. Efficient use of annual plants on cattle ranges in the California foothills . F-460560 Figure 3.—Cage made of 2-inch mesh poult^ netting used to protect vegetation from grazing by cattle. herbage was measured on another set of quadrats each fall during a 7-year period, 1936-42. This J^-acre area was located within pasture 1. To facilitate comparison of yields between experimental range units with different amounts of waste area, yields were measured only on productive, grazable land. Rocks, brush, and other waste areas were excluded from the samples. Then the amount of waste area was measure
. Efficient use of annual plants on cattle ranges in the California foothills . F-460560 Figure 3.—Cage made of 2-inch mesh poult^ netting used to protect vegetation from grazing by cattle. herbage was measured on another set of quadrats each fall during a 7-year period, 1936-42. This J^-acre area was located within pasture 1. To facilitate comparison of yields between experimental range units with different amounts of waste area, yields were measured only on productive, grazable land. Rocks, brush, and other waste areas were excluded from the samples. Then the amount of waste area was measured in 1942 on 16 transects across each of the six grazing-intensity pastures and subtracted from the total area to determine the grazable acreage. In evaluating the productivity and grazing capacity of different kinds of land, a range site classification was employed. The development of this classification entailed the making, in 1945, of a site-class map of the six grazing-intensity pastures. Measurements were also made to determine the seasonal pattern of plant growth. During the 1937-45 period, plant density and height were measured at one fixed station in each of the six pastures at intervals of 1 to 4 weeks. The average growth and development of vegetation by sites were determined in each year by observations of plant growth over all of the experimental pastures and by color photographs at selected stations. Detailed observations were made on critical features of plant growth, such as the amount of precipitation required to germinate the seed and start growth of the several species, growth on south slopes contrasted with growth on north slopes, growth at different air tempera- tures, and the relative dates of flowering, fruiting, and drying of the different species on different sites. Many comparisons of plant heights were made across fence lines between experimental pastures grazed at different degrees and between spots grazed to different degrees within pastures.
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Keywords: ., bookcentury1900, bookpublisherwashingtondcusdeptofagriculture
