Comportamento na sombra de acessos de amendoim forrageiro (Arachis spp.), recomendados para região da Baixada Fluminense

Published results are inconsistent regarding the influence of shading on accessions and cultivars of forage peanut. This study seeks to evaluate the influence of four shading levels (0, 25, 50 and 75%) and two cutting intervals (45 and 90 days) on seven plant variables (dry matter production of leaves, stem, roots and whole shoots; leaf/stem ratio; leaf area and specific leaf area) of three forage peanut accessions (BRA 031496 of Arachis pintoi and BRA 031861 and BRA 031801 of Arachis repens) recommended for the Baixada Fluminense region. The experimental design was split-plot randomized blocks with three replicates. The shading levels represented the main plots and the factorial accessions x cutting intervals, the subplots. The software SAEG 9.0 version was used for statistical analysis. Correlations among variables were observed except for root dry matter production. The first rotated factor (F1), which explains most of the observed variance (67.7%), indicated that the highest shading (75%) brought about the greatest dry matter production of leaves, stems and whole shoot and highest leaf area of the BR 031496 and BR 031801 accessions when cut at 90-day intervals. According to these results, the BR 031496 and BR 031801 accessions of forage peanut, recommended for the region, tolerate high levels of shading in either silvipastoral systems or as green-mulch for commercial crops providing that long cutting intervals are adopted.