Avalia??o do estado nutricional da videira 'Itália' na regi?o de Jales, SP, usando o sistema integrado de diagnose e recomenda??o

摘要

This work aimed to evaluate the nutritional condition of Italia grapevine in the region centered at Jales, SP, Brazil, using the DRIS. The nutritional survey was carried out in twenty vineyards by collecting leaf samples at three different developing phases: at bloom, in fruits between pea and half-berry, and at the begining of fruit maturation. DRIS was shown to be useful for 'Itália' grapevine. Leaf blade was considered the best organ for sampling because its nutritional balance indexes were more adjusted. The blooming and veraison were considered the suitable times for grapevine leaf sampling. Six vineyards were considered nutritionally balanced, with a produtivity above average of 27.3 t/ha. The DRIS allowed the determination of vineyards which usually presented a deficiency of potassium, magnesium, phosphorus, and sulfur and excess of cooper.