Productive and Qualitative Responses to Deficit Irrigation on Orange Trees
The necessity of water savings and of reducing costs in agriculture involve the need to develop irrigation scheduling techniques that minimise any resulting impact on yield and fruit quality. Aim of the research was to monitor the vegetative and productive responses to different regulated deficit irrigation (RDI) strategies on mature orange trees cv Tarocco , on sour orange rootstock during 3 years (2003-2005). Four treatments were applied: Tl which was irrigated at 100％ ETc (crop evapotranspiration) ; T2, irrigated at 75％ ETc; T3 and T4, irrigated at 50％ ETc, but with different starting irrigation period. Amount of irrigation water was also modified according to predawn leaf water potential (ψL)measured weekly. The amount of water applied was less than what scheduled in the T2 treatment that showed a 38％ reduction; nevertheless, yield and fruit weight were similar to Tl. T3 and T4 treatments, instead, showed a significant decrease in yield and fruit weight than fully irrigated treatment, with a slower fruit growth rate compared to Tl and T2 treatments. Total soluble solids, titratable acidity and vitamin C contents were higher in all RDI treatments; Anthocyanin and vitamin C contents showed the highest values in T4. Leaf diagnostic evidenced that the different water volumes influenced nitrogen content, which was higher in the fully irrigated treatment.
Orange Deficit irrigation Yield Quality
F. Stagno C. Germana A. Giuffrida E. Tribulato F. Intrigliolo A. Continella
CRA- Centra di Ricerca e sperimentazione per VAgnumicoltura e le Colture Mediterranee, Corso Savoia Dipartimento di OrtoFloroArboricoltura e Tecnologie Agroalimentari, Urdversit degli Studi di Catania
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
745-748
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）