Our Heterocyclic Compounds has been developing from 2015 year, it is a relatively new class of compounds in our company. Our heterocyclic compounds conducted by a dedicated research and development teams. The R & D team focused on researching heterocyclic compounds, other products are performed by other technical team. Our goal is to catch up with the industry's professional heterocyclic manufacturer. At present our products are mainly composed of pyridine, pyrimidine, thiazole. In addition to our regular products, we accept any form of customized services, to undertake from grams to tons of production. After receiving inquiry, we will give a quotation within 2 working days with coa specifications,If you have special requirements, please provide details in the mail, we will combine the specific requirements and provide an accurate accounting of the costs of the offer. Under normal circumstances, we have the longest production cycle is not more than 45 days. Heterocyclic Compounds Heterocyclic Compounds,Cyclopropanecarboxylic Acid,Benzenedithiol Dihydrochloride Taizhou Volsen Chemical Co., Ltd. , http://www.volsenchem.com
Second, use good species. Collect mature chestnut seeds in the autumn, pick out the species of fleas, insects, and air-dried species. The chestnut species should not be too large or too small. The chestnut species should be used in large quantities and the seedling cost is high. The seeds are too small and contain less nutrients. Poor seed quality, small seedlings, weak seedlings, and poor development. Generally about 200 capsules per kilogram is appropriate. After the seeds are collected, they should be treated with sand. The trenches should be ditched and stored in a place with high dryness, good drainage, and cool leeward place. The ditch depth should be about 100 cm and the width should be 50-80 cm. The length depends on the number of seeds. Mix the seed with wet sand in a ratio of 1:5 and put it into a ditch or a layer of wet sand. Moisture content in wet sand should be controlled by a handful of loose and loose water. Stacked wet sand slightly higher than the ground, put on earth to prevent accumulation of water.
Third, cut off the radicle. In the middle and late March of March, seedlings will be sown when one third of the sand chestnuts sprout, and the radicles will be cut off before sowing. The method is to remove sand germinated chestnuts from sand pits and force them with a sieve to make them collide with each other to knock off the buds (radical roots). Unsprouted chestnuts continue to grow in sand, and they are sown with broken roots. This results in the development of chestnut seedlings from one main root of the continuous radicle to three to five lateral roots after the sclerotial root.
Fourth, the size of ridge nursery. In view of the poor ventilation and light transmission in the equal row spacing seedlings, it is easy to form “donkey trough seedlingsâ€, the yield of qualified seedlings is low, and inconvenient management and other issues need to be adopted. First spread 4000 kg of crude fertilizer on the ground of the nursery. When the bottom is insufficient, spray the water first, then deepen the leveling. Use a plough or pry open the ditch with a depth of about 15 cm. Evenly spread the compound fertilizer and a certain amount in the groove. The pesticide poisonous soil, fertilizer application amount 25 to 30 kg per mu. Separate the seed with a light cover soil, and then place the chestnut seedlings 8 to 10 cm away from the planter. Put the chestnuts down evenly on the sides of the plant. Put the seeds on the side and put the seed on the soil. In the second row, a double row is sown at intervals of 50-60 centimeters, and so on, forming a ridge with a large row spacing of 50-60 centimeters and a small row spacing of 20 centimeters and 20 centimeters.
Fifth, cover film. After sowing, cover with a width of 90 cm, a thickness of 0.005 mm film on the seeding of the two small row ridges, both sides buried soil compaction, with the seeding with the cover film, in order to facilitate protection. Found that there is a seedling emergence, timely removal of plastic film to prevent sunburn.
Six, take heart from time to time. After the seedlings are unearthed, they must be checked and the sprouting and delivery should be promptly removed. When the seedling height is 60 to 70 centimeters, it should be picked up at any time. The second and third shoots that grow after picking the heart should be promptly chopped off.
7. Strengthen field management. First, weeds the grass in time to create good environmental conditions for the normal growth and development of the seedlings; second is to prevent the pests, building bridge insects, aphids, moths, powdery mildew and other pests and diseases; the third is to recover in late June and late July respectively. Apply urea twice, 15 to 25 kg each time.
Techniques for cultivating seedlings of chestnut broken embryo root cover
First, choose a good place. Choose the flat land, convenient water source, good ventilation, deep soil, fertile soil, slightly acidic or neutral sandy loam soil as nursery, and saline and alkali land and clay land should not be used as nurseries for chestnuts.