Continuous usage of cover crops in citrus: influence in seedbank, weeds, and soils chemical characteristics / Uso contínuo de coberturas vegetais em citros: influência no banco de sementes, na comunidade infestante e nas características químicas do solo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In the last few years, the consumers, especially those of the external market, have become more and more interested in food security, namely on what it refers to the means of production. This fact has motivated the search for alternatives of low environmental impact, and one of these is the use cover crops or green manure. In this context the current research aimed the evaluation of the influence of continuous usage of plant cover in citrus orchards over the patterns of infestation and weed seed bank, as well as the soils chemical characteristics. The experiment was carried out in a "Pêra" orange orchard (Citrus sinensis (L.) Osbeck) at the experimental area of Escola Superior de Agricultura "Luiz de Queiroz", University of São Paulo (USP), Piracicaba, SP. The experiment was conducted in random blocks in a 4 x 2 x 2 factorial scheme. The treatment consisted on the combination of four cover crop, two kinds of mowers and two kinds of manure. The cover crops used were lab-lab Dolichos lablab L., Cajanus cajan L. Millsp cv IAPAR 43, Pennisetum glaucum L. Leeke and natural infestation of the orange orchard. Lateral and conventional mowers were used, and the fertilization was made on inter row as well as on the projection of the treescrowns. The following facts were observed from the data that were gathered: the plant cover produced by natural infestation and D.lablab contributed significantly for the reduction of the weedspopulation, and thus having an effect on the seed bank; at the citrus trees rows the dicotyledonous plants had higher relative frequence and relative importance than monocotiledonous plants; the continuous displacement of mulch natural infestation increased pH, organic matter (OM) and magnesium (Mg); the continuous displacement of mulch D.lablab increased phosphorus (P), calcium (Ca) and magnesium (Mg) levels and base saturation (V%). Thus, we can conclude that D.lablab can be a promising alternative as cover crop in citrus cultivation.

ASSUNTO(S)

sementes. soil fertility frutas cítricas cobertura do solo weeds citrus. plantas daninhas fertilidade do solo green manure adubo verde

ACESSO AO ARTIGO

Documentos Relacionados