The test site is located in Binhu Township, Changji City. The tested cotton variety, Battery No. 1, has an effective accumulated temperature of 3374e, an average annual precipitation of 190mm, a maximum precipitation of 280mm, a minimum precipitation of 150mm, an average annual evaporation of 1756mm, and a frost-free period of 160d. The test soil was irrigation and siltation soil, located at the south edge of the alluvial fan, with an elevation of 800m, a ground slope of 0104b, and an area of ​​13313hmz (2000 acres). The physical and chemical properties of the soil were: soil thickness 20an, bulk density 1144g/}n'3, organic matter 1126%, total nitrogen 01054%, alkaline hydrolysis nitrogen 6318mg/kg, available phosphorus 516mg/kg, available potassium 152mg/kg, pII815; soil thickness When 30an, the bulk density is 41g/anz, and when the soil thickness is 50an, the bulk density is 1138g/an'3.
Using a soil moisture monitor to measure 0}20}n, 20}50an, 50}100an soils, under normal conditions, measured at 15d1, rainfall above 5mm, measured before and after irrigation, measured at growth period, observation of growth period Record. Pressurized drip irrigation is more efficient than conventional in the utilization of water, and the economic benefits are good. This is due to: (1> pressure drip under the membrane, uniform irrigation, uniform growth of the whole crop, which lays the foundation for increasing yield; (2) submerged membrane drip irrigation replaces the traditional gully irrigation method, and sowing rate and number of mu. Increased utilization of land has improved the foundation for increasing yield; (3) The supply of water and fertilizer under drip irrigation through the drip irrigation system to crops, inhibits the growth of weeds between the membranes, and the weeds under the membrane are exposed to high temperatures. And lack of support can not grow, create better conditions of water and fertilizer for the crops, promote the growth of the crops, increase production; (4) The membrane under pressure drip irrigation can overcome due to poor land formation and difficult irrigation, and uneven irrigation Disadvantages.Additional membrane drip irrigation also creates good conditions for field management of crops such as cultivators, fertilization, and pesticide application, making it easier to implement mechanization operations, which liberates people from heavy manual labor.
After monitoring and comparing the soil moisture of two plots by the soil moisture monitor, it can be found that compared with the conventional drip irrigation, the pressure drip irrigation under the membrane has a significant increase in the utilization rate of water. Both the economic benefits and the net income benefits are A very clear improvement. Therefore, it is very important that the measures for drip irrigation under agricultural irrigation in the water-saving agriculture. Due to differences in soil, climate, varieties of tested crops, and field management levels, test data and conclusions need to be further improved.
Stamping is an efficient production method. Using compound molds, especially multi-position progressive molds, it is possible to complete multiple stamping processes on one press (single station or multi-station) to achieve unwinding and straightening with strips. Flat, blanking, automatic production of forming and finishing. With high production efficiency, good working conditions and low production costs, it can produce hundreds of pieces per minute. Compared with other methods of mechanical processing and plastic processing, stamping has many unique advantages both technically and economically. The main performance is as follows.
(1) The stamping process has high production efficiency, convenient operation and easy realization of mechanization and automation. This is because stamping is accomplished by means of die and punching equipment. The number of strokes of ordinary presses can reach several tens of times per minute, and high-speed pressure can reach hundreds or even thousands of times per minute, and each press stroke is You may get a punch.
(2) Since the die guarantees the size and shape accuracy of the stamping part during stamping, and generally does not destroy the surface quality of the stamping part, the life of the die is generally longer, so the stamping quality is stable, the interchangeability is good, and it has [the same" Characteristics.
(3) Stamping can process parts with a wide range of sizes and shapes, such as stopwatches as small as clocks, as large as automobile longitudinal beams, coverings, etc., plus the cold deformation hardening effect of materials during stamping, the strength of stamping and The stiffness is high.
(4) Stamping generally does not generate scraps, material consumption is small, and no other heating equipment is required. Therefore, it is a saving material and energy-saving processing method. The cost of stamping parts is low.
Because stamping has such superiority, stamping processing has a wide range of applications in various fields of the national economy. For example, there are stamping and processing in aerospace, aviation, military, machinery, agricultural machinery, electronics, information, railways, post and telecommunications, transportation, chemicals, Medical Equipment, household appliances and light industry. Not only is it used by the entire industry, but everyone has direct contact with stamping products. There are many large, medium and small stampings on airplanes, trains, cars and tractors. The car body, frame and rim are all stamped out. According to relevant survey statistics, 80% of bicycles, sewing machines and watches are stamping parts; 90% of televisions, tape recorders and cameras are stamping parts; there are food metal shells, steel refining boilers, enamel bowls and Stainless Steel cutlery. All are stamping products using molds; even the hardware of the computer lacks stamping parts.
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