In the summer and autumn, grass seedlings are planted. For various reasons, “light board”, “burning seedlings”, “yellow seedlings” and “sudden death” often occur, resulting in lack of seedlings, weak seedlings, and inability to grow seedlings in time, thereby affecting cultivation. The causes and solutions are as follows:
First, "light board" in the emergence period, the local emergence of seedlings or poor emergence.

1. The reason is that seed germination rate is low; seedlings use matrix rich in fat, and the seeds are burned to death after germination; cover soil is too thick, young shoots cannot break soil to emerge; seedlings are not enough and seedlings die.

2. To prevent the selection of seeds or naked seeds of good coating, germination test before sowing, and determine the seeding rate according to the germination. Rational deployment of the substrate must not add uncontaminated raw manure, and the use of unfermented manure after emergence is strictly prohibited. Appropriately cover soil to two or three times the thickness of the seed, for example, no more than 2 mm. Before the planting, the water must be poured repeatedly.

Second, "burning seedlings" due to fermentation of the manure in the matrix or high temperatures cause burning seedlings.

1. Causes of application of raw feces, gray spots on the surface of the substrate can be found; high temperature, high temperature and humidity in the noon bed during sunny days.

2. The prevention of the application of fully fermented and cooked organic fertilizer can be used to slowly rinse the water when the seedling is lightly burned. The temperature in the seedbed is controlled, and the temperature in the shed is controlled below 30°C. Above 35°C, ventilation should be slowly expanded and gradually cooled.

Third, "Huang Miao"

1. Causes of overburdened soil, excessive nutrient consumption during emergence; too much or too little water leads to difficulty in water absorption in roots; overheating or too low temperature due to improper coverage.

2. To prevent the early attention to temperature and moisture, suitable soil after sowing, watering to spray as well, to prevent the temperature is too high or too low. Mid-term timely fertilizer, should be sprayed with 0.1% urea and 0.3% of potassium dihydrogen phosphate, pay attention to drainage and watering. Late flood irrigation can not be too early, if there are yellow seedlings, timely application of foliar fertilizer such as 0.1% of urea.

Fourth, "suddenly die"

1. Causes Caused by a bacterial infection, specific: "Blight" is caused by Rhizoctonia solani, and "Phytophthora disease" is mainly caused by Pythium aphanidermatum fungus.

2. To prevent seed soaking, 0.5% potassium permanganate can be used to soak seeds for 2 hours. Seed dressing, seed dressing with a seed weight of 0.3% of 50% thiram wettable powder. The soil was sterilized and mixed with 7 to 70% of Trisone and 70% of pentachloronitrobenzene 1 : 1 and then applied at 8 to 10 g/m 2 plus 100 times fine soil. Strengthen the seedling management, timely ventilation and light, and maintain the appropriate temperature and humidity. Sprayed with pesticides, the disease was found to be sprayed with 20% methyl-rhizophos powder 200-fold solution or 95% dieffenone soluble powder 500-fold solution.

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