EFFICIENCY OF SIMPLE SUPER PHOSPHATE IN THE VETIVER GRASS DEVELOPMENT SUBJECTED TO SOIL BIOENGINEERING
2015
Araújo Filho, Renisson Neponuceno de | Holanda, Francisco Sandro Rodrigues | Santana, Ighor Diaquino Matias | Santos, Tiago de Oliveira | Primo, Dário Costa
Portuguese. The development of vetiver grass (Chrysopogon zizanioides L.) has been evaluated under different levels of phosphorus on slopes of the right-side bank of the San Francisco River, in the municipality of Amparo do São Francisco, SE. Techniques of soil bioengineering were used, characterized by the combination of vegetated riprap with stakes, seedlings of vetiver grass and sediment retainers. The experimental design was randomized blocks with five doses (0, 4, 8, 12, and 16 g pit-1 of simple superphosphate) and five replicates. The growth of vetiver seedlings were observed in periods of 30, 60, 90, e 180 days, carrying out the following parameters: number of roots, external root surface, root density, root length, root length density, root and shoot dry weight, root and shoot fresh weight, and shoot length, at each evaluation period. The phosphorus doses and periods of morphological development interacted in all variables of plant biomass mentioned above. Higher superphosphate doses than 9.0 g pit-1 did not offer advantages in terms of cost-benefit for the production of vetiver seedings.
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