Cutting forces measurement of the stumps root of eucalyptus species / Medição de forças no corte de raizes de cepas de especies de eucaliptos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In the areas of pines and eucalyptus reforestation where the elimination of the stump is not endorse through burning or intensive soil preparation, planting of the new sprout was done in interline of stumps. It was understood that after 7 years, when the forest reaches its harvest age, the stumps of the previous plantation would have been decomposed by the action of microorganisms. However, it was observed that the stumps of previous crop remained in the field. Now the problem with excess of stumps in area of forest growing cause delay in filed operations, breakdown and reduction of equipments operational life and cost rising of forests production. The decomposition process varied, as function of a series of factors such as genetic material, humidity, temperature, etc. The mechanical methods for stumps elimination in wide scale available in the market are expensive and slow, besides provoking a lot of movement of organic material and soil. The present research project had as the main objective characterizing the mechanical resistance the eucalyptus stumps roots, to obtain data for the design of equipment for stumps elimination. From 7 year-old stumps obtained in the field, the specific forces necessary to cut roots located to 400 depth mm and the a radius of 500 mm from the center of the stump was determined. In the experimental work, cutting tools with 3 different rake angles and tools angles and stumps originating from of trees cultivated in clay and sandy soils were uded. An evaluation of the root distribution around the stump was also realized. The results showed that, does not exist a significant difference among the roots as function of its location around the stump, and in relation to the soil type where the tree was cultivated. The field-test also show that the specific force to cut of the roots is very a low influenced by the rake angle or the tool angle, due mainly to the aleatory position of the roots in relation to line of forward displacement of the tool.

ASSUNTO(S)

solos - manejo soil conservation soil tillage maquinas agricolas eucalipto solos - conservação agricultural implement

ACESSO AO ARTIGO

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