Fontes de fósforo associadas à bactérias benéficas sobre o crescimento inicial e nutrição fosfatada do milho.

Abstract

The use of bacteria growth promoters of plants (BPCP) associated with application of doses of phosphorus, has provided high rates of production, Brazil, for the culture of corn (Zea Mays). However for achieve adequate productivity, it is usually necessary know the best dose of phosphorus, which is a of the factors what else contribute with the costs of production. In the present work, the objective was to evaluate the influence of sources of P associated or not to bacteria growth promoters of plants (BPCP) about nutrition in early growth and phytomass production. Work was driven at home vegetation from the Federal University of Campina Grande (UFCG), Campus Pombal-PB. Was used horizon sample B on one chromic luvisol, collected in the municipality São Domingos-PB. Were tested six treatments (T), beyond control (C), constituted by constituted by single superphosphate (SFS), reactive natural phosphate (FN) e BPCP specified like this: T1: control (without P), T2: 200 mgdm-3 P as SFS, T3: 200 mg dm-3 P as SFS + BPCP, T4: 200 mg dm-3 P como FN, T5: 200 mg dm-3 P como FN+BPCP, T6: 100 mg dm-3P as SFS it is T7: 100 mg dm-3P as SFS+BPCP. Was used the delineation entirely randomized with four repetitions, and two plants per plot. As parameters for evaluation the effectiveness of treatments at 45 days after emergence, were evaluated to plant height, stem diameter, dry mass of roots, stems, leaves and total, as well as the levels of P in these tissues, in addition to the phosphorus available from the extractor Mehilic-1 and P-soluble. The treatments with simple superphosphate (SFS), associated or not with (BPCP), raised the levels of P in the dry mass of corn and promoted an increase increase in production of dry mass and accumulation of P.