poster - International Conference of Agricultural Engineering

3. Results and discussions
Table 1 shows the water content in soil and number of observations of resistance to
penetration and location where they were taken.
The wet soil due to rainy season favored the collection of data and 90 observations have
records of resistance to penetration to a depth of 600 mm. However, data collection after
planting at some points did not reach a depth of 600 mm and was considered incomplete
observations. It can be seen in Table 1 that after planting soil water content in was on
average 34% lower than in the data collected before soil tillage operations. This reduction in
soil water increased resistance to penetration, without necessarily increasing the
compaction, but resulting in more than 45% of the number of incomplete data, and in some
cases the penetration depth of the equipment could not exceed 100 mm because the high
resistance to penetration of the soil.
TABLE 1. Values of soil water content and data used collected from the penetration
resistance
Period Treatments N SWC (%) CV(%) TO IO Data used (%)
Before tillage ------------ 30 22,55 a 9,95 90 0 100,0
After planting
TPSD zone 15 14,95 b 20,65 45 25 44,4
PZ zone 15 14,71 b 15,54 45 19 57,7
Means followed by lower case in the same column do not differ statistically among themselves (Duncan, p