In terms of types, organic fertilizers (including farmyard manure, manure, green manure and cake fertilizer) are most suitable for base fertilizer application, and nitrogen, phosphorus, potassium and micro-fertilizer are also suitable as base fertilizers.
To determine the amount of base fertilizer application, especially the amount of fertilizer applied, soil fertility must be considered. In soils with organic matter below 1.2%, organic fertilizer of more than 3 cubic meters per mu should be applied. When the available nitrogen, phosphorus, potassium and trace elements in the soil are lower than the effective threshold of crop fertilization, the fertilizer should be selected first, especially in the early stage of the crop.
The specific dosage of various fertilizers as base fertilizer can be determined by reference to the comprehensive results of field fertilization test results and target yields in the local area. Generally, the total amount of nitrogen fertilizer on the high-fertility soil is about 30%, and the medium and low-fertility soil is 50%-70. The nitrogen fertilizer is used as the base fertilizer, and the phosphorus, potassium fertilizer and micro-fertilizer are all applied as much as possible.
From the perspective of fertilizer varieties, ammonium bicarbonate in nitrogen fertilizer, calcium, diammonium, calcium magnesium phosphate fertilizer, three materials in potassium fertilizer, potassium chloride, potassium sulfate, grass ash in potassium fertilizer, zinc fertilizer in manganese fertilizer, manganese fertilizer, etc. Suitable for the base fertilizer.
In terms of depth, the general base fertilizer should be applied to the entire plough layer, that is, 15-20 cm depth. For organic fertilizer, nitrogen fertilizer, potassium fertilizer, and micro-fertilizer, it can be mixed and evenly spread on the surface, and then ploughed into the soil to achieve uniform mixing of the fertilizer and the whole ploughed soil, so as to facilitate the absorption and utilization of nutrients by different root layers of the crop. Phosphate fertilizer is poor in mobility and is easy to be fixed after application to the soil and loses its effectiveness. Therefore, it should be applied in two layers at the bottom, that is, the lower layer is applied to a depth of 15 to 20 cm, and the upper layer is applied to a depth of about 5 cm. The upper layer mainly meets the demand for phosphorus in the seedling stage, and the lower layer supplies the phosphorus nutrition in the middle and late stages of crop growth.
Specification
The system with solar power generation, charging and storage devices. It can supply power without any external power supply. It can start and stop while necessary.
It can clean without water and cleaning medium.
The cleaning area is large, one-way running distance is 800-1000 M.
The cleaning effect is good, the efficiency is above 95%.
Strong adaptability, suitable for roofs, greenhouses, plains, hills, deserts, lakes and other areas and terrains, the overall protection level of the control system is IP55, all-weather work.
The cleaning part is made of macromolecule material which is made by soft spiral brush it won`t damage the toughened glass on the surface of the PV module.
The cleaning time and frequency can be set according to different geographical and seasonal conditions.
The system has two operation modes: fully automatic remote control mode and local manual control mode, the two modes can switch each other.
It equipped with wireless module, can realize remote control and telemetry functions.
The mechanical structure is simple, reliable and stable, provide warranty for 2 years.
Standardization and modularization of equipment parts, easy to be transported, installed and debugged.
Equipped with infrared temperature sensor group, which can measure the temperature of silicon wafer and analyze the power of single board.
Significant economic benefits, the investment is about 0.1-0.15 RMB/W, effectively enhance the power generation efficiency of 6%--25%, can recover the investments in 1-2 years .
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Hebei Honde Plastic & Metal Co., Ltd. , https://www.foundation-system.com