| 1 | Performance evaluation of mechanical blossom thinning in trunk type pear orchard显示文摘In order to yield a marketable product,hand fruit thinning(HFT)has become the major but costly management practice in modern pear planting.Two kinds of new blossom thinners for pear blossom thinning were developed,which are tractor-mounted three arms blossom thinner(TTBT)and hand-held electric blossom thinner(HEBT).Four treatments for 24 trunk type‘Cuiguan’pear trees(7 years)were tested.They are TTBT combined with HFT,HEBT combined with HFT,hand blossom thinning(HBT)combined with HFT,and HFT only.Pear trees were divided into 4 groups equally.Four indexes were used to evaluate the test:flower reserve rate,fruit set rate,work efficiency and cost,fruit yield,and quality.Pear canopy was divided into the inner,middle,and outer 3 layers in the top view.20 inflorescence samples were selected for each layer.Field tests showed:there was no obvious difference in quality between mechanical blossom thinning and HBT,and the working stability of TTBT was higher than other treatments.Mechanical blossom thinning decreased the fruit set rate to a certain degree,but did not reduce the yield and quality of harvesting.TTBT could save 61.35%operation time compared with HFT,and the profitable area was 5845.76 m2.TTBT is suitable for large-scale sparse layer trunk-type pear orchards.HEBT could save 36.01%operation time compared with HFT,and the profitable area was 663.96 m2.HEBT is suitable for small and medium-sized trunk-type pear orchards.Blossom thinning can improve the average weight of high quality fruit and brix of sugar solids. | Xiaohui Lei Xiaolan Lyu Meina Zhang Daipeng Lu Shilin Wang Youhong Chang Dexin Zhong Tianbing Shen | 2021 | International Journal of Agricultural and Biological Engineering2021，14，4： | 1 |
| 2 | Design of a fixed-pipe cold aerosol spraying system for chemical application in greenhouse显示文摘Since the high temperature and humidity in a closed environment,pests and diseases are infecting and spreading seriously in greenhouses.However,the prevention and control of pests and diseases in greenhouses are still dominated by knapsack sprayers.For those reasons,based on twin-fluid atomization,droplet dispersion,and constant pressure transportation technique,a fixed-pipe cold aerosol spraying system composed of the control unit and the fixed-pipe spraying unit comes into being.The indoor pipeline execution unit of the spraying system could be interfaced with the liquid-supply or gas-supply equipment such as the liquid pump,air compressor,and tank of the outdoor master control unit through a quick coupling,which could realize the separation of operator and sprayer in hermetic greenhouse.The atomization of twin-fluid nozzle and the droplet deposition and distribution of the spraying system in greenhouse were tested.Results showed that about 70%of the particle size of the twin-fluid flow nozzle concentrated in the range of 32-65μm under the spraying air pressure ranged from 0.2 MPa to 0.4 MPa.When the air pressure was 0.2 MPa,0.3 MPa,and 0.4 MPa,the wind speed at the nozzle outlet reached supersonic speed,as the corresponding VMD of droplets were 45.6μm,43.2μm,and 36.8μm,respectively.The higher the air pressure is,the more uniform the spray deposition is in the greenhouse.When the air pressure was 0.2 MPa,0.3 MPa,and 0.4 MPa,the CVs of the liquid deposition in the greenhouse were 109.1%,62.6%,and 35.4%,respectively.The droplets produced by the spraying system will rapidly disperse into the whole greenhouse.The average deposition was 2.99μL/cm2 in the front area of the nozzle,the deposition was 1.24μL/cm2 in the area between two nozzles,and the deposition was 0.58μL/cm2 in the area behind the nozzles.The spraying system is characterized by the distribution of spraying liquid throughout the entire greenhouse. | Shilin Wang Daipeng Lu Xue Li Xiaohui Lei Yuxin Tang Xiaolan Lyu | 2023 | International Journal of Agricultural and Biological Engineering2023，16，1： | 0 |
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