TX-53F Haby 07 Annual Rpt.pdf
TX-53F Haby 07 Annual Rpt.pdf
TX-53F Haby 07 Annual Rpt.pdf
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<strong>TX</strong>-53<br />
† Nitrogen rates of 60 and 120 lb of N applied per acre for each of five harvests<br />
‡ 2.1 tons ECCE 72 Franklin limestone applied to whole research site area.<br />
§ Applied one-half seasonal K rate plus 120 lb P 2 O 5 and 32.31 lb Mg/ac.<br />
Table 2. Rates of urea, mono-ammonium phosphate, muriate of potash, KMag, and KMag+P in grams † .<br />
Treatment Urea 11-52-0 KCl KMag ACT 62D<br />
60 lb N/ac<br />
1 141.1 432.6 0 0 0<br />
2 141.1 432.6 209.3 0 0<br />
3 141.1 432.6 7.46 550.6 0<br />
4 131.7 0 94.0 0 865.2<br />
5 141.1 432.6 418.6 0 0<br />
6 141.1 432.6 216.7 550.6 0<br />
7 131.7 0 303.3 0 865.2<br />
8 141.1 432.6 627.9 0 0<br />
9 141.1 432.6 426.0 550.6 0<br />
10 131.7 0 512.6 0 865.2<br />
120 lb N/ac<br />
11 385.6 432.6 0 0 0<br />
12 385.6 432.6 209.3 0 0<br />
13 385.6 432.6 7.46 550.6 0<br />
14 376.1 0 94.0 0 865.2<br />
15 385.6 432.6 418.6 0 0<br />
16 385.6 432.6 216.7 550.6 0<br />
17 376.1 0 303.3 0 865.2<br />
18 385.6 432.6 627.9 0 0<br />
19 385.6 432.6 426.0 550.6 0<br />
20 376.1 0 512.6 0 865.2<br />
† Grams of material applied to 10 x 18 ft plots as randomized treatments numbered 1 through 20 for each of four replications.<br />
Table 3. Tifton 85 bermudagrass dry matter (DM) response to K rates and KMag, ACT62D+KCl at two N<br />
rates on a limed, acid Darco loamy fine sand on the Coastal Plain of eastern Texas in 20<strong>07</strong>.<br />
N<br />
Bermudagrass yield by harvest date and total for season<br />
rate †<br />
May 31 June 28 July 30 Sept. 12 Nov. 6 Total yield<br />
lb/ac<br />
----------------------------------------------DM, lb/ac-----------------------------------------------<br />
60 1,403 ns ‡ 3,245 ns 3,059 ns 3,055 ns 1,342 ns 12,104 ns<br />
120 1,468 3,368 3,090 3,329 1,203 12,458<br />
K 2 O rate §<br />
0 620 b 1,597 c 1,428 c 1,617 c 581 c 5,843 c<br />
134 1,423 a 3,162 b 2,881 b 3,<strong>07</strong>9 b 1,061 b 11,605 b<br />
268 1,583 a 3,630 a 3,225 b 3,343 b 1,398 a 13,179 a<br />
402 1,572 a 3,698 a 3,667 a 3,679 a 1,588 a 14,204 a<br />
K Source <br />
KCl 1,466 ns 3,214 b 3,037 b 3,384 ns 1,269 ns 12,371 b<br />
KMag+KCl 1,468 3,565 a 3,024 b 3,303 1,402 12,762 b<br />
ACT 62D+KCl 1,644 3,710 a 3,711 a 3,414 1,376 13,855 a<br />
C.V. 18.9 14.5 16.1 11.9 22.8 11.9<br />
Interactions N rate X N rate X N rate X N rate X N rate X<br />
K rate K rate K rate K rate K rate<br />
P = 0.01 P = 0.05 P = 0.01 P = 0.05 P = 0.01<br />
† N rates applied at green up and after each of the first four harvests. Each regrowth received N rates.<br />
‡ ns = non-signif. diff.; values in a column and treatment group followed by a similar letter are not significantly different<br />
statistically.<br />
§ Averaged over N rate and K source<br />
Averaged over N rate and K 2 O rate<br />
3
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