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Evaluation of Variable Rate Technology for Fertilizer Application in Perm.nent Pastures

j.urnal of Agricultural Science and Technology(A) 2011年第4X期1卷 489-499页

作者： j. m. serrano j. m. peca shahidian ICAAm Rural Engineering Department University of Evora Evora 7002-554 Portugal

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 dynam.c calibration tests showed a significant and system.tic difference between the application rates of the two discs （about 20%）. This difference had to be corrected by the m.nufacturer that carried out the necessary changes to the electric actuators. The fertilizer spreader had good distribution hom.geneity, 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 m.ters, with a coefficient of variation of 15%. The longitudinal test, under experim.ntal working conditions led to a m.chine delay tim. of 6-7 seconds. The results show an actual fertilization application density between 74%-90% of that determ.ned for each location. These results confirm.that the spreader can be used to spread fertilizer differentially in the field.

关键词： Calibration centrifugal fertilizer spreader, evaluation, precision agriculture, variable rate technology.

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Developm.nt of a Data Acquisition System.to Optim.zing the Agricultural Tractor Perform.nce

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j.urnal of Agricultural Science and Technology(B) 2011年第5期1卷 756-766页

作者： j. m. serrano j. O. peca S. shahidian m. C. Nunes L. Ribeiro F. Santos ECT- Rural Engineering Departm.nt University of Evora ICAAM Nficleo da Mitra Apartado 94 Evora 7002-554 Portugal Laboratory of Electrical m.asures INETI Portugal Agronom.e and Rural Engineering Departm.nt UTAD Portugal

A novel data acquisition system.was successfully integrated on-board the m.ssey Ferguson 3,000 series agricultural tractors for m.asuring tractor-im.lem.nt perform.nce. A com.ercial load cell was incorporated into the existing system.for the needed tractor-im.lem.nt perform.nce, m.asurem.nts. This system.is capable of m.asuring, displaying and recording, in real-tim., the tractor＇s theoretical travel speed, the actual travel speed, the engine speed, the fuel consum.tion rate, and the drawbar pull. Static calibration tests on various associated sensors for the required m.asurem.nts show excellent linearity with correlation coefficients that are close to 1. The developed system.was extensively and successfully field dem.nstrated for tractor-im.lem.nt perform.nce with offset disc harrows on dry, undisturbed loam. soils. Under these conditions, a ratio of tractor power to im.lem.nt width is suggested. The data also show the existence of a linear relationship between fuel consum.tion per hectare and specific draught, for the 4 to 9 kN m.-1 range, which suggests the possibility of extending the Am.rican Society of Agricultural and Biological Engineers m.del of draught prediction to forecast fuel consum.tion. The configuration of the tractor-harrow com.ination, based on the m.asurem.nt of the draught required under operational conditions, provides the m.nufacturers with a reliable indication of the recom.ended power required for each harrow m.del. With this type of inform.tion farm.rs can m.ke decisions regarding selection of a suitable tractor-im.lem.nt com.ination for their farm.. As a consequence, there is im.roved tractor-harrow productivity and field efficiency.

关键词： Data acquisition system datatronic tillage tractor im.lem.nt perform.nce

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