The reasons why the vine grows weak are as follows:
1. The soil is compacted, the groundwater level is high, and the orchard is densely planted.
If all the above three items are occupied, the grape root system will certainly not be good, then the absorption quality of the root system will be poor, and the quality of the nutrient reserve will be poor. The nutrient reserve of the whole orchard is insufficient, and the growth of the grapes in the second year will certainly not be prosperous.
2. Root failure due to illness, insects, and deficiency.
Due to the disease: The most common grape root tube disease is the first root rot disease, the second root cancer. Root cancer is a bacterial disease. The main symptom is the formation of a relatively large tumor-like substance in the rhizome. Root rot is the root system due to the infestation of various diseases, the roots are black, gray, and the capillary roots rot and disappear. There is also a root-knot nematode, the whole root is like a pearl necklace, and a fine root is composed of a large and small small spherical material.
Insects: The first common in the north is the nodule. If there is a problem with the nodule in the orchard, the leaves will turn yellow when the spring is germinated. The second one is cockroach, golden worm, and ground tiger. In particular, a large amount of unfertilized cattle and sheep manure, especially sheep manure, is used. The fiber content is relatively high and it is most likely to breed these pests.
Due to deficiency: the most important factor in the deficiency of roots is calcium deficiency. If there is calcium deficiency, we will dig out the roots and see that there is basically no problem. If you look closely, you will find that the capillary roots are too short, too thick, and too thin. These are caused by calcium deficiency, which seems to be okay, but the quality of the capillary root is very poor.
The common manifestation of root failure caused by disease, insects and deficiency is: after spring germination, the leaves are yellow when they are unfolded, the new shoots are too fine, and the sprouts are extremely irregular. Regarding the problem of pests and diseases in the soil, it is currently a difficult problem in fruit trees.
Prevention and control of roots and stems
Root cancer is a bacterial disease. At present, there is no particularly good ingredient for root cancer. Here, we can only recommend a chlorobromoisocyanuric acid. This medicine is considered to be effective in preventing bacterial diseases. Better ingredients. It is found that which piece of cancer is more serious and can be diluted with 5% chlorobromoisocyanuric acid 600-800 times and then rooted. If the whole garden is more serious, and the individual thinks that there is no value for re-operation, and after the garden is destroyed, it is better to choose the grafted seedling of SO4 because its anti-root tumor disease effect is better.
Regarding root-knot nematodes and root rot, there are no effective agents, mainly using organic fertilizers, and controlling less use of chemical fertilizers to adjust the pH of the soil as long as the soil is not severely acidic and has good permeability. High organic matter content, the incidence of this disease is small. It has been suggested that the use of functional microbial fertilizer to control the disease of grape roots and stems is actually adding beneficial bacteria to the soil, and expecting beneficial bacteria to breed and inhibit harmful bacteria. However, after the microbes enter the soil, they depend on the organic matter in the soil. If the organic matter content in the soil is low, the microbial fertilizer alone can be used, and the bacteria can not survive if they do not eat after entering the soil.
Regarding the root tumors, cockroaches, and golden worms, the same method can be used: the roots are irrigated with thiamethoxam before germination, and the effective ingredient per acre is guaranteed to be about 200g. What is the concept? The cheapest one on the market is 25% water-dispersible granules. One kilogram of land is used for 1 kilogram. After the water is turned on, it is either a dropper or a flood irrigation, which is equivalent to pouring the medicine into the germination water. Moreover, the effect of thiamethoxam is better. After the root is absorbed, the agent can be transmitted to the ground through the root system to prevent the aphids, blind mites and other sucking mouthparts pests, but thiamethoxam is not effective against the tiger. For the effect of the tiger, it is recommended to use organic phosphorus granules, such as chlorpyrifos granules. This anti-gold worm has a general effect, but the anti-ground tiger effect is better.
3. The leaf curtain area is limited.
Either the leaves are too small and the synthetic nutrients are not enough. Or leave too much leaf and block each other. The following leaves do not see light, can not carry out photosynthesis, only consume nutrients; the above leaves can see light, although it can synthesize nutrients, but not enough for the following leaves. Fundamentally, nutrients are not stored. This involves a reasonable colonization problem. A requirement for colonization: the rack blades are full but not obscured.
4. The continuous load is too large, or the fertilizer is not timely.
It is clear that only the nutrients of four thousand pounds of fruit are provided, but the tree is required to hang up five or six kilograms of output, and the tree has been overdrawn for years, surely the tree is weak.
It is not appropriate to use fertilizer in time. After applying fertilizer to the fruit trees, the roots absorb these mineral elements and send them up to the leaves. The photosynthesis is used to convert the fertilizer into nutrients, and the nutrients are synthesized and sent to the roots. The roots are the reserves and distribution centers of nutrients, and the roots distribute nutrients to each. Organs, this process takes at least half a month, which means that it takes at least 10 days from the day when the roots are used for fertilizer, and it takes at least 10 days. This is why it is necessary to topdress in advance and use fertilizer in time.
5, winter frost damage.
In the winter of 15 years and the spring of 16 years, the quality of the leaves after the germination is basically unbearable.
These are the reasons why our common orchard is weak. The minimum requirement for ensuring the tree is to use the base fertilizer. The application time should be the earliest when the maximum temperature during the day falls below 30 degrees. Because the temperature is too high, the leaf stomata are closed, the photosynthesis is stopped, the fertilizer is used, and the nutrient is not converted. It takes about a month before the leaves to fall, because it takes at least a month for the nutrients to return completely to the fruit trees from the time you use fertilizer to the nutrients.
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