Evaluation of Variable Rate Technology for Fertilizer Application in Permanent Pastures
Evaluation of Variable Rate Technology for Fertilizer Application in Permanent Pastures作者机构：ICAAM Rural Engineering Department University of Evora Evora 7002-554 Portugal
出 版 物：《Journal of Agricultural Science and Technology(A)》 (农业科学与技术（A）)
年 卷 期：2011年第1卷第4X期
页 面：489-499页
学科分类：08[工学] 090101[农学-作物栽培学与耕作学] 09[农学] 0901[农学-作物学] 0835[工学-软件工程] 081202[工学-计算机软件与理论] 0812[工学-计算机科学与技术（可授工学、理学学位）]
主 题：Calibration centrifugal fertilizer spreader, evaluation, precision agriculture, variable rate technology.
摘 要：This paper describes the field tests carried out to evaluate the new Vicon RS-EDW centrifugal fertilizer spreader, to be used in Precision Agriculture. The results of initial dynamic calibration tests showed a significant and systematic difference between the application rates of the two discs （about 20%）. This difference had to be corrected by the manufacturer that carried out the necessary changes to the electric actuators. The fertilizer spreader had good distribution homogeneity, considering different working velocities and different positions in the parcel. The pattern distribution curve for 18% super phosphate fertilizer led to an effective working width of 28 meters, with a coefficient of variation of 15%. The longitudinal test, under experimental working conditions led to a machine delay time of 6-7 seconds. The results show an actual fertilization application density between 74%-90% of that determined for each location. These results confirm that the spreader can be used to spread fertilizer differentially in the field.
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