Potential productivity modelling of Brachiaria brizantha (cultivars Marandu and Xaraés). / Modelagem da produtividade potencial de Brachiaria brizantha (variedades cultivadas Marandu e Xaraés.

AUTOR(ES)

Euro Roberto Detomini

DATA DE PUBLICAÇÃO

2004

RESUMO

With the main goal to purpose a model to estimate the total plant biomass (dry matter) potential productivity (forage removed under cutting management intensive system and optimal conditions) of Brachiaria brizantha, cultivars Marandu and Xaraés, as a function of global solar radiation and air temperature, besides the following goals: (i) acquiring a response curve that might show the shoot and root dried biomass potential productivity regarding to the relative development; (ii) characterizing the dry-matter productivity of leaves, stems and senescing structures of shoots; (iii) identifying the optimal time to pasture cutting; and (iv) characterizing the leaf area index temporal variation; field experiments were carried in Crop Production Department experimental area of Universidade de São Paulo (Piracicaba, SP, Brazil) from November 22nd of 2003 to January 26th of 2004. According to results acquired, it is possible to conclude: (i) the purposed model greatly simulates the total plant biomass (dry matter) potential productivity of Brachiaria brizantha, cultivars Marandu and Xaraés, as a function of year season (from cutting date), climatic variables (daily mean values of global solar radiation and air temperature) and local latitude; (ii) from modeling and field experiments taken together; it is possible to obtain a response-curve reporting the biomass potential productivity of shoot and root compartments as a function of relative development from observed shoot and root dry-matter values, leaf area index (LAI), air temperature and global solar radiation; (iii) the empirical equations greatly denote the productivity temporal variation of leaves, stems and senescing structures dry matter; (iv) the optimal time to both forage utilization (cutting) is around 64% of relative development due to after this moment the shoot dry-matter productivity is strongly affected by increases in stems and senescing structures productivities, otherwise leaf productivity rates decrease as much as relative development raises; and (v) the leaf area index temporal variation of both genotypes might be characterized as a exponential-growth response.

ASSUNTO(S)

pastagem grass xaraés model plant physiology fisiologia vegetal capim marandu brachiaria grass capim – xaraés índice de área foliar marandu grass leaf area index modelo matemático pasture capim brachiaria

Documentos Relacionados

• Glyphosate on the production of wilted silage of Brachiaria brizantha, Stapf. cv. Xaraés.
• Efeito do diferimento sobre a produção de forragem e composição química de Brachiaria brizantha cv. Xaraés.
• Efeito do diferimento sobre a produção de forragem e composição química de Brachiaria brizantha cv. Xaraés.
• Efeito do diferimento sobre a produção de forragem e composição química de Brachiaria brizantha cv. Xaraés.
• Animal perfomance and structural sward on Brachiaria brizantha cvs. Marandu and Xaraés pastures submitted under grazing intensities