Cruciferous crops pay attention to the application of boron fertilizer in winter crops, cruciferous crops account for a large proportion, such as cabbage, cabbage, radish, rapeseed, etc., these crops are particularly sensitive to boron. At the same time, celery, wheat, carrots, etc. are also sensitive to boron. Boron deficiency is not only severely affected by reproductive growth, but also vegetative growth hits the wall, the ability to resist cold is reduced, and heart rot is easily induced.
Application method: 1 The basic fertilizer boron fertilizer has the best effect on the soil with moderate or severe boron deficiency; 0.5-0.75 kg of borax per mu can be mixed with dry fine soil or organic fertilizer, then ditch strip application or hole application; Or mix with nitrogen, phosphorus, potassium and other fertilizers; do not directly contact the seeds (live) or seedlings (transplanting), so as not to affect the growth of germination, emergence and roots, seedlings; The amount of application should not be too large; if the amount of borax applied per mu is more than 2.5 kg, the emergence rate will drop, and even the dead seedlings will be reduced. 2 to solve the seed soaking should use borax or boric acid, usually first dissolve the borax with hot water of 40 ° C; add cold water to 0.01% - 0.03% of borax or boric acid solution; pour the seeds into the solution, soak for 6-8 hours The seed and liquid ratio is 1:1, and it can be sown after being taken out and dried. 3 external top dressing (foliar spray) with 0.1% -0.25% borax or boric acid solution, spray 40-80 kg solution per acre; 6-7 days once, even spray 2-3 times; leaf surface Spraying in the afternoon is good, spray to the surface of the leaves with fog drops; if it rains within 6 hours after spraying, it should be sprayed once.
Before low temperature, pay attention to the application of wax fertilizer to apply the wax fertilizer, which can increase the ground temperature by 2 °C - 3 °C, and increase the potassium content of the crop cells, thereby increasing the water holding capacity of the cells, making the cells less susceptible to freezing at low temperatures and strengthening the cold resistance; Fertilizer must vary from crop to crop. The rapeseed should be mixed with the fertilizer and the phosphate fertilizer. The per capita a field is applied to the rapeseed line with about 1500 kg, and the soil is combined with the soil, and it is applied from late December to early January. The early-maturing rapeseed variety is spring, early. It should be applied earlier than late-maturing rapeseed varieties; wheat should be applied in the middle and late December, and strong seedlings should be mixed with soil, while weak and late-maturing wheat should be mixed with appropriate amount of phosphate fertilizer. Each acre of field application or application of soil fertilization 2500 kg or so; perennial crops application of fertilization should account for 50% of the annual fertilization amount, 5000 kg per mu of soil and 2,500 kg of pig and cow manure, and It is better to apply before the snow after the frost.
The greenhouse vegetable and raisin is resistant to the large amount of nitrate accumulated in the nitrate itself, but it is easy to be converted into nitrite. The nitrite is easy to replace the iron in the human blood and cause blood poisoning. Nitrite and amines can form a strong carcinogen, nitrosamine, which causes cancers such as stomach and intestines. In winter, there are more meteorological conditions of low temperature and low light, and greenhouse vegetables are more likely to cause a large accumulation of nitrates, especially leafy vegetables and root vegetables. The amount of nitrogen fertilizer should be strictly controlled, and phosphorus and potassium fertilizer should be added. In particular, nitrate nitrogen fertilizers such as ammonium nitrate and potassium nitrate cannot be applied.
The structure of the core barrel is generally divided into single - acting double core tube and most of the fishing apparatus. The double tube section consists of an outer tube assembly and an inner tube assembly. The outer pipe assembly includes; The main structure and working principle of the cartridge stopper, cartridge chamber, stable joint outer pipe, diamond reamer and diamond bit are as follows:
(1) Spear structure is composed of spear head and recovery spring. When coring, the fishing device is lowered to the upper part of the inner tube assembly in the drill pipe, and the fishing hook grasps the fishing spear, lifts the fishing device up, picks up the recycling card barrel, and inwardly compressing the cartridge card, so that the inner tube assembly and the outer tube are separated, so that the inner tube assembly is lifted up.
(2) The clip structure is mainly composed of the clip frame, clip, spring and other components. Its function is that when the inner tube sits on the outer tube, the clip expands with the help of the elastic force of the expansion spring and sticks to the inner wall of the clip chamber, so that the drilling tool can achieve positioning.
(3) Buffer structure by spring, locking mother, split pin composition. Protecting the inner tube when pulling the core.
(4) Single action structure is realized by two pairs of thrust bearings.
(5) Adjust the length of the inner pipe assembly and the outer pipe assembly of the structure, and fine-tune the lower shaft and the locking mother to achieve the gap required by the end of the spring seat and the step inside the drill bit.
(6) The fishing structure, also known as the fishing device, is mainly composed of fishing hook, hammer and safety rope. The fishing hook is used to hold the spearhead while fishing the inner pipe, and the weight is used to speed up the fishing device's descent to save fishing time. The safety rope is a thin rope. When the inner pipe is stuck for some reason and cannot be lifted, the safety rope can be forcefully lifted and then the drill can be lifted.
Other Parts,Spearhead Base,Compression Spin,Core Lifter
WUXI XINZUAN GEOLOGICAL EQUIPMENT CO.,LTD. , https://www.wxsmrxz.com