Microbiota de diferentes sistemas de uso do solo no município de Rio Largo, Alagoas

Abstract

ABSTRACT

The objective of different soil use systems was to evaluate their biological attributes at the Campus of Engineering and Agricultural Sciences of the Federal University of Alagoas, located in the municipality of Rio Largo - AL, whose soil is classified as Cohesive Yellow Latosol with medium texture. Collections were carried out in three land use systems (SUS). The first, with natural forest (soil cover condition) (SM), the second with sugar cane (SC) cultivated since 2009, having received the commendations for the crop, and the third under sabiá forest (BS) that was introduced replacing the natural forest in 1999. Biological analyzes were carried out. The physical-chemical analyzes of soil were carried out by the Soil, Water and Plant Laboratory of the Engineering and Agricultural Sciences Campus of the Federal University of Alagoas. Counting of cultivable microorganisms (bacteria, fungi, actinomycetes) and estimation of cellulolytics and ammonifiers were performed. The number of CFU was significantly lower for SM 6,867x106 whereas for BS and SC they did not differ significantly (7,176 and 7,503 x106 respectively), the highest values were found in SC. Among the fungi, a greater number of CFU was observed in the fifth collection in SM (5.335x105). For actinomycetes, the highest and lowest CFU values were observed in SC (3.527 and 5.118x104 respectively). The functional groups of microorganisms (cellulolytic and ammonifiers) quantified in this study responded differently to SUS. The highest values were observed in SM, and the lowest in SC.

KEY WORDS: Bacteria, fungi, actinomycetes, cellulolytics, ammonifiers.