Bagging can reduce pests and diseases and increase commodity value. Because Victoria grapes are yellow-green, the effect is better without bagging before ripening.
Victoria grape cultivation techniques Chang Yunjun Xu Sheng on Zhang Lianjun (Shandong Pingdu Dazeshan Agricultural Horticultural Garden 2667 13) Victoria grapes were introduced from Romania to China and planted in Europe and Asia. After several years of cultivation, it shows the advantages of large grain, beautiful color, high quality, early fruit, high yield, strong adaptability, no fruit cracking, no threshing and excellent comprehensive properties. Tender slightly yellow-green, with sparse fluff, new slightly semi-erect, green. Young leaves are yellow-green, the edges are flushed and shiny, the hairs on the back of the leaves are sparse, the mature leaves are medium-large, yellow-green, thick in the middle, nearly round, and the leaves are slightly rolled down; Leaf blade 3~5-lobed, with shallow upper fissure and deep lower fissure; Sawteeth are small and blunt; Petiole is yellow-green, and the petiole is as long as the main vein; A broad arch with a hollow and open petiole. 1 year-old mature branches are yellow-brown, and the internodes are medium long. Diploid, bisexual flower. The spike is conical or cylindrical, with an average spike weight of 730 and a maximum of 1950g. The fruit grain density is moderate, large, rectangular and beautiful, with an average grain weight of 9. 5 minutes, average diameter 2. 3 1 cm, longitudinal diameter 3. 3 cm, maximum grain weight16 g. The peel is yellow-green, the thickness is moderate, the pulp is hard and crisp, the taste is sweet and refreshing, the sugar content is above 17%, and the quality is excellent. The growth potential is moderate and the result coefficient is high. In the second year, the yield per mu can reach more than 800 kilograms. In Daze Mountain area of Pingdu, it germinated on April 8, blossomed on May 25 and matured in late July. Key points of cultivation techniques: Victoria grape with planting density of 1 grows moderately and blooms easily. In order to increase the yield of the next year and increase the planting benefit, it is best to use hedgerow cultivation and appropriately increase the planting density. In particular, the plant spacing is encrypted. If the line spacing is 1. 8 meters, plant spacing 0. Planting 5 meters, planting about 750 plants per mu. Leave 2~3 new shoots per plant in the first year of planting. If the fruiting rate is 90% in the second year, each column can bear 3~4 ears, and the yield is about 2 kg, so it can bear 1.500 kg per mu. Achieve high yield for two years in one year. In order to achieve high yield in fertilizer and water management, it is necessary to appropriately increase the amount of fertilization. Apply urea or phosphoric acid 100g before germination, 200g compound fertilizer after fruit setting, and 200g urea or hydrogen in young fruit stage, so as to facilitate rapid fruit expansion. Combination of fertilization and watering. Combined with the growth period spraying, foliar spraying 0. 2% urea and potash fertilizer for 3-4 times; Spray 2% potassium dihydrogen phosphate once every 10 day and three times before the fruit ripens to improve the sugar content of the fruit. After the fruit is harvested, furrow is opened at one side of planting ditch for topdressing every year, and 5000 kilograms of organic fertilizer is applied per mu. 3. Pruning Victoria grapes has a moderate growth potential, and natural fan pruning is the main cultivation outside the home. When pruning in winter, the combination of short and medium pruning can be adopted. Pay attention to the reasonable regeneration of branches and vines, adjust the vegetative growth and fruiting amount, and prevent the fruiting parts from moving up. 4 Flowering management Victoria grape has strong fruiting, many inflorescences and high fruit setting rate. Some inflorescences should be thinned before flowering. Generally, the coarse branch leaves 1~2 ears, the medium branch leaves 1 ear, and the fine branch is only used for non-ear regeneration. Sparse the secondary ear and pinch off the tip of the ear about 1/4. Before flowering 1 week, leave 5~6 leaves on the inflorescence for coring. 5 bags
Bagging can reduce pests and diseases and increase commodity value. Because Victoria grapes are yellow-green, the effect is better without bagging before ripening.