Irrigation positively affects the chestnut’s quality: The chemical composition, fruit size and sensory attributes

•Irrigation’s effect on chestnuts chemical composition, fruit size and tastiness.•Micro-sprinkler’s chestnuts were the firmest and were as sweet as drip's chestnuts.•Non-irrigated chestnuts were the sweetest but with the smaller calibre.•Irrigation increases chestnut’s size but keeps its nutritional value.