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Humidity recorder humidity soil 18 ~ 20cm during the measurement of humidity changes shown in Figure 3, the soil moisture range of 3% to 21%. Compared with CK, soil humidity under the wood chip treatment was the highest, wheat straw was the second, and lawn coverage was similar to CK. In the event of rainfall, the soil moisture content increased significantly; the increase was marked by wood chip coverage and wheat straw coverage, followed by turfgrass coverage, and the change in soil moisture content of crushed stone was similar to that of CK. The results of temperature and humidity recorder test show that wood chips cover and wheat straw cover can effectively improve soil water storage and water retention capacity and increase soil moisture, among which wood chip coverage treatment has the best effect.
The wheat stalk covered 21.0°C, and the turf covered 20.4°C. During this period, the surface temperature changed greatly, while the soil temperature range under the covering treatment decreased. Among them, straw mulch treatment was the lowest fluctuation of soil temperature, followed by woodchip coverage. The temperature variation of the 18-20cm soil layer in the tree-disc soil is 13°C-29°C. The average of temperature is: gravel cover (23.3°C)> wood chip coverage (21.7°C)> CK is (21.5°C)> wheat straw cover (21°C) > Turf cover (20.6°C), 4°C to 5°C lower than 0～10cm soil temperature.
Soil temperature fluctuations under gravel cover treatment are large. The soil temperature under other treatments is less than that of the control. Wheat straw cover, lawn cover, and wood chip cover all have a function of reducing soil temperature, which can prevent high temperature damage to the root system. Among them, straw cover cooling best effect. Temperature and humidity recorders found that during the rapid growth period of trees (from mid-June to the end of July), soil temperature range of 0 to 5cm varies from 18°C ​​to 33°C, and the average temperature of different coverage treatments is ranked as follows: Gravel cover (26.8 °C)> CK (26.4 °C)> Wood chip coverage (23.3 °C)> Grass cover (22.6 °C)> Wheat straw coverage (22 °C).
Through the use of temperature and humidity recorders in the experiment, it was found that the humidity changes of 18-20 cm soil layers in different covering treatments and different growing stages were different, ranging from 3% to 22%. Among them, the average soil moisture content covered by gravel was smaller than that of the control, and the average humidity under the lawn coverage was slightly lower than that of the control, which may be related to water consumption of turfgrass growth; and soil humidity covered by sawdust and straw was significantly higher than that of the control. Plays a significant moisturizing effect.
The wheat stalk covered 21.0°C, and the turf covered 20.4°C. During this period, the surface temperature changed greatly, while the soil temperature range under the covering treatment decreased. Among them, straw mulch treatment was the lowest fluctuation of soil temperature, followed by woodchip coverage. The temperature variation of the 18-20cm soil layer in the tree-disc soil is 13°C-29°C. The average of temperature is: gravel cover (23.3°C)> wood chip coverage (21.7°C)> CK is (21.5°C)> wheat straw cover (21°C) > Turf cover (20.6°C), 4°C to 5°C lower than 0～10cm soil temperature.
Soil temperature fluctuations under gravel cover treatment are large. The soil temperature under other treatments is less than that of the control. Wheat straw cover, lawn cover, and wood chip cover all have a function of reducing soil temperature, which can prevent high temperature damage to the root system. Among them, straw cover cooling best effect. Temperature and humidity recorders found that during the rapid growth period of trees (from mid-June to the end of July), soil temperature range of 0 to 5cm varies from 18°C ​​to 33°C, and the average temperature of different coverage treatments is ranked as follows: Gravel cover (26.8 °C)> CK (26.4 °C)> Wood chip coverage (23.3 °C)> Grass cover (22.6 °C)> Wheat straw coverage (22 °C).
Through the use of temperature and humidity recorders in the experiment, it was found that the humidity changes of 18-20 cm soil layers in different covering treatments and different growing stages were different, ranging from 3% to 22%. Among them, the average soil moisture content covered by gravel was smaller than that of the control, and the average humidity under the lawn coverage was slightly lower than that of the control, which may be related to water consumption of turfgrass growth; and soil humidity covered by sawdust and straw was significantly higher than that of the control. Plays a significant moisturizing effect.
Investment Casting also can be called "precise casting" or [lost wax casting" or "dewaxing casting". The casting materials can widely use and no limitation for product shape as well as complex structure. The most important characteristic is the close tolerances control, reduced machining allowances, and fine surface finish.
Its application scope can be wider after using the new equipment and advanced technology. In heat processing industry, investment casting can be used for those products which difficult to choice the materials, or materials not easy to form a shape, as
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satisfied reply.
We undertake the processing cooperation for drawings and samples at home, even all over the world, if you need to inquire about price, please submit the related information, we will offer you a most favorable price as soon as possible.
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