Water-retaining agent, commonly known as super absorbent resin, is a grid-like polymer material with strong hydrophilic groups. It can not only absorb hundreds of times of non-ionized water, but also absorb it when the environment is dry. The water in the material is released and plays the role of drought resistance, water retention and soil improvement.
1 The function of water retaining agent in drought-resistant afforestation
The main function of water-retaining agent in drought-resistant afforestation is embodied in the following aspects: increase soil water content. The water-retaining agent has a strong water absorption capacity, and it is mixed in the soil to form a water-absorbing soil. The saturated water content of the soil is much higher than that of the ordinary soil, so the effective water consumption of the soil mouth is also increasing. In addition, the water retaining agent can keep for a period of time after absorbing enough water, so the trees can be continuously absorbed and utilized; the water retaining agent can promote the growth of seedlings, and the slow seedling period of the seedlings with the water retaining agent is shorter. This is because the water retaining agent can maintain the moisture of the roots of the seedlings. , Improve the soil in which it grows. Of course, pay attention to control the amount of use during the application process. If the soil moisture content is too high to increase the ground temperature, it will adversely affect the growth and development of the seedlings; it can increase the survival rate of afforestation. The water-retaining agent has strong water absorption and can quickly absorb water to form a hydrogel, thereby playing a role in water retention. After the roots of the seedlings are treated with the water-retaining agent, its
The surface of the root system will adhere to a layer of water-absorbing gel. When the soil is short of water, the water-absorbing gel will slowly release water, and the roots of the seedlings can absorb and use. When the soil moisture is full, the water-retaining agent can absorb water and save it for later use. Therefore, it can maintain the root water balance of seedlings for a long time and improve the survival rate of afforestation.
2 Afforestation application technology of water retaining agent
The water retaining agent is not only suitable for the transplantation of ordinary seedlings, but also for the transplantation of large seedlings. First apply sufficient water-retaining agent in the tree-planting hole. Before transplanting large seedlings, it also applies large-particle water-retaining agent. The water-retaining agent reaches saturation after fully soaking and absorbing water, and then fully stirs and mixes with the soil in the tree-planting hole to improve the soil Water content: During the planting process, attention should be paid to covering the surface of the tree planting hole with 3cm of crop stalks to reduce the degradation of the water retaining agent by ultraviolet rays in the sun and reduce the evaporation of the soil. The application methods of water retaining agent in drought-resistant afforestation mainly include the following:
Dip root method. The main function of applying water-retaining agent when transporting seedlings is to prevent the roots of seedlings from losing water during transportation. The specific dosage is determined by the specifications of the seedlings. When the dosage is small, use 1g of water-retaining agent and 400mL of water to make a slurry, and then mix with 600g of humus soil and 400mL of water to make a thick mud to dip the roots. For larger seedlings, if the dosage is larger, you can increase the ratio according to the above formula. You can also mix the water-retaining agent with water in a ratio of 1:100 and apply it to the root part of the entire seedling to improve the seedling’s Survival rate. Seedlings are planted in the plant holes, and then soiling, steadiness, watering, etc.; the water-retaining agent can also be evenly sprinkled around the roots of the seedlings, or mixed with ABT rooting powder, and formulated into an aqueous solution according to the ABT instructions, and then follow 1 : Mix with water retaining agent in the ratio of 100, add appropriate amount of loess to make mud for root dip;
Straight cast. The so-called direct application method is mainly to mix the water-retaining agent with the soil in the spring planting and put it directly in the plant hole according to a specific amount. Note that the mixed soil is dry soil, and then plant seedlings, cover the soil, steadfastly and water. Pay attention to the amount of water when watering;
Seed pill method. The so-called seed pill method is to mix seeds, water-retaining agent, and water in a certain proportion to form a coating liquid, stir it thoroughly, and dry in the shade, and then sowing. A large number of experimental reports show that the seed pill method can significantly improve the germination rate and survival rate of planting and afforestation;
Ditching method. This method is mainly aimed at the application of already planted seedlings. When using, first ditch both sides of the seedlings, apply the water-retaining agent in the ditch according to a specific ratio, and then pour water thoroughly. When ditching, pay attention to the depth of the ditch to be beneficial to the plant roots to absorb water. After applying the water retaining agent, water thoroughly.
3 Precautions for water retaining agent application
The application of water-retaining agent in the process of drought-resistant afforestation needs to pay attention to the following aspects: it must be fully mixed with the soil. When mixing with soil, the ratio of water-retaining agent to soil should be controlled, strictly in accordance with the technical requirements and specifications, and ensure that the water-retaining agent is fully mixed with the soil, because if the mixing is not uniform, the soil where the content of water-retaining agent is too small will not reach The role of drought resistance and water retention is required. On the contrary, if the content of water-retaining agent in the soil is too much, it may produce a paste gel. In this case, the local soil water storage is too high, which will adversely affect the aeration performance of the soil. Cause root rot, which is very detrimental to the normal growth and development of seedlings; during the application process, pay attention to that the water retaining agent can only absorb water, but cannot produce water. It cannot be used as a water generating agent, and the water retaining agent absorbs the most water It only lasts for one month. Therefore, after applying the water-retaining agent in arid areas, if there is no precipitation for a long time, it is necessary to water in time. Irrigate once every one month, otherwise it will cause the water-retaining agent to decrease the water supply capacity, such as long-term lack of water replenishment , It will completely lose the water supply capacity; it must be applied in conjunction with other water-saving measures. In the process of drought-resistant afforestation, the application of water-retaining agent is only a water-saving measure, not the only water-saving measure for drought-resistant afforestation. Therefore, it must be combined with other water-saving measures to achieve more significant water-saving effects. Drought-resistant and water-retaining agents can effectively maintain precipitation and irrigation water in the soil, reduce soil water evaporation, and increase soil moisture content. Improving the water supply capacity of the soil to the trees has a certain water-saving and drought-resistant effect. Each 667m2 can save 900 ~ 1500m3 of water. The water-saving effect is more significant, so it has a higher application value in drought-resistant afforestation.