High quality forest seedlings are essential for the implementation of a commercial forest system, and it is therefore necessary to study their development in different environments, seeking to identify the most favorable environment for their production. In view of the above, the purpose of this essay was to evaluate the production of quamwood seedlings in different environments and workbenches with reflective material. The study was conducted at the State University of Mato Grosso do Sul-Cassilândia-MS from August to November 2017, in a completely randomized design within each environment and the environments compared by the joint analysis of the data. At the opportunity, produced quamwood seedlings under shade levels of 0% (full sun), 30% under sombrite, 35% under thermo-reflective screen and the agricultural greenhouse with thermo-reflective screen under the film with 42/50% shading. In the interior of each environment the seedlings were placed on cultivation benches with reflective material (aluminum paper) and without reflective material. The environments were compared by the joint analysis, and the results of molt height and lap diameter were measured at 30, 55 and 72 days after transplanting. The experiment was completed at 72 days after transplanting and the destructive analysis of the seedlings was performed, subjecting them to drying in a forced ventilation oven until reaching a constant dry mass. Based on the results obtained, the total dry mass, height and diameter ratio, root dry mass ratio and dry mass root system, absolute growth rate and Dickson quality index were calculated. The protected environments were favorable to the formation of paricá seedlings. The environment in full sun formed small, but more rustic seedlings. The use of reflective material had a positive effect only in the plastic coverage environment with 42/50% shading screen.

Este trabalho teve por objetivo avaliar a qualidade inicial das sementes de melancia submetidas aos testes de envelhecimento acelerado tradicional e alternativo. Foram empregados dois procedimentos para o envelhecimento acelerado: tradicional (40 ml de água destilada) e método alternativo [solução saturada de NaCl (40 g do sal/100 mL de água)], sob temperatura de 42 ºC durante 24, 48, 72, e 96 horas. O delineamento utilizado foi inteiramente casualizado, em esquema fatorial (2x4) com quatro repetições. Ao término de cada período, as sementes foram submetidas ao teste de germinação e a avaliação da porcentagem de plântulas normais foi realizada aos cinco dias após a semeadura. Os dados da contagem de germinação foram submetidos à análise de variância e as médias foram comparadas pelo teste de Tukey (P<0,05). O teste de envelhecimento acelerado tradicional no período de 24 horas obteve maiores médias de germinação (80%); não houve diferença significativa na porcentagem de sementes germinadas no tratamento alternativo, independente do período de envelhecimento. Observa-se que o uso da solução tradicional é mais eficiente para avaliar o vigor em sementes de melancia.