Effects of working depth on mechanical aeration of a grassy soil and its impact on the plant root behavior
The effects of the working depth of mechanical aeration of a grassy sward were performed at a golf green in Tunisia. The study focused on measurements of roots length, soil resistance to penetration and its bulk density before and after passage of a hollow tines aerator working at a depth of 6 cm and 12 cm treatments. The perforation density of 250 holes/m2 was applied for the two treatments. Results showed that mechanical aeration was a means of loosening adequate for grassy soils which preserved the existing culture. Indeed, six days after aeration, there was a reduction iaeration, there was a reduction in soil resistance to penetration compared to the initial state for both treatments. This was also observed at 21 and 40 days after aeration. However, 53 days after aeration, the soil returned to its original state before aeration. Bulk density also showed the same pattern. In parallel, the roots were marked by an increasing development for the first three measurement dates to stabilize at 53 days after aeration. However, it should be noted that aerating at 12 cm of depth, provided the best results of the measured parameters.
Keywords: mechanical aeration, perforation depth, soil resistance, bulk density, roots length.