During the hot and dry season, vegetable seedlings are prone to failure. The lessons of previous failures are mainly manifested in the following aspects and should be avoided as much as possible.
Seeds do not germinate. The reason for this is that the seeds themselves are problematic and belong to the seeds of Chen or those that have lost their ability to germinate. If the temperature is too high, some vegetable seeds need to be treated with low temperature to germinate normally, such as lettuce seeds and garlic seeds. The environment is too dry. In summer and autumn, there is often a lot of southerly winds, and the seeds do not always keep moist and cannot germinate normally. The application of fertilizers and pesticides at seedbeds is too high and the seeds lose their ability to germinate. Solution: Select good quality fresh seeds for the breeding unit; use the correct germination method. The need for low-temperature germination must be refrigerated and treated at low temperatures. In the case of high-temperature southerly winds, shaded sheds, covered shade nets, covered straw, and well-drained water should be used for cooling and moisturizing. At the same time, avoid using high concentrations of human and animal manure and chemical fertilizers.
Improper ground cover. Overly thick soil, too thick and easy to cause seedlings late seedlings, seedlings, small old seedlings; overlying soil, too dry, easy to appear capped seedlings, rooted seedlings, seedlings. Seeding soil after sowing is generally required to 1.5 to 2 cm thick, large-grained seed cover soil 2 to 3 cm thick, and planting seedbeds before planting should be enough water to keep the seedbed moist before and after emergence.
Maturation is not timely. After the emergence of hardening seedlings too early, too long, easy to burn the seedlings and even burning dead seedlings; hardening seedlings too late, too short time, prone to seedlings are thin, thin seedlings. The correct method is: After 80% of emergence, timely uncover the cover and put up the shade. After 10:00 in the morning and after 4 in the afternoon, the seedlings will be hardened. Each time the seedlings will be cultivated for 2 hours, and the first true leaf will appear gradually. Increase the time for hardening seedlings, so that it can be refined but not excessive, and attention should be paid to preventing strong winds from blowing and strong sunlight and long sun. One week before transplanting, open the shed to naturally plant seedlings.
Improper fertilization. The application of unripe organic fertilizers on seedbeds is prone to burning roots and dead seedlings; after seedlings, the topdressing is too thick and it is easy to burn young shoots prematurely. Note that the proportion of organic fertilizer and seedbed soil in the seedbed is generally 1:1. Two true leaves are generally not to be topdressed, and two true leaves can be applied after 4 o'clock in the afternoon with diluted manure or diluted methane water. Generally do not try to use chemical fertilizer topdressing.
Poor water management. If the long-term high temperature and dry, to every day before 10 o'clock in the afternoon, after 4 o'clock in the afternoon poured water, each watering should not be excessive, keep the seedbed moist state. If there is long-term rain, the ditch should be drained around the seedbeds, and the conditions can be covered with rain canopy.
Disease dead seedlings. Seedbeds often have blight, anthrax, damping-off, and blight. They are available with 25% metalaxyl wettable powder 800 times, or 50% carbendazim WP 1000 times, or 70% thiophanate-methyl 1000 times. Liquid control.
Pest killed. Seedling common small tigers, can be caught in the morning and early evening, but also can use 1.5 to 2 kilograms of 2.5% trichlorfon powder to add 10 kilograms of fine soil made of toxic soil, sprinkle poisoning around the plant . When the seedlings are damaged by rakes, rakes, etc., 500 g of furanide is applied to the seedbed per acre.
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