| Cite this article: | 鄢碧鹏,王磊,郑春来,等.渐缩式比例施肥器的设计与试验[J].灌溉排水学报,2019,(11):-. |
| yan bipeng,wang lei,zheng chunkai,et al.渐缩式比例施肥器的设计与试验[J].灌溉排水学报,2019,(11):-. |
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| DOI： |
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| Design and Test of the Shrinking Proportional Fertilizer Applicator |
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yan bipeng, wang lei, zheng chunkai, ye fei
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College of Environmental Science and Engineering, Yangzhou University
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| Abstract: |
| 【Objective】An effective method was proposed for the solution of the problem of fertilizer concentration decline with time in pressure difference tank, in this paper, 【Method】a gradually shrinking proportional fertilizer applicator with injecting fertilizer into pipeline was developed, which can be used for proportional fertilization. The application method we adopt is to put a deformable fertilizer bags into the pressure tank, and setting the pressure relief valve between the two points that the fertilizer bag, the pressure tank connect 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 results showed that 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 0.47m, 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 is also suitable for various pipeline pressures. It can be applied to facility agriculture sprinkling irrigation, drip irrigation system dosing and apply fertilizer. |
| Key words: proportion; fertilizer applicator; fertilizer concentration; facility agriculture; |
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