Tecnologia de produção de mudas de cariniana micrantha ducke

Abstract

Information about the production of seedlings of forest species is scarce, and quality seedlings are important for a good planting establishment without loss of financial resources. For this, it is necessary to establish techniques for the production of healthy seedlings at a lower cost. Thus, the present study aimed to evaluate the production of Cariniana micrantha seedlings in different containers, substrates and production environments. The experiment was carried out in the forest nursery of the Centro de Estudos Superiores de Itacoatiara/AM. Polyethylene plastic bags of 0.5, 1.3 and 2.8 liters and tubes with volumes of 55, 180 and 290 ml were tested as production containers. The seedlings produced in the larger volume containers obtained negative results for all the studied variables, while the smaller volume containers presented better results for the development of the seedlings. For the evaluation of substrates, two types were tested, organic and mineral based, both received fertilization, one with slow-release fertilizer and the other with soluble fertilizers, respectively. There was no significant difference between the two substrates for the variables: seedling survival, stem diameter, height growth, total dry biomass and aerial biomass. There was only significant difference in relation to root biomass, the organic substrate provided the best root development. Regarding acclimatization, the seedlings were placed in a shady and full sun environment, the seedlings that remained in the shade showed no variation in the values of maximum quantum efficiency of photosystem II, only the seedlings in full sun showed low values, reaching 0 ,4, but with recovery between the 10th and 11th day. Thus, it is possible to observe that C. micrantha seedlings have the potential for acclimatization, but with a period longer than 11 days.