After studying the relationship between land use and soil quality, it was found that changes in different land use patterns inevitably lead to changes in soil properties and changes in land productivity. Scientific and rational land use management measures can improve soil structure and improve soil organic matter. Content, regulate biological activity, promote nutrient flow, increase soil resistance to changes in the external environment, maintain and improve soil quality; unreasonable land use methods will lead to decreased soil quality, accelerated soil erosion, resulting in soil degradation.
Soil salinized meadow soil is widely developed in the area with higher groundwater level in the middle reaches of the Heihe River. The content of fine-grained matter in the soil is higher, the soil structure is better, the organic matter content is higher, and the fertility is relatively good, but the salinization is very serious. Suitable for agricultural farming, only suitable for grazing. In the past 30 years, with the expansion of human activities, the contradiction between population, resources, and the environment has become increasingly acute, and some of the meadow saline soils that are not suitable for cultivation have gradually been used.
The use of soil nutrient fastness tester has a higher content of organic matter, total nitrogen and total phosphorus in meadow saline soil than in aeolian sandy soil in the study area. Due to reasonable farming and management measures, soil nutrient content increases with the increase of the history of planting. Soil organic matter is not only the source of plant mineral nutrition and organic nutrition, but also an important factor in the formation of soil structure. The content of soil organic matter determines the main factors of soil nutrient storage and supply levels. Therefore, soil organic matter directly affects soil fertility, water retention, buffering capacity, ploughability, and aeration status. It is an important aspect of soil quality and an important indicator of soil quality.
A detailed analysis of the soil quality and utilization patterns in the study area by using a soil nutrient fastness tester revealed that with the increase and decrease of the reclamation time, the soil bulk density increased first and then decreased, and the soil nutrients were constant except for the available potassium. The increase, only the content of available potassium is constantly decreasing, the reduction rate in the early stage of opening is faster, and gradually tends to be flat later. The total salinity and conductivity of the soil in the two soil layers decreased with the increase of the number of years of reclamation, and there was a significant difference among the reclamation years. The total salt content of the upper layer soil was significantly higher than that of the lower layer.
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detailed description:
Appearance: white or milky white powder
Viscosity: 830-880mpa.s
PH value: 10-11
Storage period: 6-12 months at normal temperature
Product features
1. Low glue consumption, 22-25g / m2 on average
2. Strong initial adhesion, paper out adhesion of conveyor belt
3. Water content of cardboard is low, water content test is 8-10
4. The drying speed is fast, and the next process can be started 30 minutes after the machine is off
Suitable for paper and machine
1. Suitable for paperboard: three layers and five layers of paperboard
2. Paperboard mounting: A, B, C, e, F, n waves, etc
3. Surface paper type: gray base white board paper, cow leather, white card and other types of paper
4. Applicable model: for manual glue machine, semi-automatic or full-automatic veneering machine
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