Effects of Delayed Harvest on Nutrient Accumulation of Bearing Base Shoot in Shine Muscat Grape

LOU Yusui; LÜ Zhongwei; SHANG Hongquan; CUI Xiaoyue; LU Huiran; ZHANG Ke; WU Wenying; FAN Hongjie

doi:10.15933/j.cnki.1004-3268.2026.03.013

Abstract：In order to use fruit delayed harvest technology better,the nutrient accumulation of bearing base shoots and the inflorescence rates were compared among treatments of different yield load of cluster hanging and no cluster hanging.10-year-old Shine Muscat grapevines were used as materials.During the maturity period,the clusters were pruned by leaving one cluster per one(F1),one point five(F2),two(F3),three(F4),and four(F5)shoots.All clusters were cut off as the control(CK).After 64 days of fruit maturity,all the other clusters were cut off.Results showed that the contents of malondialdehyde and starch increased gradually,the contents of total nitrogen,total phosphorus,and 17 amino acids first increased and then decreased with the yield load level decreasing.F3-CK had the highest soluble sugar content(18.98 mg/g)in bearing base shoot,while F5-CK showed the highest total potassium content(2.39%).The contents of soluble sugar and total phosphorus,as well as inflorescence rate and double inflorescence rate were lower in the cluster hanging treatments than those in the no cluster hanging treatments on the same tree.Compared with CK,delayed harvest reduced the double inflorescence rate in the second year significantly.The double inflorescence rate of F3 decreased by 76.3%compared with the control.The treatments of F3,F4 and F5 did not affect or promote the accumulation of soluble sugar,starch,total nitrogen,total phosphorus,and total potassium in the bearing base shoot and the inflorescence rate in the second year.However,the treatments of F1,F2 and F3 promoted the accumulation of the most amino acids in the bearing base shoot.Therefore,it should be pruned by retaining one cluster per two or more shoots,with a yield of 17.09 t/ha or less,when delayed harvest was implemented in Shine Muscat grape to ensure enough nutrient accumulation and inflorescence rate.