Evaluating soil tillage system effects on growing of Eucalyptus saligna coppice and soil resistance of different textures
Keywords:
Soil bulk density, Soil penetrometer, Harrowing, RippingAbstract
On commercial plantation of Eucalyptus saligna, belonging to Suzano Paper and Cellulose Co., two Oxisol (coarse and clayey textured) were selected. Both soils were submitted to mechanized harvesting, and coppice was 1 year old (clayey soil) and 2 years old (coarse soil), when soil tillage systems were performed: harrowing and subsoiling. Undisturbed soil samples were collected at 50 cm from tree lines and at three depths: 0 to 10, 10 to 20 and 20 to 30 cm to determine bulk density, and soil resistance to penetrometer were measured until 60 cm deep on the tree line and between lines. Plants had its DBH and total height measured before and after soil was tilled. Both soil tillage systems increased eucalyptus coppice growth, and a good correlation was obtained between soil resistance to penetrometer measured at the distance of 125 cm from the tree line and at 25 cm of soil depth ( r2 = 0,615 ) and plant height. On the coarse soil, harrowing decreased plant development, mostly due to increasing macroporosity.
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