Abstract
Alfalfa is extremely demanding in fertility, calcium and fertilizer unbalance of soil can lead to loss of alfalfa vigor, causing the development of aggressive weeds. The aim of this study was to evaluate the effect of soil amendment with lime and gypsum and potassium fertilizer on the alfalfa dry matter production, nutritional status and quality and weed occurrence. The results indicated that the practices associated with the lime and gypsum and fertilization with potassium can contribute substantially to the increased longevity of alfalfa. The major responses of alfalfa to potassium fertilization occurred in the highest soil base saturation (V = 80%). A trend of decreasing the occurrence of weeds with the improvement of soil fertility was also observed. The forage nutritional quality was not affected by treatments.
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