For the winter wheat with a yield of 400-500 kg per mu in the Huang-Huai-Hai Plain, it is recommended to combine 1500-3000 kg of fertilized farmyard manure with 15 mm, 10-20-10, such as medium-nitrogen high-phosphorus and low-potassium compound fertilizer or 15-15-15. Compound fertilizer 25 ~ 35 kg, or the amount of nutrients and the ratio of urea, phosphate diammonium, potassium chloride and other fertilizers. If the straw is returned to the field, the amount of potassium fertilizer can be appropriately reduced, but 3 to 5 kg of urea should be added per acre. The top dressing is mainly from the beginning to the jointing stage. According to the local soil and seedlings, 15-20 kg of urea is applied once or several times. For the wheat in the arid regions of northwest China, the fertilization should be combined with the drought-resistant and water-saving techniques, and the seedlings should be plucked; the rice in the Yangtze River basin should be combined with the drainage and anti-caries technology of the Qinggou Sangou (boxing, gutter, and fur). Phosphate fertilizer should use calcium superphosphate or calcium magnesium phosphate fertilizer, and increase the proportion of potassium fertilizer.
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Electric Hand Drill
Electric hand drill is a drilling Tool powered by AC power or DC battery. It is a kind of hand-held electric tools.
Hand electric drill is the largest sales of power tools industry products, widely used in construction, decoration, furniture and other industries, used in the object on the opening or piercing objects, some industries are also known as electric hammer.
The main components of the hand electric drill: drill chuck, output shaft, gear, rotor, stator, housing, switch and cable.
Electric hand drill (pistol drill) - used for drilling metal materials, wood, plastic, etc. When equipped with a positive and negative switch and electronic speed regulating device, it can be used as an electric screwdriver. Some models are equipped with rechargeable batteries, which can work normally without external power supply for a certain period of time.
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