How to prolong the rice seedling age and prepare for drought resistance and rain planting?
In normal years, the seedling age of machine transplanting is about 30 days, that of throwing seedlings is about 40 days, and that of water raising seedlings is about 50 days. If the planting water comes late, it will be faced with extending the seedling age to more than 60 days in order to wait for the seedlings to be planted in water.
First, sparse sowing to cultivate long-aged and strong seedlings. That is, by expanding the area of seedling bed, reducing the sowing amount per square meter and prolonging the lag tillering period of seedlings, the elasticity of seedling age of early sowing seedlings can be effectively increased, the seedling quality can be improved, and the per unit yield can be improved. it can also solve the contradiction of anhydrous transplanting in the early stage. The thinner the sowing is, the more elastic the seedling age is. If other management cooperates well, the seedling age of dry-raised seedlings can exceed 70 days.
The second is chemical regulation to prolong the seedling age. On the basis of dry cultivation and sparse sowing, paclobutrazol was sprayed 1 to 2 times after 3 leaves, and 50 kg of 15% paclobutrazol wettable powder was evenly sprayed with 50 kg of water per mu (in principle, according to the concentration of 150PPM) to promote tiller and control growth. Under the same circumstances, the seedling age can be extended by more than 10 days.
The third is to plant seedlings in two stages. For the nursery bed with normal sowing time and large sowing rate, if we want to wait for water-planted seedlings and the seedling age is more than 60 days, we should prolong the seedling age by two-stage posting. When the seedling grows to 2 leaves and 1 heart, the seedlings are planted according to row spacing 6-10cm and nest spacing 5-8cm. 15% paclobutrazol was sprayed on each mu of rice seedlings 2 to 3 days after posting, and if the seedling age was more than 70 days, the same method was applied again after 15 days to cultivate long-aged and multi-tiller strong seedlings.
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How to cultivate strong rice seedlings with paclobutrazol and uniconazole
Paclobutrazol and uniconazole are both plant growth regulators, which have good effects on controlling growth and promoting tiller, preventing rigidity, preventing abortive seedlings and increasing panicle, grain and yield in rice seedling raising. The method of using paclobutrazol is to spray 100kg paclobutrazol with 300ppm concentration per mu of seedling field when one leaf is of one heart, so as not to miss spray or re-spray. When spraying, it is necessary to release the moisture of the seedling field and keep the field free of stagnant water. The usage of uniconazole is as follows: soaking seeds with 50-200ppm concentration of uniconazole solution for 48 hours, seeds and chemicals.
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How to use special compound fertilizer for rice
Special compound fertilizer for rice is a kind of medium concentration compound fertilizer developed according to the demand of nitrogen, phosphorus and potassium after transplanting, which is most suitable for transplanting rice field. It has the characteristics of "low cost", "easy to use", "quick return to green" and "good safety". After use, it can enhance the ability of crops to resist lodging and diseases and insect pests, and the effect of increasing production and income is obvious. Usage: as rice base fertilizer, the dosage is generally 25kg / mu, there is no need to apply other chemical fertilizers, you can transplant rice seedlings immediately after fertilization.
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