Grasp the best topdressing period of crops
corn
After the jointing to the trumpet period, the corn is the peak period of nutrient absorption. Generally, the first fertilizer can be applied before and after jointing. 150 kg of ammonium nitrate or 120 kg of urea can be applied per hectare; 7 to 10 days before the tasseling, The second fertilizer should be applied, and 225 kg of ammonium nitrate or 180 kg of urea can be recovered per hectare. If the base fertilizer and seed fertilizer are sufficient and the soil is very fertile, one can concentrate the top dressing and combine the second shovel for deep fertilization.
Sorghum
In order to meet the nutrient requirements of sorghum from jointing to heading, the first fertilizer should be applied at the jointing stage, and 150 to 225 kg of ammonium nitrate or 120 to 180 kg of urea should be applied per hectare; Fertilizer, 120 kg of ammonium nitrate per hectare or 75 kg of urea.
Rice
The absorption of nitrogen fertilizer by rice began to increase gradually after returning to green, and reached the peak of fertilizer absorption at the peak of tillering. In order to promote early tillering of rice, early application and heavy application of manure should be applied. Generally, 225 kg of ammonium sulfate can be applied per hectare 7 to 10 days after transplanting, and 100 kg of urea should be applied at the time of heading.
wheat
Wheat should be topdressed at the three-leaf stage, usually 195 to 270 kg of ammonium nitrate or 135 to 180 kg of urea per hectare. In the later stage of wheat, due to the weakening of nutrient uptake by roots from the soil, a top dressing should be carried out at the heading and flowering stage. 2,250 g of potassium dihydrogen phosphate per hectare, 22.5 ml of triacontanol solution and 300 kg of water are mixed. Spray; it is also possible to use 3000 g of potassium dihydrogen phosphate per hectare, add 15 kg of urea, and spray 450 kg of water.
Soy
Soybeans are crops that require more nitrogen fertilizer. Usually, nitrogen fertilizer is applied in the early flowering stage of soybeans, which can reduce the rate of flowering and falling, and can prolong the life of plants, increase grain weight and increase yield. Generally, 150 to 225 kg of ammonium nitrate or 120 to 180 kg of urea can be applied per hectare; in the period of soybean pod formation, a top dressing can be carried out, and the effect of increasing yield is more obvious.
Drum brush is divided into long hair, medium hair, short hair three kinds, its performance is the length of the drum brush hair, rather than the thickness and length of the drum itself, brush hair is usually divided into wool and chemical fiber two kinds.
Different rollers will brush different effects, long hair rollers will brush out some fine texture, concave and convex feeling, similar to the texture effect. The paint surface after short wool roller besmear is more uniform, smooth, without concave and convex feeling, in the wool is between the two.
Roller brush is mostly made of wool and foam plastic, which can be divided into paint drum brush, hair drawing drum brush, floor paint drum brush, flat coating drum brush, etc., mainly used for large-area paint rolling in architectural decoration engineering. And can be used for coating and rolling all kinds of paint, such as: latex paint, anti-rust paint, internal and external wall paint, wallpaper glue, etc.
Note:
The use of drum brush as long as the straight brush can be wiped, if you want to daub evenly, the drum is best in the paint bucket to be fully absorbed, and then take out a few rolling on the inclined plane, press out the excess paint and then begin to brush the wall.
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