Crecimiento e indicadores morfológicos de posturas de Enterolobium contortisiliquum y Leucaena leucocephala producidas en diferentes substratos

Abstract

The objective was to evaluate substrates containing sewage sludge and cow dung in the production of tree leguminous stands. The treatments were constituted by different proportions of clay soil, sandy soil, cow dung and mud associated with the application of mineral fertilizers (Superphosphate simple and KCl), in addition to a treatment with commercial substrate Bioplant as a control. Each of the species ( Enterolobium contortisiliquum and Leucaena leucocephala) constituted independent experiments using a randomized block design with 3 and 4 replicates, respectively. In both species, the emergency speed index (EVI) was determined. In E. contortisiliquum, physiological and morphological measurements were made at the time of transplantation, while in L. leucocephala, from 100 days after planting, the morphological indicators of plant height and stem diameter were evaluated and the index robustness of the posture was calculated. The IVE only showed differences (P = 0.0017) between the substrates in the species L. leucocephala with the highest value (3.73) in the treatment with the ratio 3: 1: 0: 1 + SS + KCL that did not differ from the control (3.25). In E. contortisiliquum this index varied between 6.32 and 7.42 with P = 0.5912. The physiological and morphological indicators in E. contortisiliquum were not influenced by the substrates showing similar values ​​to the control. The height of the plant and the stem diameter in L. leucocephala had values ​​between 7.47 and 9.44 cm and 2.46 and 3.52 mm at the end of the experimental period. The average growth rate of these indicators and the robustness index of the positions were similar in all treatments. We conclude the possibility of using sewer sludge and bovine manure for the production of E. contortisiliquum postures and studies are recommended that stimulate the growth rates of L. leucocephala postures.