Rehmannia glutinosa requires different moisture in all stages of growth and development. The germination requires a certain amount of water. When the soil moisture content is 15% to 25%, the plantlets can germinate, and the ground yellow is suitable for astragalus (soil moisture content 15%~20%). The experience of the vast majority of drug farmers is: the soil is held in groups and thrown to the ground. The roots of soil that are too wet have poor growth, and too much drought affects the growth of the whole plant. Timely and proper watering is the key technology in the production of Rehmannia glutinosa. The people in the production areas concluded that “three waters and three waters are not pouredâ€, that is, watering after fertilization, long drought and no rain water, and well water after summer rainstorm; Watering, no watering in the hot sun at noon, no watering when the sky is cloudy. When watering, it is necessary to prevent muddy water from contaminating the leaves and leaves and prevent the accumulation of water in the field, so as to avoid local over-moisture caused by water accumulation. In the summer when the volt temperature high temperature should pay special attention, improper watering at this time, can easily cause high temperature and humidity environment, easy to induce root rot of yellow, blight, disease and other diseases, resulting in reduced or even no harvest. Whether or not the ground yellow is watered in the volt is mainly to observe the growth state of the ground yellow under the condition of soil drought, and decide with the weather forecast.
The principle is: During the day when the sun is very strong, the leaves of yellow plants are wilting. At night, when the weather is cool, the leaves can stand upright the next morning and they can not water the plants. If the morning leaves cannot stand up, consider watering properly. In the absence of moderate to heavy rain for the next three days, watering may be appropriate.
Because yellow earth is afraid of earthworms, it is necessary to pay attention to drainage work during production. Especially in the summer, waterlogging in the field of yellow earth will cause root rot, blight or epidemic, and even cause a large area of ​​death.
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