Field Measurements of Spray Drift Potential in Strawberry
Passive drift samplers were mounted on a frame, attached to the sprayer, 2 m behind the nozzles of different strawberry spraying systems.The spraying systems were operated at a common tractor speed of 7.2 km/h.At calm wind conditions this forward speed corresponded to a wind speed of approximately 2 m/s causing potential drift from the nozzles.Drift samplers, made of cotton and acryl thread of 2 mm diameter and 3 m long, were mounted horizontally on a frame at different heights up to 2.0 m above the ground.Measurements compared at different growth stages in May (1) and August (2) demonstrated that drift was reduced by 75% due to the increased filter effect of the leaf density in August.The drift from a tunnel sprayer was 10 and 13% of a reference sprayer when using an end-curtain and 55% and 37% without any end-curtain at growth stages 1 and 2, respectively.At growth stage 1, using 80 015 nozzles at 200 mm from the plants gave a significant increase in drift compared with the similar nozzles at 100 mm from the plants.At growth stage 2 the reference sprayer at 1.0 MPa gave a significantly higher drift than at 0.5 MPa.Using air injection nozzles (ID nozzles) reduced the drift significantly.
wind speed sampling method nozzle type nozzle distance nozzle pressure growth stage air induction nozzle field measurement
N.Bjugstad P.Hermansen
Department of Mathematical Sciencies and Technology, Norwegian University of Life Sciencies, Postbox 5003, N-1432As, Norway
国内会议
北京
英文
34-45
2010-09-15（万方平台首次上网日期，不代表论文的发表时间）