Estabilidade estrutural de cambissolos em função do tempo de cultivo com meloeiro.

Abstract

The work had objective to measure the structural stability of Typic Haplocambids with differents culture times with muskmelon. Soil samples had collected, in the depth of 0-25 cm, in three farms, considering 4 times of use: native area and areas with 1, 2 and 3 years. The samples had analyzed how much to the stability of aggregates in water. On the basis of the data of added by class the weighed average diameter was calculated. The data had submitted to the variance analysis for F test, considering a completely randomized experimental design, in factorial 3 x 4 (3 farms and 4 times of use), with 3 repetitions. The averages had contrasted by Tukey test 5% of probability. Concluded that the culture time provoked reduction of the steady aggregates size in water. It has significant difference for the distribution of aggregates for size between the studied agricultural farms. The average size of aggregates, defined by the weighed average diameter (average value of 2,10 mm) indicates that in the current period of training the soil aggregates with reasonable size and resistant to the spalling and dispersion.