Resposta da alface em sistema agroflorestal irrigado por gotejamento.

Resumo: Os sistemas agroflorestais (SAFs) proporcionam comumente uma otimização da área de cultivo, mão-de-obra, insumos e água, com maior estabilidade e diversificação da produção, maior eficiência no controle de plantas espontâneas e proteção do solo contra a erosão. Contudo, atualmente são escassos os estudos sobre SAFs irrigados. Desta forma, este trabalho teve como objetivo avaliar a produção da cultura da alface (Lactuca sativa L.) em cultivo solteiro e consorciado com rúcula (Eruca sativa L.) e rabanete (Raphanus sativus L.), no interior de um SAF e a pleno sol, sob irrigação por gotejamento. O estudo foi conduzido no Sítio Agroecológico da Embrapa Meio Ambiente, em Jaguariúna, SP. Os resultados demonstraram que o sistema de condução não influenciou o diâmetro horizontal da alface, enquanto o cultivo a pleno sol promoveu maior produção de massa seca e número de folhas de alface e rúcula. O rabanete apresentou folhas mais longas no SAF quando comparado ao pleno sol. O policultivo aumentou a produção por unidade de área, em 129,5% em média, em relação ao monocultivo no SAF e pleno sol. Estes resultados demonstraram que a consorciação foi vantajosa em relação ao monocultivo, ao produzir uma maior quantidade de hortaliças por unidade de área e insumos

SHADING LEVELS AND PLANT GROWTH REGULATOR FOR FORMATION OF SCHIZOLOBIUM AMAZONICUM COMPACT SEEDLINGS

ABSTRACT Paricá (Schizolobium amazonicum) can be used for rehabilitation of degraded lands, timber manufacturing markets. However, for its planting, high-quality seedlings should be used. Thus, this study aimed to evaluate the effect of different types of paclobutrazol (PBZ) application and two shading levels on high-quality seedling production. As there was no replication of cultivation environments, we considered each one of them as an experiment. For each environment (35 and 50% shading screen), a completely randomized design was adopted, testing combinations of two types of PBZ application (direct seed immersion in 0.005% PBZ solution; substrate hydration with 0.005% PBZ solution; and 50% seed hydration and 50% substrate hydration; plus, a control), with five replications and five seedlings per plot. The environments were evaluated by analysis of groups of experiments. Seedling growth was evaluated. Under 50% shading, Paricá seedlings had better growth conditions. Application of 100% PBZ in substrate provided compact seedlings with larger dry root phytomass, besides being more practical.</div

Dipterocarps protected by Jering local wisdom in Jering Menduyung Nature Recreational Park, Bangka Island, Indonesia

Apart of the oil palm plantation expansion, the Jering Menduyung Nature Recreational Park has relatively diverse plants. The 3,538 ha park is located at the north west of Bangka Island, Indonesia. The minimum species-area curve was 0.82 ha which is just below Dalil conservation forest that is 1.2 ha, but it is much higher than measurements of several secondary forests in the Island that are 0.2 ha. The plot is inhabited by more than 50 plant species. Of 22 tree species, there are 40 individual poles with the average diameter of 15.3 cm, and 64 individual trees with the average diameter of 48.9 cm. The density of Dipterocarpus grandiflorus (Blanco) Blanco or kruing, is 20.7 individual/ha with the diameter ranges of 12.1 – 212.7 cm or with the average diameter of 69.0 cm. The relatively intact park is supported by the local wisdom of Jering tribe, one of indigenous tribes in the island. People has regulated in cutting trees especially in the cape. The conservation agency designates the park as one of the kruing propagules sources in the province. The growing oil palm plantation and the less adoption of local wisdom among the youth is a challenge to forest conservation in the province where tin mining activities have been the economic driver for decades. More socialization from the conservation agency and the involvement of university students in raising environmental awareness is important to be done