LOW TUNNEL COVERINGS AND PLANT TYPE AFFECT PRODUCTIVITY OF DAY-NEUTRAL STRAWBERRIES
Increasing yield is a goal of any strawberry grower. One emerging tool for enhancing yields is tunnel coverings. Low tunnel covers can shade or filter light, which can be beneficial for growing strawberries. The data shows that wavelength-shifting plastic row covers allowed for increased yield and better conditions for plants to thrive while also extending the harvest season. Age of the plant when planting is another factor growers can manipulate to increase yield. Planting strawberries that had been started in the greenhouse for two months, increased the total marketable yield when compared to the bare rooted plants that underwent the same treatment. The hypothesis was the best conditions for increased yield would involve pre-started plants under wavelength-shifting plastic. The best-performing treatments each year were greenhouse-started plants and the wavelength-shifting plastic. When used in tandem, these treatments produced high marketable yields. Typically, day-neutral strawberries are treated as an annual crop. The experiment investigated different overwinter strategies to see if it would be economical to overwinter plants and obtain an early second-year yield. These overwintering treatments included covering with straw, late-season fertilizer treatments, pinching flowers at different dates, and a no-cover treatment. The hypothesis was that some of these treatments would influence the levels of carbohydrate in the crown at the onset of winter and would subsequently influence winter survival. Treatments that were expected to decrease carbohydrate levels (e.g. late fertilization with N) had lower winter survival and those where fruiting was terminated early in fall to increase carbohydrate levels had higher overwintering success. The straw covering had the best plant survival and highest residual carbohydrate content by spring, but there were concerns about whether these treatments would economically make sense. Covering with straw or deflowering in October both incur costs. The results suggest the best strategies for increasing strawberry yield are using wavelength-shifting plastic low tunnel covers on pre-started plants and treating them as an annual crop, rather than attempting to achieve marginal and uncertain gains from a second spring crop.