TX-53F Haby 07 Annual Rpt.pdf

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TX-53 Table 16. Tifton 85 bermudagrass P conc. response to N and K rates and K, Cl, and S sources in 2007. N rate Plant P concentration † lb/ac/harv. Harvest 1 Harvest 2 Harvest 3 Harvest 4 Harvest 5 Season avg. ---------------------------------------------------%-------------------------------------------------- 60 0.52 b 0.49 0.39 0.43 0.32 0.43 120 0.56 a 0.50 0.36 0.40 0.29 0.42 K rate lb K 2 O/ac 0 0.67 a 0.59 a 0.55 a 0.50 a 0.36 a 0.54 a 134 0.57 b 0.53 b 0.37 b 0.44 b 0.30 b 0.44 b 268 0.50 c 0.47 c 0.37 b 0.40 c 0.31 b 0.41 c 402 0.52 c 0.45 c 0.34 b 0.37 d 0.29 b 0.39 c K Source KCl 0.54 0.50 a 0.38 a 0.43 a 0.37 a 0.44 a KMag+KCl 0.50 0.48 b 0.36 b 0.40 b 0.27 b 0.40 b ACT 62D+KCl 0.54 0.47 b 0.33 c 0.37 c 0.25 b 0.39 b R 2 0.77 0.81 0.84 0.77 0.71 0.90 c.v. 9.72 6.46 9.76 9.04 17.30 5.01 † Values in a column/group followed by a dissimilar letter are significantly different statistically (α = 0.05). Plant C concentration was unaffected by N rate and declined as yield increased in the first three harvests and season average, but in the fourth and fifth harvests C content was unaffected by increased K application rates. Even though statistically significant differences are indicated, there is little difference in the C content of bermudagrass treated with KCl, KMag+KCl, or ACT 62D+KCl. Table 17. Tifton 85 bermudagrass C conc. response to N and K rates and K, Cl, and S sources, 2007. N rate Plant C concentration † lb/ac/harv. Harvest 1 Harvest 2 Harvest 3 Harvest 4 Harvest 5 Season avg. --------------------------------------------------%--------------------------------------------------- 60 44.42 45.27 45.41 46.10 46.63 45.57 120 44.34 45.30 45.59 46.44 46.35 45.60 K rate lb K 2 O/ac 0 45.19 a 45.84 a 46.15 a 46.75 46.41 46.07 a 134 44.38 b 45.44 b 45.70 b 46.41 46.72 45.73 b 268 44.33 b 45.19 c 45.43 c 46.03 46.36 45.47 c 402 44.17 b 45.05 c 45.16 d 46.21 46.43 45.40 c K Source KCl 44.42 a 45.33 a 45.50 a 46.14 46.19 b 45.52 ab KMag+KCl 44.25 ab 45.30 a 45.53 a 46.37 46.78 a 45.65 a ACT 62D+KCl 44.20 b 45.06 b 45.26 b 46.14 46.53 ab 45.44 b R 2 0.67 0.79 0.76 0.43 0.61 0.70 c.v. 0.67 0.50 0.74 1.54 1.28 0.53 † Values in a column/group followed by a dissimilar letter are significantly different statistically (α = 0.05). After the first year of treatment application and bermudagrass production, there were no statistically significant treatment effects on pH, P, Ca, or Cl from N or K rates or K sources.. Increased yields at the higher N rate lowered soil K and Mg. Increasing K rates significantly increased levels of Mehlich III extractable soil K. The KCl and KMag+KCl treatments significantly increased extractable soil K compared to ACT 62D+KCl. The KMag+KCl treatment significantly increased extractable Mg compared to KCl or ACT 62D+KCl treatments. The ACT 62D+KCl treatment significantly raised the level of S in the 0- to 6-inch depth compared to KCl alone or KMag+KCl. The Darco soil was not sampled deeper than six inches in fall of 2007. Zinc levels in soil were not analyzed in these soil samples in 2007. 10
TX-53 Table 18. Soil pH, P, K, Ca, Mg, S, and Cl levels in the 0-6-in depth of Darco loamy fine sand after treatments with N and K rates, and K, Cl, and S sources for Tifton 85 bermudagrass- samples collected after the 2007 growing season. N rate lb/ac/harv. -------------------------Soil pH and residual plant nutrients-------------------------- pH P K Ca Mg S Cl ---------------------------------------ppm-------------------------------------- 6.03 66 44 a 869 57 a 11 13 5.84 61 32 b 685 43 b 11 11 60 120 K rate lb K 2 O/ac 0 5.76 69 20 d 714 39 10 13 134 5.91 67 28 c 725 46 10 13 268 5.97 61 40 b 779 59 10 12 402 5.97 61 53 a 849 48 11 12 K Source KCl 5.94 62 44 a 831 43 b 9 b 12 KMag+KCl 6.00 65 42 a 799 72 a 9 b 12 ACT 62D+ KCl 5.93 62 35 b 724 37 b 14 a 12 R 2 0.71 0.49 0.90 0.28 0.64 0.66 0.40 c.v. 2.2 17.2 15.4 77.5 48.0 19.6 25.9 † Values in a column/group followed by a dissimilar letter are significantly different statistically (α = 0.05). 11
Page 1 and 2: TX-53 Evaluation of KMag and KMag+P
Page 3 and 4: TX-53 † Nitrogen rates of 60 and
Page 5 and 6: TX-53 bermudagrass. This carried ov
Page 7 and 8: TX-53 Table 10. Tifton 85 bermudagr
Page 9: TX-53 Table 14. Tifton 85 bermudagr

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