Altura de decepa para estabelecimento de minijardim clonal de Nim (Azadirachta indica A. Juss).

Abstract

Azadirachta indica A. Juss, popularly known as Nim, is a species native to India. In the Brazilian semi-arid this species has been used in large scale in the urban arborization, besides being used to produce insecticides, cosmetics and products used in veterinary and human medicine. The production of seedlings of Azadirachta indica by the seminal route becomes limited, because the seeds of this species lose their germinative power in short period of time and their storage is difficult. One solution to this problem is minicutting technique, which is a technique of vegetative propagation, which consists in using sprouts of plants that have already been propagated by the macro-stem or plants of seminal origin as sources of vegetative propagules. The objective of this work was to evaluate ministumps of Azadirachta indica A. Juss (Nim), of seminal origin submitted to different cutting heights and rooting of minicuttings of different sizes originated from these ministumps. The research was carried out in the UFCG Forest Nursery of the Patos campus, starting with the establishment of a clonal minigarden formed with the cutting of seedlings in three heights (10 cm, 25 cm and 40 cm), totalizing 39 minicepas. The ministumps were arranged in a completely randomized design (DIC) where each plot consisted of a minicep. The analyzed variables were minicep survival, collection diameter and minicut production. From the minicuttings produced by the ministumps, a second experiment was used, using propagules with sizes of 5 cm, 8 cm and 11 cm, in which the percentage of rooting, height, diameter, RAD, Dry Mass (MSR), MSR / MSPA ratio, and Dickson Quality Index (IQD) were used. Azadirachta indica A. Juss ministumps indicate 100% survival. The mean number of minicuttings / ministumps / collected with 40 cm was lower than the other treatments (P < 0.05). There were no differences between the size of the propagules (5 cm, 8 cm and 11 cm) in relation to the rooting percentage (P> 0.05). The seedlings, at 90 days after planting of the minicuttings, originated from the larger propagules (11 cm) and presented a better balance between the accumulated reserves in the root and shoot (MSR / MSPA) And also higher IQD.