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Dep. of Plant Sciences, Univ. of Arizona, Tucson, AZ 85721
Texas A&M Res. & Ext. Ctr., 17360 Coit Rd., Dallas, TX 75252
Soil and Crop Science Dep., Texas A&M Univ., College Station, TX 77843
* Corresponding author.
Declining availability of water for landscape irrigation has increased the need for drought-resistant turfgrasses. Though drought-resistance mechanisms are known to include deep rooting in some plants, little is known concerning zoysiagrass rooting characteristics. This study was conducted to determine if differences in rooting parameters exist among zoysiagrasses, and if they are associated with drought resistance. Twentyfive zoysiagrasses cultivars and species [Zoysia japonica Steud., Z. matrella (L.) Merr., and Z. japonica Steud. x Z. tenuifolia Willd. ex Trin.] were studied in polyethylene tubes in a glasshouse. Differences were observed for average maximum root depth (AMRD), total root weight, and root numbers and weights at increasing 100-mm depth increments. Average maximum root depth was positively correlated with total root weight and root number and weight at increasing 100-ram depth increments. Grasses with superior AMRD, total root weight, and root numbers at deeper profile depths (300–500 mm) included QT2047, El Toro, DALZ8512, TC5018, Meyer, DALZ8514, and DALZ8516. In a previously reported field experiment, 11 of the 25 zoysiagrasses were rated for percent of plot area covered by green turfgrass (an indicator of drought resistance) under three levels of irrigation (0, 35, and 100% of turfgrass evapotranspiration [ET]). Average maximum root depth, total root weight, and root numbers at 200-, 300-, and 400-mm depths in polyethylene root tubes were positively correlated with percent green plot cover in the field under deficit irrigation (0 and 35% ET), indicating that rooting depth, weight, and branching at lower depths are important droughtresistance mechanisms in zoysiagrasses.
Received for publication April 29, 1994.
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