Push cone eletrônico de baixo custo para estudo da resistência mecânica ao desenvolvimento radicular das plantas

Abstract

Abstract: Abstract: This work describes the construction, calibration and tests of a Low Cost Electronic Push Cone (LCPC) for the study of mechanical impedance to root growth and plant emergence. The LCPC may be used to determine Cone Index up to a 40 mm depth. The LCPC developed is made up of three parts: mechanical device, electronic circuit and software. The mechanical part is composed, basically, of an aluminium body that shelters a cone. The force for penetration in the soil is supplied by a spring of linear characteristic. The electronic part consists of a displacement sensor that is used to measure the spring's displacement. An electronic circuit makes the interface of the signal with a microcomputer. The software has the function of controlling the acquisition, storage and processing of the data. The LCPC presented good results in the calibration and in the field tests.

Use of penetrometers in agriculture: a review

“…When it is pressured against the soil, a helical spring of linear compression indicates the SPR values (CAPPELLI et al, 2001). Also, it may be used with a digital data storage system, obtaining point readings every 1.0, 2.5, or 5.0 cm penetration (Figure 2b).…”