Abstract
Healthy vegetable seedlings are surviving seedlings with good biological characteristics. Selective planting of healthy seedlings in the mechanized transplanting process can effectively avoid the reduction in yield caused by missed planting. Aiming at the current transplanting machinery that cannot achieve the selective planting of healthy seedlings, a healthy seedling intelligent sorting and transplanting system was proposed. The system consisted of a seedling delivery mechanism, sorting mechanism, photoelectric sensor, image sensor, PLC control system, and computer control system. It can realize automatic transmission of seedling trays, automatically identify the information of healthy seedlings in the trays and selectively transplant them. Also it can reduce the missed planting rate caused by the poor quality of plug seedlings after planting and the lack of seedlings in the hole. A sorting test of plug seedlings was carried out for the age-appropriate pepper plug seedlings cultivated in the factory. The results showed that the system had an average recognition accuracy rate of 89.14% and an average sorting success rate of 93.20% in the process of sorting suitable age pepper plug seedlings. The whole system can identify, sort and transplant the plug seedlings of appropriate age according to healthy information, and effectively avoid missing planting. This research can provide technical support for the intelligent upgrade of transplanting equipment. Keywords: intelligent agriculture, sorting and transplanting system, healthy vegetable seedling, design, experiment, image, sensor DOI: 10.25165/j.ijabe.20211404.6169 Citation: Li M Y, Jin X, Ji J T, Li P G, Du X W. Design and experiment of intelligent sorting and transplanting system for healthy vegetable seedlings. Int J Agric & Biol Eng, 2021; 14(4): 208–216.
Highlights
The missing planting in the transplanting of plug seedlings is the main factor causing the yield reduction[1]
This study selected Pepper Plug Seedlings as the system operation object and designed a healthy seedling sorting and transplanting system. 601 type pepper seedlings were selected to cultivate pot seedlings, the plug tray size of factory seedling usually includes 21, 50, 72, and 128 holes, among which the seedling tray size of 21 holes has wider seedling spacing and less leaf crossing, which is conducive to image detection
In order to test the effects of the designed system, an indoor experiment was carried out
Summary
The missing planting in the transplanting of plug seedlings is the main factor causing the yield reduction[1]. The problem of missing planting mainly relies on manual inspection and timely replenishment of seedlings, but this method is easy to damages the growth consistency of transplanted seedlings and causes subsequent mechanized production problems[4,5,6]. Khadatkar et al.[21] developed a set of automatic seedling picking end-effector based on machine vision technology, which could position seedlings through vision and improve the grasping accuracy and speed of the end-effector. Liu et al.[24] used the color characteristics of vegetable seedlings to propose a rapid
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