and fertilizer retention capacity, and most of them are very fertile. Grapes are easy to blossom and parthenocarpy when they grow vigorously, and have good fruit and high yield under high temperature and light conditions. There is less sunshine at low temperature, the result is not very good and the yield is low; Pay attention to drainage at ordinary times, avoid exploratory tillage, prune lightly in winter, prune more in summer, and spray borax, potassium dihydrogen phosphate and calcium superphosphate.
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