EFFECTS OF MANUAL PRUNING ON HAZELNUT YIELD AND FRUIT QUALITY
Even if in Italy hazelnut pruning is not so common, a hazelnut grower asked our Institute to help him to consider the opportunity to prune hazelnut like plants of other fruit species. Aiming to give an answer, we planned pruning experimental trials. These trials considered 4 different pruning times and were applied to a hazelnut orchard of 10 years old, starting in the autumn 2007. The studied dates were 8 November and 12 December 2007. In the following year (2008) the plants were pruned on 28 February and 29 March. All the pruning theses were compared with an unpruned test. The pruning of each date was applied to 20 plants, chosen in a hazelnut orchard, located in Lequio Berria (Langhe District, Piedmont). The time needed for the pruning was recorded and the results ranged between 162 to 177 s/plant, that means about 16 h/ha. At the harvest time for the all plants of each thesis and for the test, the yield was recorded and a sample of 2 kg was harvested for fruit quality analysis. The harvest data show that pruning on different dates significantly increased the production with the exception of 2011. From the cumulated yield it appears that the all pruning periods significantly increased the yield, especially the plants pruned on 12 December and 28 February. It seems that these two dates are the best to prune young hazelnut plants. About the fruit quality, considering fruit production/ha, kernel fruit ratio and the percentage of nuts without any defects, we obtain the quantity of kernels without any defects by hectare directly suitable for the food industry. This parameter results significantly higher for the nuts obtained from the plants pruned on 12 December and 28 February.
Roversi, A. and Malvicini, G.L. (2014). EFFECTS OF MANUAL PRUNING ON HAZELNUT YIELD AND FRUIT QUALITY. Acta Hortic. 1052, 175-178
fruit quality, plant production, hazelnut pruning