Resumo

VELAZQUEZ DUARTE, José Augusto et al. Effect of different doses of bovine manure on Stevia rebaudiana (Bertoni) Bertoni organic crop under drip irrigation system. Investig. Agrar. [online]. 2016, vol.18, n.2, pp.101-110. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2016.diciembre.101-110.

Stevia production is economically important for diversification of family farms. The aim of this research was the assessment of the effect of different bovine manure doses (0, 20, 40, 60, 80 and 100 t ha-1) on stevia grown under irrigation. The experimental design was randomized block with three replicates and eighteen experimental units. Leaf Dry Mass (LDM), Stems Dry Mass (SDM) and Total Dry Mass (TDM) per plant were determined as well as assimilate distribution in LDM, SDM and SDM yield per hectare. Results showed that with 60 t ha-1 of bovine manure was obtained the highest LDM per plant in the first cut, the second cut and a total with 24.90; 29.39 and 54.30 g pl-1 respectively. On stems, 8.96; 12.01 and 20.97 g pl-1of SDM were recorded. It was also established that yield is influenced by doses of bovine manure with 2760.83; 2521.66 and 5282.50 kg ha-1 of LDM, SDM and TDM in the first cut, the second cut and the total, respectively, being the 60 t ha-1 of bovine manure the dose with the best result. It was not detected any influence of manure dose on assimilate distribution in the first cutting 73.88% for leaves and 26.10% for stems. On the second cut, a significant effect was verified when applying 100.0 t ha-1of bovine manure and with an average of 78.32%, allocating the highest quantity of DM to leaves. This information is useful to recommend doses of bovine manure for stevia production.

Palavras-chave : Stevia rebaudiana; production; organic fertilization; dry matter; assimilated..

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