Studys On The Performance Of Seeding And Replanting For Industrial Seeding System

At present, vegetables facility cultivation could result in continuous cropping of soil.Generally it is solved by rotating crop, but much soil is required. Grafting seedlings could not onlyovercome the plant disease for continuous cropping, but also enhance output about 20%. It is aneffective and sustainable cultivation.The automatic grafting technology had developed in China, but it is not still perfect in theindustrial growing system.Although there are many industrial growing seedling center in China,grafting seedlings still depends on manual operation, which exists questions of productivity andsurvival rate.Aiming at the problem above, therefore, in order to solve seeding precisely for big seeds andreplanting for grafted seedlings, this research developed key equipments which were the air-suctionprecision seeding units, and carried on experimental analysis; and designed the mechanicalreplanting device for grafted seedlings of root cutting, and carried on experimental analysis.Theresearch did the basic work in order to realize the industrial grafted seedling system for vegetable,and has the following main characteristics:1 The design of enlargeing the size of suction hole to meet seeding precisely for big seeds,according to physical properties for grafted seeds.2 The structure of the air-suction precision seeding units is simple, operate easily, and mayrealize seeding precisely, save seeds, and make the management of seedlings convenient.3 The air-suction precision seeding units maY seed common vegetable seeds and grafted seedsby means of replacing the suction seeds board and tubular seeding unit.4 The mechanical replanting units for grafted seedlings of root cutting solved the question ofmanual operation for grafted seedlings.5 The mechanical replanting device may replant five seedlings at the same time.The main research work is as follows:1 The research analyzes the physical characteristics of common vegetable seeds and graftedseeds by measureing the shape and weight of seeds.2 Seeding performance of air-suction precision seeding units is effected on seeds types,vacuum degree in gas chamber and diameter of suction hole; carrys on experimental analysis withregression analysis, and considers the suction ratio, one seed rate and rebroadcast rate and so on. 3 The research checks the suction ratio and one seed rate by changing vacuum degree anddiameter of suction hole with the tubular air-suction precision seeding unit4 The research provides design concept and theory basis for the industrial grafting seedling ofvegetable system.The main research conclusions are as following:1 When vacuum degree in air chamber is stable, The main factors, which are vacuum degreeand diameter of suction hole and seeds type, affect seeding performance..2 When diameter of suction hole is stable, and enhancing vacuum degree in chamber, thesuction ratio is increased, but one seed rate could be descended.3 Because of different type of seeds, it is different to get perfect suction ratio and one seedrate.4 Aiming at stock seeds, it could improve the suction ratio and one seed rate by enlargingdiameter of suction hole and enhancing vacuum degree in chamber; but in order to get perfectsuction ratio and one seed rate, it should be the suitable range for diameter of suction hole andacuum degree for scion seeds.5 The experimental analysis indicates the mechanical replanting device for grafted seedlingsof root cutting may meet the design demand.When stock is cucurbit seedlings, and it is 4.0mm forhole diameter of soil and 0～30°for the bending range of stock stem, it could not influence thesuccess ratio.