Drought Resistance of Warm‐Season Putting Green Cultivars on U.S. Golf Association Root Zones with Varied Potassium

Autor: John L. Cisar, George H. Snyder, Alan L. Wright, Jerry B. Sartain, John E. Erickson, J. H. Rowland
Rok vydání: 2014
Předmět:
Zdroj: Agronomy Journal. 106:1549-1558
ISSN: 1435-0645
0002-1962
Popis: Drought resistance of putting green cultivars is receiving increased attention due to irrigation restrictions. Potassium, which reduces turfgrass tolerance to environmental stresses when de˜ cient, is oˆ en applied at rates equal to or greater than N in an attempt to increase its e˙ cacy. Drought resistance for recently established 'TifDwarf' (TD) and 'TifEagle' (TE) bermudagrasses [ Cynodon dactylon (L.) Pers. × C. transvaalensis Burt Davy], 'SeaDwarf' (SD) seashore paspalum ( Paspalum vaginatum Swartz), and 'PristineFlora' (PF) zoysiagrass [ Zoysia japonica Stued. by Zoysia tenuifolia (L.) Merr.] was evaluated under varied irrigation and K levels on a U.S. Golf Association (USGA)-speci˜ ed research green. Irrigation treatments were applied in the spring and fall of 2009 and spring 2010, and included 25, 50, and 100% of potential evapotranspiration (ETo), as calculated using the Blaney–Criddle equation. Nitrogen at 4.9 g m –2 30 d –1 and K (as KCl) in 1N:1K, 1N:2K, 1N:3K, and 1N:4K fertilization ratios were applied at the beginning of each experiment. All cultivars had objectionable wilting (>10%) at 25% ETo in 2009, although PF and SD had least in the fall. In 2010 PF and SD did not exhibit objectionable wilting at any irrigation level. At 50% ETo, TD and TE wilted objectionably in all experiments, as did PF in the fall of 2009. In 2010, the bermudagrasses exhibited objectionable wilting under daily irrigation at 100% ETo. Increasing K in relation to N failed to increase drought resistance for the cultivars studied. ˛ e bermudagrasses had the least drought resistance and PF and SD the most.
Databáze: OpenAIRE
Externí odkaz: