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It has often been observed on winter range in California that annual grasses appear to respond more to nitrogen fertilizer than do perennial grasses when grown together. In a Lake County grazing test with sheep (Martin and Berry 1958), an annual grass plus Hardinggrass mixture produced little more meat when fertilized with nitrogen than did a straight annual grass pasture similarly fertilized. It was felt that the bulk of the stimulation which about doubled days of grazing and meat production came from increased growth of annual grasses. Similarly at the Massey Experimental Range in San Diego County (Kay, Walker, Street and Myler 1958) hand separations of April clippings of fertilized and unfertilized areas showed very great response from nitrogenphosphorus fertilizers in the annual grass fraction with only slight and not statistically significant increases in the perennial grasses. In 1961 a field observation was made at the Eagle Ranch in San Luis Obispo County that may be of interest. In fertilizing a hay field composed of Hardinggrass (Phalaris tuberosa, var. stenoptera) and annual grass a single strip of about 600 pounds of ammonium sulfate was applied around the field. Next to it was an unfertilized strip, while the balance of the field was fertilized with approximately 300 pounds of ammonium sulfate per acre. It appeared that most of the response in the lightly fertilized section of the field was by the annual grasses while in the high nitrogen strip Hardinggrass was greatly stimulated. Quadrats were cut at three positions in each strip and separations made into annual and perennial grasses. The samples were then dried and yields of each fraction calculated. The results are shown in Table 1. Reported yields are averages from three quadrats in each strip.

Differential Nitrogen Response of Annual and Perennial Grasses