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| DOI：10.13522/j.cnki.ggps.2019116 |
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| Design and Test of the Shrinking Proportional Fertilizer Applicator |
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YAN Bipeng, WANG Lei, ZHEN Chunlai, YE Fei
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College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
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| Abstract: |
| 【Objective】The purpose of this paper is to find a solution of the problem of fertilizer concentration decline with time in pressure difference tank. 【Method】A gradually shrinking proportional fertilizer applicator with injecting fertilizer into pipeline was developed, which can be used for proportional fertilization. The adopted was application method to put a deformable fertilizer bags into the pressure tank, in the middle of the connect line of the fertilizer bag, with the main pipeline. Based on the theoretical analysis of its parallel characteristics, a prototype was developed to test the changes of fertilizer concentration under four different pipeline conditions.【Result】The deformable fertilizer bag can separate water and fertilizer, and had an equivalent replacement for the fertilizer and water. It acted as a parallel pipeline system. When the structure of the hydraulic system was decided, the fertilizer proportion was a constant that was only related to the diameter of two branches and the local resistance coefficient. The maximum deviation of fertilizer concentration in the main outlet pipe was 4.7% under the same working condition and in different time. The maximum deviation of the average concentration was 3.5% when the working condition of the incoming water pipeline changed. That was uniform fertilization. The maximum head loss of the fertilizer applicator was 0.47 m, and the fertilization proportion can be adjusted in the range of 0%~10%.【Conclusion】The developed gradual shrinkage proportional fertilizer applicator has the characteristics of stable fertilizer concentration and low head loss, while it was also suitable for various pipeline pressures. It can be applied to facility agriculture sprinkling irrigation, drip irrigation system dosing and apply fertilizer. |
| Key words: fertilizer; proportional fertilization; deformable fertilizer bag; facility agriculture |
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