Record 233 of 382 - CRIS/ICAR 9/96 TI: HEAT STRESS OF SMALL FRUIT CROPS AND METHODS FOR STRESS ALLEVIATION IN: HELLMAN-E-W PO: HORTICULTURE. KANSAS STATE UNIV LO: MANHATTAN, KANSAS 66506. FY: 1990 CL: PRIMARY CLASSIFICATION GENERAL CLASSIF. RPA ACTVTY CMMDTY SCNCE PRCNT PRGM JTC R304 A4900 C1000 F0212 100% P3.13 J2A PH: R304 (Biological-Efficiency-Fruit,-Vegetables); A4900 (Biology-of-Plants-and-Animals); C1000 (Deciduous-and-Small-Fruits-and-Nuts); F0212 (Biology-Environmental,-Systematic-Plant) GH: P3.13 (Fruit); J2A (Plant-Production) SC: S1030 (Berries-and-Cane-Fruits,-General) 100% DE: STRAWBERRIES; RASPBERRIES; HEAT-STRESS; PLANT-WATER-RELATIONS; STRESS-TOLERANCE; ENVIRONMENTAL-STRESS; SPRINKLER-IRRIGATION; HIGH-TEMPERATURE; TRANSPIRATION; ANTI-TRANSPIRANTS; PLANT-TRANSPIRATION; EVAPORATIVE-COOLING; PLANT-GROWTH; GROWTH-INHIBITORS; SMALL-FRUIT CT: Basic 0%; Applied 100%; Developmental 0% OB: Determine critical heat stress temperatures for strawberry and evaluate the use of microsprinkler irrigation for evaporative cooling to relieve stress. Examine plant water relations of red raspberry under high temperatures, and evaluate the following cultural practices for potential to alleviate heat stress. Film-forming antitranspirants. Microsprinkler irrigation for evaporative cooling. AP: Strawberry plants will be subjected to heat stress to determine growth-limiting temperatures. Sprinkler irrigation will be used on field-grown strawberry and raspberry for evaporative cooling to relieve heat stress. Film-forming antitranspirants will be evaluated for improving plant water status of raspberry at high temperatures. PR: 8707 TO 9006 Heat stress studies were conducted on strawberries grown in controlled environment chambers. Plants were subjected to a series of day/night temperature regimes (30/20, 35/25, 40/30C) to determine a critical heat stress temperature. Fruit weight was significantly reduced by the highest temperature regime. Soluble solids content of fruit was highest in berries grown under the lowest temperature regime. Runner growth of strawberry plants was also significantly reduced at the highest temperature regime tested, suggesting that the critical high temperature range for strawberry is between 35 and 40C. Field studies were conducted using sprinkler irrigation for evaporative cooling of strawberry plants. Overhead irrigation with microsprinklers reduced leaf temperature as much as 15C when relative humidity was 29% and wind speed approximately 5.3 meters/sec. Part of the cooling effect was due to the initial temperature of the irrigation water (16C), but sustained temperature reductions varied considerably ranging from 7 to 30 minutes. The amount of leaf temperature reduction and the duration varied considerably depending on climatic conditions. Evaporative cooling is favored by low relative humidity and windspeed adequate to provide circulation of air above the canopy. PB: 8707 TO 9006 HELLMAN, E.W. and TARARA, J. 1987. Strawberry heat stress and evaporative cooling studies. IN: 1987 Fruit Research Report. Dept. Horticulture, Kansas State University, Manhattan. PB: 8801 TO 8812 HELLMAN, E.W. and TRAVIS, J.D. 1988. Growth inhibition of strawberry at high temperatures. Advances in Strawberry Production 7:36-38. PB: 8707 TO 8712 HELLMAN, E.W. and TRAVIS, J. 1987. Strawberry heat stress and evaporative cooling studies. In: 1987 Fruit Research Report. Department of Horticulture, Kansas State University. OC: 001430 IC: 001928 SU: Region 3 (North-Central). PS: TERMINATED UD: 8704 UP: 9104 PP: 9006 --------------------------------------------------------------------------------