Breeding report of high starch maize hybrid "Jinongda 568".

A maize hybrid "Jinongda 568" was accomplished using "JND364" as female parent and "G1513" as male parent.Its yield was 10 488.3 kg/hm2 in the 2-year regional test,10.5% higher than that of the control variety "Xintiedan 10".And its yield was 8 729.7 kg/hm2 in the production test,15.0% higher than that of the control variety "Denghai 9"."Jinongda 568" was examined and approved by Jilin Evaluation Committee of Crop Variety in January of 2006."Jinongda 568" is a single-cross variety of high starch maize.The ear of the hybrid is cylindrical,20.1 cm in length,16 in ear rows.The kernels are yellow color,and 249 g in weight per ear.The weight of 100 kernels was 41.5 g.The growing period from seedling emergence to maturity was 131 days.The hybrid is resistant to diseases and lodging.It suits to be planted in the late mature area of Jilin province.