Pastures for Florida


est yields occurred, however, when the nitrogen was supple-
mented with other nutrients.
 The effect of nitrogen from different sources on composition
of carpet grass is given in Table 6. The protein content of un-

TABLE 5.-DRY YIELD OF CARPET GRASS (POUNDS PER ACRE) AS AFFECTED
BY NITROGEN FERTILIZERS ON A LEON SOIL NEAR GAINESVILLE, FLORIDA
 (1938-42).

 Nitrogen Source
 _(Pounds Dry Grass per Acre)
 Fertilizer Treatment I Calcium
 No Nitrate Sulfate of Uramon Cyana-
 Nitrogen of Soda Ammonia (42% N) mide
 ____(16% N) (20.5% N) (22% N)
 I
Superphosphate and
 potash ................... 1,670 2,930 2,680 2,410 2,540
Lime, superphosphate
 and potash ............ 1,610 2,820 2,690 2,710 2,430


Mean ............................ 1,640 2,875 2,685 2,560 2,485
Percent increase in
 yield .......................... 75 64 56 52

 1 Superphosphate-125 pounds 20% superphosphate applied per acre in 1938, 1940 and
1942.
 Potash-30 pounds of 50% muriate of potash applied per acre in 1938, 1940, 1941 and
1942.
 Lime-500 pounds applied in 1938 and 1940, and 1,000 pounds per acre in 1942. Nitro-
gen Source-24 pounds of nitrogen (N) per acre was applied in March and May each year.
24 pounds (N) is equivalent to 150 pounds of nitrate of soda.

 TABLE 6.-PROTEIN COMPOSITION OF CARPET GRASS AS AFFECTED BY
 NITROGEN SOURCES AND FERTILIZATION.

 Crude
 Treatment Protein

N o fertilizer ........................................................... ................. 99.8
Lime (L), phosphorus (P), potash (K) ................................ 10.1
N itrate of Soda ................................................ ................---- ... 11.7
Nitrate of soda and LPK .......................................................... 11.1
Sulfate of am m onia ................................................................... 12.1
Sulfate of ammonia and LPK ................................................ 11.5
Calcium cyanamide ..................................... ..... 11.3
Calcium cyanamide and LPK ............................................... 10.7
U ram on ....................................................................................... 12.5
U ram on and LPK ..................................................................... 10.8
 Analysis from composite samples during April 13 to June 12, 1939.

fertilized grass was 9.8 percent, as compared with a range of
10.8 percent to 12.1 percent when treated with nitrogen or
nitrogen with other minerals.