GROWTH OF WILLIAMS' BON CHRETIEN PEAR FRUIT UNDER REGULATED DEFICIT IRRIGATION (RDI).
In peach and pear orchards RDI has been used to reduce vegetative vigour during the period of rapid vegetative growth early in the season. This is followed with full irrigation during the subsequent period of rapid fruit growth. Measuring fruit size continuously on the tree showed that on both deficit and fully irrigated trees fruit shrank during the day and expanded at a similar rate at night. After a deficit treatment was changed to full irrigation fruit growth remained positive through the day and was similar to the control rate at night. It appears that lower osmotic potential developed during the deficit period maintained turgor and day time growth in ex-deficit fruit but did not increase night time growth above the previous rate under deficit conditions or the rate seen in control fruit.
Jerie, P.H., Mitchell, P.D. and Goodwin, I. (1989). GROWTH OF WILLIAMS' BON CHRETIEN PEAR FRUIT UNDER REGULATED DEFICIT IRRIGATION (RDI).. Acta Hortic. 240, 271-274