[Water - growth relationship in highbush blueberry (Vaccinium corymbosum L.) under microjet and drip irrigation. First year after plantation]
1991
Jaureguiberry P, Berta
A research was carried out at the Experimental Station of the University of Concepcion in Chillan, to determine: a) The water requirements for highbush blueberries during their first year after plantation. b) The growth response obtained from highbush blueberries, when watered by microjet or by drip irrigation with increasing levels of water reposition. c) The crop coefficients Kc recommended. The statistical experimental design was a completely random block, in a factorial arrangement with two treatments, four subtreatments and four replications. The plantation of the Bluetta variety was made with plants brought from shading, in October 1990. The planting was done at 1.5 by 3.0 meters. The treatments consisted of two irrigation methods: microjet and drip. The subtreatments consisted in the reposition of 15%, 30%, 45% and 80% of the potential evapotranspiration, calculated on the basis of a class A evaporation pan, located at the site of the experiment. The main conclusions of this research are: 1. The plants that were drip irrigated grew more than those irrigated by microjet. 2. In microjet irrigation, the best growth was obtained with a level of reposition of 45% of the potential evapotranspiration. Levels around 60% of the ETpot were excessive and detrimental to growth. 3. In drip irrigation, the best growth was obtained with a level of reposition of 60% of the potential evapotranspiration with the possibility of obtaining an even better growth if more water were applied. 4. The highest water demand occurs in February with a real evapotranspiration of 15.24 liters per plant/day for microjet irrigation and 18.62 for drip irrigation. The maximum crop coefficient Kc for February were 0.556 for microjet irrigation and 0.679 for drip irrigation
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