Abstract
ABSTRACT The knowledge of the requirements and micronutrients efficiency in banana is relevant to the development of fertilizer recommendations. This study aimed to evaluated requirements and nutritional efficiencies of banana seedlings submitted to omission of micronutrients in nutritive solution. Treatments were complete nutritive solution and solution with individual omission of B, Cu, Fe, Mn and Zn, and two Prata-Anã and BRS Platina hybrid genotypes. Leaf area, dry matter of leaves, rhizome, roots and total and micronutrient contents were determined. With results, the following indexes were calculated: uptake, transport and micronutrient utilization efficiency. B deficiency effected more intensely the growth of both banana genotypes. The nutrient uptake corresponded to the following sequence: Fe > Mn > Zn > B > Cu, which reflects the plant requirements. The BRS Platina hybrid showed higher B, Fe and Zn absorption efficiency in relation to Prata Anã cultivar, which had higher Cu absorption efficiency. BRS Platina hybrid showed higher efficiency in the transport of Fe and Mn, while Prata Anã only for Cu. Prata Anã cultivar showed higher micronutrient utilization efficiency in complete treatment and treatment with omission of micronutrients.
Highlights
Banana (Musa spp) is among the most commercially exploited fruits, being one of the fruits most consumed worldwide
This study aimed to evaluate the requirements and nutritional efficiency of banana seedlings Prata Anã and BRS Platina hybrid cultivars submitted to the omission of micronutrients in the nutrient solution
Banana seedlings Prata Anã and BRS Platina hybrid cultivars cultured in complete solution grew normally showing no visual symptoms of deficiency, indicating that the nutrient solution and pH used were appropriate for the growth of plants
Summary
Banana (Musa spp) is among the most commercially exploited fruits, being one of the fruits most consumed worldwide. The growth and development of banana are affected by several factors, among them nutrition, which is decisive for plants to reach high yields, since they have rapid growth and accumulate large amounts of nutrients (Hoffmann et al, 2010; Rodrigues et al, 2010). The alternative to assess the nutritional requirements of crops is through the subtraction diagnostic technique. This technique involves growing plants under field or greenhouse conditions hydroponically, in which a complete treatment is tested (with all necessary nutrients in appropriate doses) and a number of treatments, in which the omission of each nutrient is made separately. Studies in field conditions do not allow to accurately assess the nutrient use efficiency on the physiology and growth of plants
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