1. Pick up seedlings at the seedling stage. From cotyledon development to true leaf dew to 8-10 leaves, about 15-20 days for seedling stage. At this time, the growth rate is faster, which is the fastest period of differentiation of roots and leaf cells and tissues. Although there is not much fertilizer required, the lack of time has a great influence on the yield. Therefore, after the seedlings are planted, 10 kg of ammonium nitrate should be applied.
2. Focus on topdressing during the rosette period. After the Chinese cabbage enters the rosette stage, the roots occur in large quantities, the growth is prone to increase, the amount of fertilizer is large, and the leaves that produce nutrients during the ball-forming period grow substantially in this period. Therefore, the vigorous growth of the rosette stage plays a decisive role in the growth of the leaf ball. . This period is a crucial period for the future. The rosette period is generally 20-25 days, 15 kg of ammonium nitrate is applied in acre, and a certain amount of phosphorus and potassium fertilizer is applied to promote the growth of the outer leaves, so as to lay a good foundation for keeping the heart.
3, the core period of topdressing. The core period accounts for 1/2 of the growth period, and the growth rate accounts for 2/3, which is the key period for the formation of Chinese cabbage. If the fertilizer is removed at this time, it will directly affect the tightness of the package and affect the yield and quality. The outer leaves close to the heart leaf in the early stage of the circumstance continue to grow, and it is also the fastest period of 1-5 heart leaf growth. At this time, 15 kg of ammonium nitrate is applied per mu; the outer leaves of the middle part of the core are almost no longer growing, and the quick-acting fertilizer is chased. 10 kg of ammonium nitrate; late in the core, due to short light, low temperature, slow plant growth, less nutrient absorption, less obvious effect of topdressing, can be less chasing or not topdressing.
Huaxian Liu Huimin
Product Features
1. The product is easy to open and close, which can effectively seal deep well plates, sample tubes, etc., which is convenient for operation and saves time.
2. Good airtightness can prevent the volatilization of various solvents.
3. Tolerate a wide temperature range, suitable for various experiments.
4. Resistant to chemical corrosion and used for low-temperature storage.
5. The pre-opened silica gel lid allows the Pipette tip or probe to enter the hole without damaging the lid.
6. After the third party inspection, no RNA/DNA enzyme contamination
7. It can be used on automated machines, and the product size conforms to the SBS standard
8. It can be used with stickers, silica gel, and sealed without leakage. 96 round-hole silica gel and 8-hole silica gel strip with matching sealing plate
9. Good flatness, can be transported long distance after sealing with heat sealing film
10. The products are produced and packaged in a 100,000-class dust-free workshop, and the product quality is stable
11. Alphabetical sorting and cut corner marking make the storage and collection of samples more convenient and faster.
12. Each package has an independent article number and batch number identification, which is convenient for quality tracking and traceability
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Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yongyuepcr.com