A new navel orange cultivar 'Qicheng 52'.

'Qicheng 52'is a new cultivar developed from the fine mutation lines of'Newhall'navel orange.The fruits are oval in shape,with orange peel,seedless.The fruit weight is 180-270 g.The soluble solids content is 11.5%-13.0%,total sugar is 8.5%-11.8%,the titratable acid is 0.46%-0.73%,and vitamin C is 41.8-53.6 mg · kg-1.The fruit quality is excellent.It bears early,with high and stable yield,good fruit quality and high resistance to diseases.