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Plots Fertilized Every Other Year

The hay yields from the plots fertilized every other year with ammonium nitrate are given in Table 12. These plots are fertilized in the spring, and the rates of application are the same as for the plots fertilized annually. Fertilizer applications were made in the spring of 1957 and 1959. The data obtained thus far in this study indicate that there is some carry-over from all rates of fertilization. The effect was particularly pronounced in the 1960 season when yields on the plots fertilized in 1959 showed 1306 pounds per acre for the check, 1813 pounds per acre for 25 pounds of N., 1801 pounds for 50 pounds of N., and 2187 pounds of hay on the plots receiving 100 pounds of N.

On the basis of the use of equal amounts of nitrogen over a 2-year period, the increases in yield obtained from fertilizing every other year with 50 pounds of nitrogen per acre have not been quite as good as the increases obtained from fertilizing every year with 25 pounds of nitrogen per acre. On the other hand, the use of 100 pounds of nitrogen every other year has produced slightly better results than the use of 50 pounds of nitrogen every year. The increased yields from 50 pounds nitrogen every year or 100 pounds every other year are just barely profitable and the use of these heavier rates does not appear justified, when such a distinct advantage exists for the 25-pound rate.

Table 12. Forage production from Old Crested Wheatgrass plots fertilized every other year* with ammonium nitrate (33-0-0).
  Dry weight-lbs./acre Percentage increase over check
Year Check 25# N 50# N 100# N 25# N 50# N 100# N
1957 1239 1714 2013 2001 38.3 62.5 61.5
1958 1003 1016 1114 1250 1.3 11.1 24.6
1959 1094 1230 1266 1659 12.4 15.7 51.6
1960 1306 1813 1801 2187 38.8 37.9 67.5
4-year Average 1161 1443 1549 1774 24.3 33.4 52.8
*Fertilizer applied in spring 1957 and 1959.

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