| Summary: | A two-year yield experiment is described in which proof is presented of responses to major-element fertilization of Imperial Grass (Axonopus scoparius). Each of the major elements gave significant increase in yields, but by far the most efficient combination was that of nitrogen and potassium, with yields as high as 44 metric tons per hectare The largest interaction was that of nitrogen and potassium, the effect of phosphorus was relatively minor. Additional increases in yield were obtained with cow manure and phosphorus but not with lime. In fact, the evidence points to a damage to the stand of Imperial grass when lime was added, even though the correction of the original acid pH of 47 was only made to levels of 5 2. The effect of all fertilization was practically gone 14 months after the last application. The effect of potassium was nevertheless more persistent than that of nitrogen or phosphorus
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