1. Choose different types of water-retaining agents for different purposes
All water-retaining agents have a certain broad spectrum, but this does not mean that they can be used arbitrarily. For those applied to the soil and for storing rainwater, water-retaining agents with granular and high gel strength should be selected; for seedlings that need to be dipped in roots, transplanting, and dressing, etc., which need to improve the survival rate of trees, powder and gel strength should be selected. Not necessarily high water retention agent.
2. Pay attention to the application time and soil moisture conditions
Water-retaining agent is not a water-making agent. It is best if the soil water content is higher than 5% of the critical moisture for emergence, otherwise it will reduce the emergence rate. The application of water-retaining agent is mainly to increase the water storage capacity of the soil and adjust the contradiction between rainwater and crop water demand to achieve a significant increase in production. However, in areas where water can be supplied in time in the middle and late stages of crop growth, the effect of increasing production is not very strong. The application should be adapted to local conditions.
Three, selection criteria
When selecting a water-retaining agent, the water-absorbing multiple of the water-retaining agent cannot be used as the criterion for quality evaluation, but the amount of effective water absorbed should be used as the criterion. The stability of the product should be paid attention to in use. Generally, it can absorb more than 100 times of soil water.
4. Pay attention to moisture and sun protection during storage
The water-retaining agent can absorb moisture in the air and agglomerate in the packaging, causing inconvenience to use, but the moisture-absorbing agent does not affect its quality. The water-retaining agent will degrade quickly when exposed to strong ultraviolet rays, which will seriously affect its service life and effect. Avoid long-term sunlight exposure during transportation and storage.
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