First, the phenomenon of length
Reason: The high temperature and high humidity in the shed can easily cause the grape to grow long, the internodes become longer, and the degree of lignification becomes slower.
Solution:
1, control temperature and humidity
Through the closing and opening of the vents to control the temperature and humidity of the shed, it is recommended that the maximum shed temperature does not exceed 35 °C, and the temperature is increased by several times per day to increase the length of the shed 26~33 °C. When the temperature exceeds 33 °C, the vents are ventilated, low. At 26 °C, the venting port is closed to increase the temperature, and the effective accumulated temperature is increased to promote the early ripening effect. The temperature during the germination period is maintained at 20 to 25 ° C, the humidity is maintained at 90% or more, and the temperature is increased to 25 to 30 ° C, and the humidity is lowered to 60% to 70%, especially when 5 to 6 leaves are relatively dry.
2, reasonable pruning
Timely germination, removal of the secondary shoots, multiple picking of the Wangzhi, and flattening growth. The winter shears are trimmed with medium and short tips, and the long tip trimming is applied appropriately.
3. Rational fertilization
Strictly control the amount of nitrogen fertilizer, apply more organic fertilizer, medium and trace element fertilizer and phosphorus and potassium fertilizer, such as Zhongde bio-organic fertilizer, new friends Guigaimei and red sulphate potassium sulfate, Deful Lake instant potassium sulphate.
Second, the fruit set rate is low
Reason: The shed temperature and humidity control are unreasonable, the light is weak and the lack of quality.
Solution:
1. Control the length of the child, because the length of the grape has weakened its reproductive growth.
2, increase the light, through the switch vents timely ventilation, scrub the water droplets on the shed film, dust, enhance the transparency of the film. Conditional artificial light can be taken (using three 60-watt fluorescent lamps suspended in parallel on the plant at 45-60 cm, and filled with light for 2 to 3 hours per day) to improve the net photosynthetic efficiency of the grapes and promote the fruit setting and fruit development.
3, lay a film, increase the ground temperature.
4, boron supplementation at the flowering stage, it is recommended to spray 1500-2000 times of Kangpu liquid imported from Germany by spraying.
Third, the fruit color is poor
Reasons: The light is weak, the humidity in the shed is too large, the grape nutrition level is poor, and the temperature difference between day and night is small.
Solution:
1, try to increase the light. Purify the shed film and increase the light transmittance. The branches are placed on time, and the secondary tips are timely and reasonably topped to prevent the shade between the branches and the sheds, so as to increase the illumination. Removal of shading leaves during the coloring period, removal of shading sticks, etc. can promote coloration.
2. Reduce the humidity in the shed. Through timely and reasonable ventilation, or increase the blowing equipment in the shed, timely dehumidification is beneficial to the smooth progress of leaf photosynthesis and improve the photosynthetic products of the leaves.
3. Improve nutrition levels. Strictly control the output to ensure a reasonable load, the yield per mu is controlled within 3,000 kg, and the results of the strong branches are guaranteed, and the branches and shoots are better, and the auxiliary branches are appropriately selected. Such as Xiahe, Ju rose, Cressen, etc., the weight of the ear should not exceed 1.5 kg, the yield of mu should not exceed 3,000 kg. Rattan, sunny roses, etc., the weight of the ears should not exceed 2 kg, the yield per mu does not exceed 3,500 kg. The weight of the red grape is not more than 2.5 kg, and the yield per mu should not exceed 4,000 kg.
4. Increase the temperature difference between day and night. During the coloring period, if the temperature difference between day and night is small, it is not conducive to the accumulation and transport of photosynthetic products, and the coloring is slow. The vents can be opened at night to increase the temperature difference between day and night, which is conducive to coloring and sugar accumulation.
5. Control nitrogen and phosphorus. It is not recommended to apply nitrogen fertilizer after the second expansion period of the fruit, so as to avoid causing the vine leaves to grow, the fruit to return to green, the coloration is late, and the maturity is postponed. In the partial color change period, it is recommended that drip irrigation or ditch potassium dihydrogen phosphate and Belgium imported Defulek instant potassium sulfate, foliar spray Biocim red, can effectively promote coloration, and increase fruit flavor and quality.
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