Design and testing of a soil replacement deep-turning plow for continuous peanut soils
For peanut yield reduction by continuous cropping,soil layer replacement were designed by deep turning plow.The design and test focused on mechanical design and motion analysis of overturning mechanism of the replacement,and force analysis of plow body surface.To verify the operational performance of soil displacement deep turning plow,three-factor quadratic rotary orthogonal combination field pre-test was carried out with plow-share mounting angle,plowing width and operational speed as the test factors.Coefficient of variation of plowing depth,vegetation stubble coverage and cfa rate as performance evaluation indexes were investigated to obtain the re-sponse surface model of each factor.Influence of each factor was studied on performance aiming to the lowest coeffi-cient of variation of plowing depth,the highest vegetation stubble coverage and the highest cfa rate.Factor optimiz-ing results indicated as follows:plow depth coefficient of variation of 3.35%,vegetation residue coverage of 93.95%,and turnover rate of 94.39%at a plowshare mounting angle of 25.58°,a plowing width of 526.01 mm,and an operat-ing speed of 5.82 km/h.These optimum results were based on the optimised performance of the plowshare model.Then by 5 gradients of operation speed set for field verification tests,the validation test showed that when soil layer replacement deep turning plow was operated with the optimal plowshare installation angle and plowing width,the co-efficient of variation of plowing depth was less than 4%,the residual stubble coverage rate was greater than 90%,and cfa rate was greater than 90%at each speed gradient,which met the quality requirements of turning plow opera-tion.In 2 consecutive years of application on continuous peanut land,the peanut yield increased by 21.2%in 2022,and 16.9%in 2023.
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