Yield, fruit quality, and tree health of 'Allen Eureka' lemon on seven rootstocks in Saudi Arabia

Since environmental conditions and cultural practices vary from one area to another, yield, fruit quality, and tree health measurements were conducted over 9 years to evaluate the long-term adaptability and performance to local conditions of 'Allen Eureka' lemon (Citrus limon Burm.f.) budded on seven rootstocks in the Najran area of Saudi Arabia. Trees on Citrus macrophylla (CM), Volkamer lemon (VL), and Cleopatra mandarin (Cleo) were the most productive, while trees on Amblycarpa (Amb), rough lemon (RL), Citrus taiwanica (CT), and sour orange (Citrus aurantium L.) (SO) had the lowest yield. Fruit from trees on CM and VL were also the largest in size and had the thickest rind, but were among those that had the lowest juice content and lowest total soluble solids. None of the trees on Cleo, VL, or RL died until the 14th year. However, there was a high mortality rate and severe tree decline on SO, CT, and Amb.