Alagamento e sombreamento no desenvolvimento de mudas de baru (Dipteryx alata vog.)

Abstract

Baru (Dipteryx alata Vog.) is a plant from the cerrado with high potential for exploitation. It has a fruit whose pulp and chestnut are appreciated for consumption, in addition to several medicinal properties. The use generates income for countless people, therefore studies on its development are necessary to conduct the best management. Aiming to fill in the gaps and insufficient information of this species regarding light requirements and flooding tolerance, this study evaluates the development and quality of baru seedlings under different shading levels and water regimes. The seedlings were submitted to three shading levels: full sun, 30%, and 70%, and to two water regimes – flooded and non-flooded (control). The less negative water potential (Ѱw) was observed in shading 0 (full sun) and in shading 70% at 20 days. The CI showed better results in the shading of 30 and 70%. The shoot length (CPA) was longer in the 70% shading. For root length (CR), the best results obtained were in full sun and 30% shading. Positive results were obtained in the aerial part fresh mass (MFPA) in all light regimes, with the exception of the 30% flooded shading. For fresh root mass (MFR) the best results were obtained in the flooded control treatment and 30% non-flooded shading, at 20 days. Positive results were found for shoot dry mass (MSPA) in most shading and water regimes, except for the 30% flooded shading and the 70% control shading at 20 days. For root dry mass (RSM) the plants showed better results in shading 0 (full sun) and in 30% shading control, at 20 days. The root/shoot ratio (RPA) obtained the best result at 20 days, in shading 0 (full sun) and in shading of 30%. The height/diameter ratio (RAD) was higher in the 70% shading. Given the above, it is concluded that baru seedlings develop better in 30% shading and, despite tolerating flooding for 20 days, the stressful factor negatively affects the quality of the seedlings.