Resumo

RENGEL, Marcos; GIL, Fernando  e  MONTANO, José. Growth and dynamics of nutrient accumulation in sugarcane: I. Micronutrients. Bioagro [online]. 2011, vol.23, n.2, pp.135-140. ISSN 1316-3361.

With the purpose of determining the dynamics of micronutrient accumulation and partitioning of sugarcane var. RB 85-5035, a trial was conducted in Fundacaña, located in Chivacoa, Yaracuy State, Venezuela. Ten samples of the aerial part of the plant were taken through the growing season, and each sample consisted of three stumps, taken at random on a monthly basis in an area of 0.6 m²·cepa^-1. Concentrations of Fe, Cu, Zn, Mn, B and Mo on stems and leaves were analyzed by Land Crop Laboratories in York, England. It was determined that the critical periods for micronutrient absorption are found in the vegetative phase and crop ripening. The micronutrients Fe, Mn, B and Mo were stored in greater amounts in the leaf tissue of the plant, while  Cu  and  Zn  accumulated  more  pronounced  in  the  stems  during  the  cycle. The accumulation patterns showed that the crop micronutrient requirements were: Fe=5241.5 g·ha^-1, Cu=121.1 g·ha^-1, Zn=875.6 g·ha^-1, Mn=1142.4 g·ha^-1, B=116.4 g·ha^-1 and Mo=33.4 g·ha^-1.

Palavras-chave : Plant nutrition; iron; manganese; zinc; copper; boron; molybdenum; Saccharum spp hybrid.