Abstract
The objective of this study was to evaluate the effects of poultry litter and Organosuper ® with three modes of application on the biomass production and nutrient content of the leaves of roselle plants. The treatments in each crop cycle were in a factorial arrangement, 2 x 3 + 1, composed of a control and combinations of the two organic fertilizers (poultry litter (10 ton. ha -1 ) and Organosuper ® (10 ton. ha -1 ) and the three application modes (surface, incorporated and surface + incorporated), in a randomized block design with four replicates. In the surface + incorporated mode, the organic fertilizers were applied as 5 ton. ha -1 surface and 5 ton. ha -1 incorporated. The highest productions of fresh and dry weight and number of calyxes were obtained for poultry litter in surface (10,776, 1,239 and 3,980,602 kg ha -1 , respectively) and Organosuper ® incorporated (11,372, 1,308 and 4,405,075 kg ha -1 , respectively) in the agricultural year 2009/2010. The increases in the fresh and dry weights of the calyxes, leaves, stems and roots, number of calyxes, leaf area and fibers in the agricultural year 2008/2009 in the poultry litter treatments. Nutrients concentrations in the dry weight of the roselle leaves were not affected by the organic fertilizer type or by the mode of application.
Highlights
The roselle plant (Hibiscus sabdariffa L., Malvaceae) is originally from India, Sudan and Malaysia and has been introduced to eastern Africa and Central America
At the Medicinal Plant Nursery (MPN) of the Federal University of Grande Dourados (UFGD) in Dourados, Mato Grosso do Sul State, two experiments were performed with roselle: one in the agricultural year of 2008/2009 and another in
The conjoint variance analysis of the experiments showed that there was a significant interaction between treatment and years for the fresh and dry weight of the leaves, stems, roots and calyxes, the number of calyxes, the leaf area and the fiber; individual analyses were performed for these experimental variables
Summary
The roselle plant (Hibiscus sabdariffa L., Malvaceae) is originally from India, Sudan and Malaysia and has been introduced to eastern Africa and Central America. In Brazil, it has adapted to several regions and can be found in residential gardens. Its leaves and fruits are widely used for human and animal food, and the stems are a source of fiber for the textile and paper industries. The roselle plant is an important source of the vitamins A, B and C, iron, phosphorus and protein; it can be. Agronomy used as are placement for animal protein. Its calyx is used in jelly, paste, sweets, syrup and wine preparation; its manufacturing residues can produce high quality vinegar (CHANG et al, 2003; FAGBENRO, 2005; MUKHTAR, 2007; OTTAI et al, 2006)
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