Expanding implementation of an on-line measurement system of topsoil compactionin loamy sand, loam, silt loam and silt soils.

摘要

A previously developed model for on-line prediction of soil compaction indicatedas bulk density (BD), was limited in use for a sandy loam field. This study wasundertaken to investigate the possibility of modifying this model for new soiltextures, namely loamy sand, loam, silt loam and silt soils. Using the on-linemeasurement system of BD, measurements were carried out in four fields withdifferent average textures of loam, sandy loam and silt loam and silt loam/siltfields. The on-line measurement system used consisted of a subsoiler, whomdraught (D) was measured with a single shear beam load cell and depth (d) wasmeasured with a wheel gauge consisted of a swinging arm metal wheel equippedwith a linear variable differential transducer (LVDT). The soil gravimetricmoisture content (MC) was measured with the oven drying method. The on-linemeasured BD was compared with measured BD with Kopecki rings (core samplingmethod) (736 samples), to validate the potential use of this sensor in the newstudied soil textures.