Autumn tricks
2. Autumn basal fertilization should be 2 to 3 months ahead of winter basal fertilization. It should be carried out immediately after picking the fruit and arable land. 3, the selection of manure must be fully cooked, it is strictly prohibited to use dry manure or fresh manure. At the same time with the right amount of nitrogen, phosphorus, potassium fertilizer, or use of apple fertilizer. 4. The fertilizer must be mixed with the soil in the ditch and applied to the root distribution layer (20-60 cm) to avoid burning the roots. 5, fertilization method can be used trench method can also be used disk method. When the ditch is applied, a circular, rectangular, and arc-shaped fertilization ditch is excavated at the position of the canopy dripping line. The ditch depth is 40-50 cm. The width of the ditch should be determined by the amount of fertilizer and the ditch should be flat. Spread the dry fertilizer in the ditch after watering, and cover the soil immediately after the water is dry. Before the fertilization, the roots of the exposed trench should be cut along the trench walls. The cut should be smooth to prevent the roots from becoming moldy and rot. When fertilizing, the fertilizer should be applied layer by layer. The coarse fat such as leaves and weeds should be placed on the bottom and the top layer should be placed. For organic fertilizers, apply a layer of fertilizer to each layer of the soil. The weight of the soil should be 25-30 cm above the ground. The root groups of adult trees are staggered in the orchard and can be cast by the method of spreading the topsoil on the side of the plant along the spacing or spacing of the plants. When the soil is near the trunk, it should be shallow (7–10 cm) away from the trunk. Should be deep (40-60 centimeters), then spread dry fertilizer, then cover the soil. 6, where conditions permit, combined with orchard grass, vigorously develop grass - animal - marsh supporting technology, as far as possible to promote balanced fertilization or formula fertilization technology. Carbon steel seamless steel pipe is a kind of long steel with hollow
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1. Base fertilizers applied in the fall mainly include organic fertilizers such as manure, compost, and straw, supplemented by chemical fertilizers, so that the combination of soil and supply can be improved, and the delayed effect and quick-effect complement each other. When applying chemical fertilizers, pay attention to the ratio of nitrogen, phosphorus, and potassium, and do not apply excessive available nitrogen fertilizer, otherwise it is easy to cause winter shoots. At the same time, it is necessary to apply trace elements in a targeted manner.
Compared with solid steel such as round steel, steel pipe has the same
bending and torsional strength and is lighter in weight. It is a kind of
economic cross-section steel, widely used in the manufacture of
structural parts and mechanical parts, such as oil drill pipe,
automobile transmission shaft, bicycle frame and steel scaffolding used
in construction.
The manufacture of ring parts with steel pipes
can improve the utilization rate of materials, simplify the
manufacturing process, save materials and processing time, such as
rolling bearing rings, jack sleeves, etc., which have been widely used
to manufacture steel pipes.
Steel pipe is an indispensable
material for all kinds of conventional weapons, and the barrel and
barrel are made of steel pipe. Steel pipes can be divided into round
pipes and special-shaped pipes according to the different shapes of the
cross-sectional area. Because the circular surface volume is the largest
under the condition of equal circumference, more fluid can be
transported with circular tubes. In addition, when the annular section
is subjected to internal or external radial pressure, the force is more
uniform, so the vast majority of steel pipes are round pipes.
The use of steel pipe to manufacture ring parts can improve the
utilization rate of materials, simplify the manufacturing process, save
materials and processing hours, such as rolling bearing rings, jack
sleeves, etc., currently has been widely used to manufacture steel pipes