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United States Department of Agriculture (USDA) 2002

DEVELOPING MANAGEMENT STRATEGIES FOR THE CONTROL OF LOCALIZED DRY SPOTS CAUSED BY WATER REPELLENT SOILS

Dry Spots Water Repellent Soils

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : DEVELOPING MANAGEMENT STRATEGIES FOR THE CONTROL OF LOCALIZED DRY SPOTS CAUSED BY WATER REPELLENT SOILS

Identification : GEO00986

Pays : Etats Unis

Durée : Oct 1, 2002 à Oct 1, 2009

Domaine : Soil, Plant, Water, Nutrient Relationships ; Conservation and Efficient Use of Water ; - Turf ; Water resources ; People and communities, general/other ; Research equipment and methods, general/other ;

Partenaire : UNIVERSITY OF GEORGIA 200 D.W. BROOKS DR ATHENS,GA 30602-5016

Objectifs
1. Determine the influence of thatch and mat on wetting agent efficacy. 2. Categorize the efficacy of wetting agent products in relation to varying levels of soil hydrophobicity. 3. Test various sands and organic amendments commonly used for root zone mixes and topdressing for water repellency. 4. Determine management practices that encourage maximum root growth for turfgrasses growing in hydrophobic soils

Descriptif
Objective 1. A state wide request to Georgia golf course superintendents for turf having excessive thatch and/or mat accumulation will be made. This approach has been successfully used in the past for obtaining specific types of plant materials and soils. Moisture content using time domain reflectometry and the degree of hydrophobicity using the molarity of ethanol droplet technique described by will be conducted at 2.5 cm depth increments. Studies will be conducted with both cool and warm season turfgrasses having varying amounts of thatch and mat. Objective 2. Over the past few years a technique has been developed that allows hydrophillic sand to be altered to a hydrophobic sand that has a predetermined level of water repellency. Four sands having MED values of 1.0, 2.0, 3.0 and 4.0 will be used to evaluate the efficacy of several commonly used wetting agents. Each wetting agent will be applied at recommended rates to all four water repellent sands and efficacy determined via the MED method. The study will be initially conducted in small containers in the greenhouse with the possibility of testing certain products in the field. Objective 3. Various sands and organic soil amendments used for the construction of golf greens and sports fields will be evaluated for the presence soil water repellency. With the assistance of the soil physical testing lab, Hummel Labs, Inc., sands and organic amendments will be collected from around the United States and water repellency determined via the MED method. In addition to water repellency, each material will be characterized in terms of origin and all applicable physical and chemical properties. Objective 4. The objective of the first management study will determine the effects of hydrophobic soil on the seasonal rooting characteristics of Tifeagle bermudagrass. A similar study was completed in 2000 with Penncross creeping bentgrass. The results of that study clearly showed that the water repellent soil layer significantly altered the normal root growth of creeping bentgrass. Currently, there is no similar type of information available for warm season turfgrasses.

Présentation : USDA

Page publiée le 12 décembre 2015, mise à jour le 30 octobre 2017