APPLICATION OF IRON CHELATES TO GRAPEVINE LEAVES (VITIS-VINIFERA CV ALEDO) - RESIDUAL EFFECT ON FE, ZN AND MN MICRONUTRIENTS

For two consecutive years, a plot of vine (Vitis vinifera) cv. Aledo, has received several additions of Fe chelates through leaves and/or so il, with satisfactory results on the correction of some deficiences. D ifferent behaviour was ... depending on the product utilized, with Fe- EDTA showing the best results. In the present work, we have studied th e residual effect of these chelate additions after one year without ch elate fertilization. Generally, homogeneous behaviour was observed, al though occasionally, some differences appeared which however were caus ed by the additions made in previous years; a consequence the residual effect can be ignored.