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Plots Fertilized Every Year

Hay yields from old crested wheatgrass plots fertilized every year with ammonium nitrate (33-0-0) are given in Table 11. This trial was begun in 1955, and 6 years' data are available. In all cases the fertilizer has been applied on these plots in early spring. The treatments include check, 25 pounds, N., 50 pounds N., and 100 pounds N. per acre.

In the 1960 season, all fertilizer applications produced increased forage yields, but as in previous years, the increases obtained with amounts of 50 and 100 pounds of nitrogen were no better than the increase obtained with 25 pounds of nitrogen. The hay yields for all treatments in the 1960 season were: check -- 1279 pounds per acre; 25 pounds N -- 2003; 50 pounds N -- 1954; and 100 pounds N -- 2160 pounds per acre. The 724 pounds of extra hay obtained with 25 pounds of nitrogen is a clearly profitable increase with hay considered to have a value of 1 cent per pound and with the price of nitrogen figured at 10 cents per pound.

The six-year average yields in this trial indicate clearly that there is no advantage to be obtained by annual applications of 50 or 100 pounds of nitrogen per acre over the increased yield obtained from applications of 25 pounds of nitrogen per acre.

For the six years of the trial the average yields of crested wheatgrass hay have been 1144 pounds per acre on the check, 1683 pounds with 25 pounds of nitrogen, and only 1671 and 1783 pounds per acre with 50 and 100 pounds of nitrogen, respectively. There appears to be no justification for using more than 25 pounds of nitrogen per acre applied annually for increased hay production on old crested wheatgrass fields.

Table 11. Forage Production from Old Crested Wheatgrass Plots fertilized annually with Ammonium Nitrate 33-0-3
  Dry weight yield-lbs./acre Percentage increase over check
Year Check 25# N 50# N 100# N 25# N 50# N 100# N
1955 1276 2096 2121 2494 64.3 66.2 95.4
1956 612 751 763 670 22.7 24.7 9.5
1957 1356 2117 2064 2174 56.1 52.2 60.3
1958 1224 1679 1839 1993 37.0 50.2 62.8
1959 1116 1451 1284 1206 30.0 15.1 8.1
1960 1279 2003 1954 2160 56.6 52.6 68.9
6-year Average 1144 1683 1671 1783 47.1 46.1 55.9

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