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 />
Table 14. Tifton 85 bermudagrass Cl conc. response to N and K rates and K, Cl, and S sources, 20<strong>07</strong>.<br />
N rate Plant Cl concentration †<br />
lb/ac/harv. Harvest 1 Harvest 2 Harvest 3 Harvest 4 Harvest 5 Season avg.<br />
--------------------------------------------------ppm------------------------------------------------<br />
60 2708 1621 a 1743 1164 1153 1678 a<br />
120 2411 1229 b 1418 1031 885 1395 b<br />
K rate<br />
lb K 2 O/ac<br />
0 675 d 540 d 572 c 636 c 560 c 597 d<br />
134 1871 c 1<strong>07</strong>9 c 1471 b 968 b 923 b 1262 c<br />
268 2992 b 1588 b 1671 b 1097 b 1013 b 1672 b<br />
402 3444 a 1903 a 1935 a 1382 a 1274 a 1988 a<br />
K Source<br />
KCl 3405 a 1834 a 1939 a 1302 a 1206 a 1937 a<br />
KMag+KCl 2272 c 1199 c 1602 b 1011 b 899 b 1396 c<br />
ACT 62D+KCl 2630 b 1538 b 1537 b 1135 b 1105 a 1589 b<br />
R 2 0.94 0.92 0.80 0.69 0.73 0.93<br />
c.v. 11.86 14.35 18.47 21.81 22.70 10.94<br />
† Values in a column/group followed by a dissimilar letter are significantly different statistically (α = 0.05).<br />
Table 15. Tifton 85 bermudagrass Cl uptake response to N and K rates and K, Cl, and S sources, 20<strong>07</strong>.<br />
N rate Plant Cl uptake †<br />
lb/ac/harv. Harvest 1 Harvest 2 Harvest 3 Harvest 4 Harvest 5 Season total<br />
-------------------------------------------------lbs/ac------------------------------------------------<br />
60 3.9 5.5 a 5.6 3.6 1.6 20.3<br />
120 3.9 4.3 b 4.6 3.6 1.1 17.5<br />
K rate<br />
lb K 2 O/ac<br />
0 0.4 c 0.9 d 0.8 d 1.0 c 0.3 d 3.5 d<br />
134 2.7 b 3.4 c 4.2 c 3.0 b 1.0 c 14.3 c<br />
268 4.7 a 5.8 b 5.4 b 3.7 b 1.4 b 20.9 b<br />
402 5.4 a 6.9 a 7.1 a 5.1 a 2.0 a 26.6 a<br />
K Source<br />
KCl 5.0 a 5.9 a 6.0 a 4.5 a 1.6 23.0 a<br />
KMag+KCl 3.4 b 4.4 b 4.9 b 3.3 b 1.3 17.3 b<br />
ACT 62D+KCl 4.4 a 5.8 a 5.8 a 3.9 ab 1.6 21.5 a<br />
R 2 0.83 0.87 0.77 0.67 0.68 0.86<br />
c.v. 26.6 22.0 27.9 32.7 42.1 20.6<br />
† Values in a column/group followed by a dissimilar letter are significantly different statistically (α = 0.05).<br />
Phosphorus concentration in bermudagrass was relatively unaffected by N rate, declined with increased<br />
yield because of increasing rates of applied K, and was generally significantly lower in grass grown with<br />
ACT 62D+KCl and KMag+KCl compared to KCl only.<br />
9
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