Row space and sowing density in revegetation with lupin species in degraded soil restoration/Espacamento entre linhas e densidade de semeadura em revegetacao com especie de tremoco visando a recuperacao de solo degradado

• Published in: Ciência rural 2010-09, Vol.40 (9), p.1955
• Main Authors: Rovedder, Ana Paula Moreira, Eltz, Flavio Luiz Foletto, Drescher, Marta Sandra, Dorneles, Fabiana de Oliveira, Schenato, Ricardo Bergamo
• Format: Article
• Language: Spanish
• Subjects: Analysis; Plants (Organisms); Revegetation
• ISSN: 0103-8478

The soil degradation by sandization in the Southwest of Rio Grande do Sul needs to be controlled and, therefore, revegetation is an efficient and low cost technique. The possibility to use a native species from this region for such control measures appears as a viable alternative in economical and ecological terms. The objective of this study was to test the more efficient way to crop Lupinus albescens Hook. & Arn., a native local plant, aiming sandization contention. The experiment was carried out in a degraded area located in Alegrete, RS, Southern Brazil. The treatments were spaced at a distance of 17, 34 and 51cm between rows plantation and number of plants by linear meter (4, 8, 12, 16 and 20 plants in each linear meter). The analyzed parameters were canopy biomass production, macronutrients in canopy biomass, seed production, weight and number of root nodules responsible by biological nitrogen fixation. The analysis of variance analysis was performed and there was no interaction between the factors. The row space produced significant variation for several variables, except for accumulated P in the canopy biomass. The number of plants by linear meter did not interfere on the characteristics analyzed. For the row space, the analysis of variance was complemented by regression analysis and the value for each analyzed characteristic, estimated by mathematical models. The row space of 17cm favored the production and macronutrients accumulation in canopy biomass, besides the weight of FBN nodules. Row space of 51cm was most efficient for seeds production. It was concluded that for crops that aims contention of sandization, row space of 17cm is more efficient, while for crops that aims to produce seeds, row space of 51cm is better. Key words: Lupinus albescens Hook. & Arn, Pampa Bioma, vegetal biomass, biological nitrogen fixation. A degradacao do solo pela arenizacao no sudoeste do Rio Grande do Sul precisa ser controlada e, para isso, a revegetacao e uma tecnica eficiente e de baixo custo. A possibilidade de se utilizar uma especie nativa da regiao para tais medidas de controle surge como uma alternativa viavel do ponto de vista economico e ecologico. O objetivo deste estudo foi testar a melhor maneira de cultivar Lupinus albescens Hook. & Arn., um tremoco nativo da regiao, visando a contencao da arenizacao. O experimento foi conduzido em uma area degradada em Alegrete, Rio Grande do Sul (RS), sul do Brasil. Os tratamentos foram espacamentos com distancia