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The purpose of soil testing and formula fertilization is to control the soil fertility status, according to the characteristics of different crops need fertilizer and agricultural production requirements, the implementation of a balanced application of organic fertilizer and various chemical fertilizers in an appropriate ratio, improve fertilizer nutrient utilization, thus promoting agricultural production High-yield, high-quality and efficient scientific fertilization. Soil testing and formula fertilization, as an advanced agricultural technology promoted by the United Nations throughout the world, provides technical support for the effective use and promotion of the core technology for the establishment of a scientific fertilization system - soil testing and formula fertilization, so as to adapt to the agricultural sector for soil fertigation. guidance and management of crop fertilizer, agricultural land to meet the current shortage of resources, to achieve high-quality production in agriculture and increase agricultural production, should be pressing problem.
Soil testing and fertilization information query Pocket PC is a high-tech product integrating functions of handheld computers, global positioning systems (GPS), soil information inquiry, soil testing and fertilizer application consultation, mobile phones and digital cameras. The soil types, physicochemical traits, nutrient content, and abundance conditions of arbitrary plots, information on fertilization schemes for multiple crops and varieties can be found with just one click. The system can run on a variety of Windows Mobile as a platform for handheld computers and smart phones, navigation maps, mobile phones, digital cameras and other functions and parameters differ depending on randomness.
The valve is a pipeline accessory used to open and close the pipeline, control the flow direction, adjust and control the parameters (temperature, pressure and flow) of the transmission medium. According to its functions, it can be divided into shut-off valve, check valve, regulating valve, etc.
The valve is a control component in the fluid delivery system, which has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest globe valves to various valves used in extremely complex automatic control systems.
The valve can be used to control the flow of various fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The valves are also divided into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome molybdenum steel valves, chrome molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non-standard valves, etc.
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