Biometric parameters of mycorrhizal in seedlings of Mimosa caesalpiniifolia under phosphorus levels in Latossolo Amarelo

Abstract

This work aimed to study the influence of inoculation of arbuscular mycorrhizal fungi (AMF) Claroideoglomus etunicatum and levels of phosphorus in subsurface substrate of a Latossolo Amarelo biometric parameters in seedlings of Mimosa caesalpiniifolia Benth. The experiment was conducted in a greenhouse, in Bom Jesus in Piauí State, Brazil, October, 2011 to December, 2011. The experimental design was completely randomized in 4x3 factorial scheme, with the factors: phosphorus levels (0, 60, 120 and 240 mg dm-3) and mycorrhizal treatments (no AMF, C. etunicatum and natives AMF). At 65 days after sowing, it was evaluated the biometric parameters plant height, stem diameter, number of leaves, dry weight of roots and shoots, root length, root diameter, root volume, mycorrhizal colonization and mycorrhizal efficiency. Inoculation with C. etunicatum increases seedling growth of M. caesalpiniifolia in substrate subsurface of Latossolo Amarelo under low phosphorus levels. The maximum efficiency occurs in the absence of mycorrhizal phosphate fertilizer. With the increasing levels of phosphorus occurs further growth of Mimosa caesalpiniifolia seedlings and decay in the rate of root colonization by AMF, C. etunicatum and AMF natives.