Abstract:RESUMO -O presente trabalho objetivou avaliar a alocação de biomassa em plantas de Brachiaria subquadripara em função de diferentes concentrações de N, P e K em solução nutritiva. O delineamento experimental utilizado foi inteiramente casualizado, com seis repetições, e os tratamentos constituíram-se de cinco níveis de N, P e K (0, 25, 50, 75 e 100% da concentração na solução-base) durante cinco épocas (intervalos de sete dias). A solução-base utilizada refere-se à diluição de 20% da solução nutritiva para cul… Show more
“…In the Barra Bonita hydroelectric power plant reservoir, Domingos et al (2011) reported to have found nitrogen (N total), phosphorus (PO 4 3-), and potassium (K) concentrations in the water of 55,2; 77,5, and 17.2 mg L -1 , respectively. In the present study, the initial growth of B. subquadripara plants increased in agreement with the increasing concentrations of N, P, and K in the nutrients solution.…”
Section: Resultsmentioning
confidence: 99%
“…These characteristics are thought to be responsible for B. subquadripara being capable of suppressing other competitors (Thomaz & Bini, 1998;Domingos et al, 2011).…”
A B S T R A C TThe objective of this study was to evaluate the initial growth of emergent plants of Brachiaria subquadripara under different conditions of availability levels of the nutrients nitrogen (N), phosphorus (P), and potassium (
“…In the Barra Bonita hydroelectric power plant reservoir, Domingos et al (2011) reported to have found nitrogen (N total), phosphorus (PO 4 3-), and potassium (K) concentrations in the water of 55,2; 77,5, and 17.2 mg L -1 , respectively. In the present study, the initial growth of B. subquadripara plants increased in agreement with the increasing concentrations of N, P, and K in the nutrients solution.…”
Section: Resultsmentioning
confidence: 99%
“…These characteristics are thought to be responsible for B. subquadripara being capable of suppressing other competitors (Thomaz & Bini, 1998;Domingos et al, 2011).…”
A B S T R A C TThe objective of this study was to evaluate the initial growth of emergent plants of Brachiaria subquadripara under different conditions of availability levels of the nutrients nitrogen (N), phosphorus (P), and potassium (
“…O balanço de acúmulo de massa seca em folhas e em colmos pode indicar se a competição e o sombreamento aos quais a planta está submetida são aceitáveis, ou não, para a espécie em avaliação (Domingos et al, 2011). Aspiazú et al, (2008) observaram que plantas de capimarroz (Echinochloa crusgalli) acumularam mais massa em colmos que em folhas quando sob alta intensidade de competição, como forma de sobrepassar as plantas do competidor e formar o seu dossel acima das demais plantas.…”
RESUMOCrambe (Crambe abyssinica) has a cropping cycle of around 90 days, being suitable as an alternative to the second grain crop planted after soybean is harvested in the Center West region of Brazil. It is necessary to understand the growth and development dynamics of crambe plants in order to allow correct management of the production factors. This study aimed to describe the growth and development parameters of crambe plants under presence or absence of interspecific competition. The experiment was installed in the fall-winter 2011 in an Oxisoil, in completely randomized blocks design with three replications. Treatments comprised crambe plants growing either in presence or absence of interspecific simulated competition, throughout the cropping cycle. Plants were collected for the growth analysis every 15 days from harvest until 75 days after emergence. Growth parameters leaf area (AF), dry mass of stems/culms (MSC), leaves (MSF) and total (MST) dry mass, leaf area index (IAF), absolute (TCA) and relative (TCR) growth rates, net assimilation rate (TAL), specific leaf area (AFE), leaf area duration (DAF), leaf area ratio (RAF) and leaf mass ratio (RMF) were determined for the crop plants, subjected or not to competition, as well as for the simulated competitor. Crambe is a low competitive crop, being the competition more severe until 60-70 days after emergence. Besides, crop performance under field conditions was properly described by the net assimilation rate (TAL), which is also affected by the leaf area duration (DAF) and leaf mass ratio (RMF).
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