<b>Mycorrhizal efficiency in seedlings production of <em>jacarandá-da-bahia</em> cropped at different phosphorus levels</b> - DOI: 10.4025/actasciagron.v27i4.1303

Abstract

The aim of this work, carried out in greenhouse, was to study the phosphorus utilization efficiency and the root efficiency of jacaranda-dabahia (Dalbergia nigra (Vell.) Fr. Allem.) seedlings from data of phosphorus content obtained on shoot and on root system, evaluating the effects of soil fertilization with phosphorus (P) and arbuscular mycorrhizal (AM) fungi. Seedlings were grown on a substratum composed by soil, sand and vermiculite, at the rate of 1:1:1. The treatments consisted in five P doses (0, 50, 100, 150 and 200 mg dm^-3), applied as a soluble source, on absence and presence of the AM fungi, Gigaspora margarita and Glomus fasciculatum. Evaluations were carried out at 45, 90 and 135 days after inoculation. Results showed that independent of added phosphorus doses, the jacaranda-da-bahia seedlings inoculated with AM fungi, G. margarita and G. fasciculatum, when compared with the non-inoculated seedlings, exhibited higher dry matter weight, P content and P utilization efficiency on the shoot and in the root system as well as higher root efficiency, that is to say, higher capacity of the root system to uptake P and to transfer it to the soot.