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Seasonality of the yield and characteristics of natural rubber of rubber tree clones (Hevea brasiliensis) in different phenological stages The knowledge of the different phases of the basic life cycle of plant species is an effective tool of management and that once identified possible to obtain good yields and better quality to the commercial product. The objective of this work was to evaluate the yield performance and chemical characteristics of the rubber of four rubber tree clones under different tapping systems, phenological stages and edaphoclimatic conditions. The experiment was carried in experimental area of the Departamento de Produção Vegetal da Escola Superior de Agricultura “Luiz de Queiroz”, da ESALQ/USP, Brazil (2242`30``S, 4738`00``W) and in Agência Paulista de Tecnologia dos Agronegócios (APTA) Pólo Regional do Desenvolvimento Tecnológico de Agronegócios do Noroeste Paulista, in Votuporanga city São Paulo State, Brazil (20 ° 20'S, 49 ° 50'W). The experimental design was in randomized block design with split plot and three or four replicates. The main treatments (GT 1, PB 235, IAN 873 and RRIM 600 clones) were allocated in the plots and secondary treatments (tapping systems: 1⁄2S d/2; 1⁄2S d/4 ET 2.5%; 1⁄2 S d/7 ET 2.5%) constituted the subplots. The analyzed variables were: dry rubber yield, ash content, macronutrients and micronutrients of the natural rubber. Samples of natural rubber were obtained in the phenological stages: leaves development, mature leaves and leaves senescence. It was concluded that the yield and chemical characteristics of the rubber are influenced by the edaphoclimatic conditions, by the tapping systems and depending of the phenological stages. The yield and nutrients content of natural rubber is more influenced by the tapping practice than the genetic material in the leaves senescence stage and under restrictive conditions for the plant.

Sazonalidade da produção e características da borracha natural de clones de seringueira (Hevea brasiliensis) em diferentes estádios fenológicos