How to solve the problem of rotten seedlings of early rice caused by changeable weather

In the early rice seedling raising season, we often encounter low temperature cold wave or rainy weather, so the improper management of the water layer in the early rice seedling field can lead to the decrease of the root absorptive capacity of the seedling, the imbalance of water up and down the seedling body, and the pathogen also invades when the seedling body is weak, thus causing the early rice seedling to rot. The control measures of rotten early rice seedlings are as follows:

Raising seedlings of early rice

Permeable ventilation. The seedling field should not only be permeable to facilitate the germination of early rice seeds, but also aerate to facilitate the rooting and growth of early rice seedlings. Specific methods: first fine the soil in the rice field, ditch to make the border, apply sufficient fertilizer, break the mud block on the border surface, initially rake flat; then soak in water, and then further level the border surface in the rice field.

Plan to raise seedlings. Grasp the suitable sowing date of early rice and determine the suitable seedling age to avoid rotten seedlings. The normal emergence temperature of early rice is 15 ℃, so when raising early rice seedlings in open field, it is necessary to wait until the temperature rises steadily to 12 ℃. If the seedling is raised early, the temperature is low, the rice seedling grows slowly, the seedling age should be longer appropriately; if the seedling is raised late, the temperature is higher, the rice seedling grows fast, and the seedling age should be shorter.

Sparse broadcast and even broadcast. The sowing rate in the seedling field should be determined according to the seedling age and the temperature in the seedling raising season. In principle, seedlings are required to be sparsely sown and evenly sown, so that each early rice seedling can get enough sunlight, air and nutrients to thrive. If the sowing is too dense, it will reduce the amount of light in the later stage of the seedling, affect the assimilation, reduce the rooting ability, the seedling body is not strong, easy to rot the seedling. In general, seedlings within 20 days of seedling age in spring paddy fields are planted at 180,200 kg per mu, while large seedlings with a seedling age of about 30 days are planted at 80kg / mu.

Cultivate strong seedlings. The cultivation of strong seedlings is the basis for high yield and prevention of rotten seedlings of early rice. The moist method of raising seedlings can be used to cultivate strong seedlings of suitable age. In the seedling stage, it is generally only irrigated in the ditch of the seedling field to keep the surface of the field moist and ventilated, but not on the surface of the field, so as to promote the early rice seeds to take root and set up seedlings quickly. In the rooting period, it is necessary to flexibly grasp the water layer and prevent freezing and sunscreen. Keep the seedling field with both water and ventilation, in order to take root and protect seedlings.