As a health-care vegetable, garlic has its unique odor. Because it also has anti-cancer effect and efficacy, it is very popular among consumers and is popular in the north. The market demand for garlic has increased year by year. More and more farmers choose to grow garlic. However, in the near future, farmers have responded to the phenomenon of yellow tips, yellow leaves and dryness in garlic leaves. Why is this? How to prevent it?
First, the yellow tip of the garlic leaves
1, symptom performance
When the garlic plants grow to 4-6 leaves, the tip of the leaves appears yellow, which is the "yellow tip".
2, induced factors
(1) Dry rotten, the yellow tip of the plant is the end of the withdrawal of the mother, indicating that the nutrients in the garlic are consumed, and the nutrients are absorbed by the roots, but the plant needs are not met, so the yellow tip will appear, but this is a normal Physiological phenomenon.
(2) Wet rot, high soil moisture, or soil return to alkali, there is a hazard, which can aggravate the occurrence of "yellow tip".
3. Prevention measures
(1) Timely topdressing and watering. When the garlic is harvested in the autumn, every mu of land can be ditched and applied with 1000-1500 kg of decomposed organic fertilizer, or 15-25 kg of urea, covered with soil and watered in time. The spring sowing garlic is best to be topdressed and watered between 35-40 days after sowing. Covered garlic watering and applying compound fertilizer.
(2) When watering the alkali in the spring, if it is found that the ground in the field is whitish (the soil returns to alkali), it is necessary to timely water the alkali, and to cultivate and protect the soil.
(3) Prevention and control of pests and early attention to prevention and control.
4, matters needing attention
(1) The type of returning mother type of garlic has two types: dry and wet.
(2) Returning alkali to the ground The alkali returning to the ground will erode the garlic, causing the garlic to smell and attract the flies to lay eggs and suffer damage.
Second, the leaves of garlic appear yellow leaves and dryness
1, symptom performance
The tip of the damaged plant turns purple-red, and gradually develops along the leaf vein to the leaf sheath. It loses green and turns yellow. When it is serious, the whole leaf is dry and dead, and the root system is dysplastic and easy to die. The plants are obviously dwarfed, the garlic is short and thin, and the heavy ones cannot be twitched. The diameter of the garlic is about 5 cm. Generally, it is manifested at the end of February to the beginning of March. The initial yellow leaf spots occur, and yellow leaves occur in the whole field after 2 to 3 years.
2, induced factors
(1) Deterioration of soil ecological conditions such as flail cultivation. Or soil compaction, or salinization. Or partial application of chemical fertilizers, neglecting the application of organic fertilizers and micro-fertilizers.
(2) Soil moisture is not suitable, such as high temperature in winter, less precipitation, resulting in poor soil moisture, or high soil moisture.
(3) The plants are frozen by freezing the cold due to multiple cold currents.
(4) Pests and diseases are harmful to the pests in the field, and are likely to cause yellow leaves and dryness.
3. Prevention measures
(1) Choose high-quality garlic to choose no harm and no disease, white garlic with a single grain weight of 5 grams or more to make garlic, when the soil moisture is large, cultivating and cultivating, and timely sealing the east.
(2) Carry out the rotation, do not repeat the planting. It is best to be 25-30 cm with wheat, corn, melons, beans and solanaceous fruit. Three-year rotation of crops such as body and potato, rational application of base fertilizer and deep cultivation of land, (3) seeding period is carried out at a daily average temperature of 2-22, and the seasoning of covered garlic is delayed by 7~. 10 days, before the winter, the seedlings should reach the standard of strong seedlings.
(3) Adjust the soil moisture water, and then cultivate and keep the water after watering.
(4) Timely watering and topdressing After the spring return to green, in the formation period of garlic and garlic, timely combination of watering and topdressing.
(5) Prevention and control of pests and diseases Early attention to prevention and control of various pests and diseases.
4, matters needing attention
(1) In some areas of normal yellow leaves, when it enters the winter, the yellow leaves and dry tips will appear in the garlic.
(2) lack of trace elements yellow leaves such as calcium deficiency, magnesium and other elements, can also cause yellow leaves
(3) Phytotoxicity Yellow leaves use excessive herbicides (such as acetochlor) before emergence of garlic. It is easy to cause leaf growth to be inhibited, chlorotic and yellow, individual heart leaves are twisted, roots are reduced, and garlic is smaller.
The above are the causes and prevention measures of yellow tip, yellow leaf and dryness in garlic leaves. When planting garlic, farmers should pay attention to the above matters to avoid the phenomenon of yellow tip, yellow leaf and dryness. If found, it must be treated in time. .
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