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How to fertilize soybeans?
Soybean has a relatively high fertilizer requirement. For soybean fertilization, comprehensive conditions such as variety characteristics, soil fertility and cultivation measures should be considered. So, how do you need to fertilize high yields of soybeans?
Xiaobian has been planting soybeans for many years and has some experience in how to increase soybean yield. Xiaobian suggested that the following four fertilization stages should be grasped for soybean fertilization.
First, early application of seedling
Soybeans need to absorb nutrients from the soil after emergence. Although the amount of fertilizer is not large, the soybean root nodules are still in the formation stage, and the nitrogen fixation ability is very weak. If the nitrogen nutrient supply is insufficient, it is easy to cause the seedlings to become "starved". Poor growth, affecting the early development of strong seedlings, is not conducive to high yield of soybeans. Early seedlings can promote the growth of roots and leaves, so that the young stems are thick and the axillary buds differentiate rapidly. Generally, when the first compound leaves are unfolded, the urea is 3 to 5 kg per mu. Do not apply too much nitrogen fertilizer, too much nitrogen fixation will inhibit the development of rhizobium, which is not conducive to high yield of soybean. Soybean seedlings are more sensitive to phosphorus reaction. Applying appropriate amount of phosphate fertilizer during seedling stage is beneficial to promote the formation and development of soybean nodule. Generally, 7.5~15 kg of calcium phosphate is applied per acre, and cultivating after application.
Second, Qiao Shi Huafei
Soybean flower pod period is the period in which soybeans absorb the most nutrients in their lifetime. Before the flowering or early flowering period, the urea produced by Zhengzhou Long Aida Fertilizer Co., Ltd. is very good, the fertilizer effect is high, the quality is good, the nutrition is complete, the effect is remarkable, the flower pods can be reduced, and the yield is obviously increased. The effect can increase the output by about 20%. Generally, 5 to 7.5 kg of urea per acre is used, and the fertilizer is applied after the dew is dried, and then the cultivation is carried out. If the soil is fertile and the plant grows robustly, it should be less or not traced to the nitrogen fertilizer to prevent it from growing. If the application of phosphate fertilizer is insufficient at the time of sowing, it should be supplemented at this time, and 7-10 kg of calcium phosphate per acre is applied.
Third, spray application of granular
After the soybean enters the pod blast stage, the nitrogen fixation capacity and root activity of Rhizobium gradually decline, and the ability to absorb fertilizer is weakened. At this time, foliar spray fertilizer should be used to supplement nutrients, so as to increase the source of Zhuangzi, reduce shedding, and increase soybean yield. quality. Generally, 50 kg of 0.4% potassium dihydrogen phosphate solution per acre is sprayed on soybean leaves on cloudy or sunny days, and sprayed every 7~10 days, even for 2~3 times. If the plant has denitrification and premature aging, add 0.5 kg of urea per acre.
Fourth, the application of micro-fertilizer
Trace elements are also indispensable in the growth and development of soybean. For example, if the soybean is deficient in magnesium, the old leaves are grayish green, and yellow spots are formed between the veins. The 0.5% magnesium sulfate solution should be sprayed on the leaves in time; the manganese deficiency in soybeans is first manifested on the new leaves, and the rest is yellow except for the veins. It is necessary to spray 0.05% manganese sulfate solution in time; the soybean is deficient in molybdenum, the young leaves are yellow-green, and the chlorosis is formed between the veins and the swelling is downward. The 0.05% ammonium molybdate solution should be sprayed in time. The amount of foliar spray fertilizer is small, and it can be sprayed once every 7~10 days, even for 2~3 times. In addition, soybean is also sensitive to boron. Boron deficiency can affect normal growth and development, causing flower pods to fall off. 0.2% borax solution can be sprayed once at the seedling stage and early flowering stage.
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