Emergência e vigor de ipê roxo e jacarandá mimoso em diferentes substratos sob ambiente protegido

Abstract

Reforestation and urban afforestation is a current demand in our society, therefore the seedling production becomes a challenge, as quality seedlings are a determining factor for change to become a tree. The present study had the objective of evaluate the germination and characterizing seedlings of Handroanthus impetiginosus (Mart. ex DC.) Mattos and Jacaranda mimosifolia D. Don. under different substrates in a protected environment. In the experiment it was used that the block design casualized with subdivided portions. The substrates used were: carolina soil, vermiculite,vegetable land and arisco + compost 2:1 v/v. They were evaluated: seedling height, stem diameter, root length, percentage of emergency, mean emergency time and emergency speed index. The results indicated that the arisk substrate + organic compound favored greater height of ipê-roxo seedlings, while vermiculite showed the best results for the mimosa rosewood. The diameter of the larger stem in ipê-roxo was with the substrate vermiculite, while for mimosa rosewood there was no significant difference between the substrates. Root length was greater in the soil substrate for both species. Vermiculite provided a higher emergence rate for ipê-roxo and vegetable land for mimosa rosewood. The mean emergency time was shorter in vermiculite for ipê-roxo and in the vegetable land for the mimosa jacaranda. The emergency speed index was greater in vermiculite for ipê-roxo and vegetable land for mimosa rosewood. It is concluded that the substrate has a direct influence on the initial development of scientific species changes, with vermiculite and vegetable land standing out as the most adequate substrates for germination and initial growth of seedlings.