Effect of residual fertilizer on green corn yield in rotation with potato crop

This work was carried out at Epamig, Estacao Experimental de Tres Pontas, M G Brazil, to evaluate the residual effect of fertilizer applied in potatoes (Solanum tuberosum L.) field on successive green corn (Zea, mays L.) produ ction. The potato cv. Achat was grown in plots with three treatments: 0, 2 and 4 t ha(-1) of NPK 4-16-8 fertilizer. After potato harvest, hybrid AG-16 2 Agroceres corn was sown in a randomized block experimental design in spli t plots, namely: in the plots, the potato Fertilizer; and in the subplots, the green corn fertilizer, one with, and one without base fertilizer, and f our replications. The following characteristics were evaluated: average len gth of plant, number of ears per plot, ear production, and soil concentrati on of P, K+, Ca2+ and Mg2+. The increase of mineral fertilization to the po tato crop favored a greater nutrients' residual effect, mainly soil exchang eable P, K and Ca, which may increase green corn yield when in rotation wit h potato crop.