During the cucumber growing period in the solar greenhouse, due to the influence of water, fertilizer, temperature, light and diseases, abnormal phenomena occur. Several abnormal phenomenon manifestations and prevention techniques are described as follows:
Flower topping
The top of the flower is the top of the melon, and the melon vine grows in a contraction, the leaf color is dark green, the young melons rise, and the growth point is higher. The reproductive growth and vegetative growth are also hampered. Such vines are caused by excessive one-time fertilization (especially nitrogen fertilizers) or excessive spraying of pesticides. Management should take three measures: First, re-cast a water, with the water applied a small amount of human urine excretion; the second is to spray a low concentration of gibberellin at the growth point; three is top dressing, a small number of times.
Melon skin yellowing
When the cucumber is in a prosperous period, the leaves are large, grow fast, and produce high yields, but the rind tends to yellow, which reduces the value of the commodity. Melon yellow is caused by lack of nitrogen and iron deficiency, and the measures that should be taken are as follows: First, 5 kg of ferrous sulfate sulphate; Second, spraying multi-element liquid fertilizer (iron) on the foliar surface to make the melon skin yellow green.
Lack of guaranty
The vines are black-green leaves with a diameter of up to 20 cm from the top to the bottom, a stem diameter of more than 1.2 cm, and a very small number of melons. This symptom is caused by too much N fertilizer and insufficient P and K fertilizer. Measures to be taken: First, no nitrogen fertilizer such as ammonium nitrate, ammonium bicarbonate or urea shall be applied or less applied within 20 days; secondly, compound fertilizers such as nitrate phosphate or diammonium phosphate shall be re-applied immediately. After 5 to 10 days and 10 to 15 kilograms, the fruit will be full after 10 days.
Cancer
The melons are melons but not long, and the young melons turn yellow and soft, rot or fall. Melon reason:
First, organic basal fertilizer is applied in a small amount, nitrogen fertilizer is insufficient, and pods are malnutrition; second, leaf sensation, especially gray mold, photosynthesis is weakened; third, indoor temperature is too high, and photosynthesis is unbalanced; fourth, the root melon and the lower part Picking is not timely, nutrition can not be redistributed; Fifth, lack of light. In short, it is all due to imbalances in nutrition supply and demand. This disease should be re-applied nitrogen fertilizer. Vanilla vinegar leaves can be quickly spread leaves broad and strong; Shiba ammonium leaves large and thin and yellow can quickly make leaves dark green. Prevent disease early, timely spraying; early cover the cover film, to prevent high temperature and high humidity scars; daytime room temperature control at 24 ~ 28 °C, no more than 30 °C, night control at 14 ~ 18 °C; root melon to Picking early, when the melon flower begins to wilt, it will be picked, which can reduce the melon.
Crisp leaf disease
The leaf color is dark green and dry and wrinkled. The leaf margin is sagging, the finger bullets are broken, and the melon strips are small and small. This is caused by too little organic base fertilizer and monotonous top dressing. Before the planting, chicken manure and cake fertilizer should be applied. Fertilizer and manure should be applied alternately. The leaves should be sprayed with 300 times of vinegar. If a small amount of harvest is added, the photosynthetic capacity of the leaves can be increased.
Dry leaf disease
One is the storm. For example, before March, the temperature of the wind changed greatly, such as the wilting of leaves at noon in the air vents, and chlorosis and dryness were the typhoons after 3 days;
The second is heat damage. After March, the temperature in the shed was as high as 40°C. The leaves in the middle and front of the vine and the leaves in the vicinity of the shed film were easily dried up. The third was phytotoxicity. Insufficient spray concentration or improper use can cause all vines to wilted. The remedy is: no matter what causes the wilting of the leaves, immediately spray water on the leaf surface, or rinse the leaves, spray water for 3 to 5 hours, and then spray the harvest number 1, which will help restore the function of the leaves.
Disease
Sunlight Greenhouse Cucumbers are susceptible to blight (water-stained patches and rotten heads) in the early stages due to low temperature and low humidity, medium-temperature high-temperature and high-humidity susceptibility to gray mold (gray black hair and rotten melon) and powdery mildew (white pilus). Late high-temperature susceptible to downy mildew (foliage beige spots) and bacterial angular spot.
The comprehensive prevention and control measures are: spraying gray mold, quick keratin or triadimefon from mid-November to February of next year, and the environment within the shed is relatively dry. Spraying triadimefon and Garrinone every 7 days after March to prevent powdery mildew and downy mildew. When the downy mildew occurs seriously, a 1:1:240 Bordeaux mixture can be used for foliar spraying.
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