Moisture is not only a necessary substance for plant photosynthesis to form carbohydrates, but also an indispensable constituent of the plant itself. Soil moisture is not only the main source of water absorption by plants, but also an indispensable medium for chemical, biological and physical processes in soils. It is an important factor in soil fertility. Therefore, it is important to conduct soil water status measurement and master the law of soil moisture change, which is of great significance to the real-time service and theoretical research of agricultural production.
The drying weighing method is a traditional method for measuring soil moisture by an agrometeorological observation station. The layer-by-layer average obtained by taking four replicates in the same site is the authoritative data for obtaining soil moisture. The 30 basic agro-gas stations in Henan Province measured the soil moisture in the crops at 8:00, and the sampling depth was 0250 cm. There were 5 layers per 10 cm, and 4 replicates were taken at a time. Among them, 11 stations also carried out soil moisture measurement in fixed sections (the depth of the station is 50 cm in 9 stations, and the depth of the two stations in Zhengzhou and Nanyang is 100 cm). The measurement method is the same as that in the crop section. The data used in this paper are from the original records of soil moisture sampling in 2007. In order to facilitate the comparison with the automatic soil moisture analyzer, the comparison object is the soil volumetric water content of each section. For the fixed section and the crop section, the relative errors of soil moisture records of different stations, different soil acquisition dates, different soil layers and different repeats were obtained, and the statistical average annual relative error was < 2.5%, < 3. 0% respectively. , < 5. 0%, < 6. 0%, < 7. 0% of the number of stations, sampling ratio and vertical variation of error. Among them, the relative error of one sampling is calculated by the following formula: Er=â–³x/x*100%, where Er is the relative error; â–³x is the absolute error, that is, the absolute value of the difference between the sample value and the sample mean; x is the sample Mean. The annual average relative error of a soil layer is the average of the relative error of the same soil layer at different stations in a year. The provincial average error is the mean of the annual average relative error of each layer.
Soil Moisture Analyzer: The Soil Moisture Analyzer, also known as the Soil Moisture Analyzer, is the most important part of the soil moisture and drought management system. The soil moisture detector inserts a moisture sensor directly into the soil and then samples the value of the soil moisture content. The soil moisture and drought management system includes soil moisture detectors, soil nutrient testers, etc., because the soil moisture content will affect the absorption of soil nutrients, so the soil nutrient content can indirectly know whether the soil moisture is sufficient. The soil moisture detector adopts large-screen Chinese liquid crystal display, and the membrane type button can display the water value and the number of groups in real time. Different models have different functions. The TZS-II type has GPS positioning function, and the actual soil moisture is also The latitude and longitude information can be displayed in real time, reflecting the spatial difference of soil moisture. The soil moisture detector realizes the automatic sampling and processing of moisture content and three-dimensional position information, and processes the signals of the sensors and GPS receivers and calculates corresponding data, which is not only conducive to the implementation of water-saving irrigation, but also accurate water supply is also beneficial. Improve crop yield and quality.
Beijing Jiuzhou Space Science & Trade Co., Ltd. specializes in the production and sales of online dust noise automatic monitor, tubular soil moisture temperature monitor / multi-layer soil monitoring system, mobile automatic runoff observation system, online soil erosion monitor, portable surface slope runoff automatic Monitor, small basin automatic sediment monitor, small diameter flow sediment automatic monitor, steel ruler water level gauge, automatic rainfall station, portable flow meter, portable weather station, soil nutrient speed meter, gas sampling cylinder, lubricating oil level III Filter barrels and other products, welcome new and old customers to come to consult
We are specialized in plush toy since 1993. We are a very strong OEM&ODM team. Annually, there are more than 250 new items for our customer to select.Till now, there are more than 8500SKU.
We have a very strong OEM&ODM designing team. Annually, we will design more than 200 new items for our customer to select. Customized design is welcomed.
Here we provide one stop service from design patterning, sampling, manufacture and quality control. to ensure Safe, Excellent QUALITY & BEAUTIFUL products
Our toys are followed strictly international standards such as EN71 &ASTM963. We have passed BSCI, Sedex certificate.
Puzzle Toys,Think Learn Toys,Creativity Toys,Plush Jigsaw Toys
Ningbo Dikai Imp&Exp Co., Ltd , https://www.longkaitoys.com