Light regulated deficit surge-root irrigation improvement of yield,quality and water use efficiency of mountain apple
Aim to explore a high-efficient production surge-root irrigation system for mountain apples in northern Shaanxi,a 7-year-old mountain apple(Hanfu)was chosen as the test material.Full irrigation was selected as the control group(CK)in the full growth stage in which 100％Qf and 85％Qf were de-fined as upper and lower irrigation limit value.Four RDI(regulated deficit irrigation)levels namely light deficit irrigation(DIL),moderate 1 deficit irrigation(DIMI),moderate 2 deficit irrigation(DIM2)and severe deficit irrigation(DIS)were designed in the sprout leaves stage(stage I)and fruit expansion stage(stage Ⅲ),respectively.The irrigation limits of them are 90％,75％,60％and 45％of control group,respectively.A randomized block design was used to analyze the responses of apple photosynthesis,yield,quality,and water use efficiency of regulated deficit irrigation in mountainous areas of northern Shaanxi.The results show that the photosynthetic characteristics of apple leaves in stage Ⅲ are stronger than those in stage I.In the same phenological period,there is no significant difference in photosynthetic capacity between DIL and CK(P＞0.05),and the other treatments are weakened.Compared with CK,the yield,irrigation water use efficiency(IWUE)and consumption wa-ter use efficiency(CWUE)of Ⅰ-DIL and Ⅲ-DIL treatments do not see significant increase(P＞0.05),while the other treatments encounter a decrease.The yield of Ⅲ-DIL treatment is the highest(31 358 kg/hm2),followed by Ⅰ-DIL treatment(31 239 kg/hm2).The comprehensive quality of DIL and CK is better and has no significant difference(P＞0.05).Therefore,the apple yield and quality encounter significant improvement owing to the activity of the light RDI in the sprout leaves stage(Ⅰ-DIL treatment)and light RDI in the fruit expansion stage(Ⅲ-DIL treatment).
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