National Approved Jade 20200027 Crop Name: Corn Variety Name: Longkeyu 702 Applicant: Heilongjiang Longke Seed Industry Group Co., Ltd. Breeder: Heilongjiang Longke Seed Industry Group Co., Ltd. Variety Source: LKA23－32×LKB1414 Characteristic characteristics: The northern extremely early spring maize group emerged to mature at 117.8 days, which was 0.5 days later than the control Demeiya No.1. Seedling leaf sheaths are light purple, leaves are dark green, leaf margins are green, anthers are yellow, and glumes are green. The plant is compact, with a plant height of 240 cm, a spike height of 85 cm, and a plant with 17 leaves. The ear is long and tapered, the ear length is 17.8 cm, the number of ear rows is 12-14, the ear thickness is 4.55 cm, the cob is white, the grain is yellow, and the grain is half-dented, and the 100-seed weight is 35.4 grams. Inoculation identification, susceptible to large spot disease, susceptible to head smut, high susceptibility to gray spot, resistance to stalk rot, resistance to ear rot, grain weight 748 g/L, crude protein content 9.76%, crude fat content 4.54%, crude The starch content is 74.02%, and the lysine content is 0.27%. Yield performance: Participated in the northern extremely early spring corn group consortium regional test from 2017 to 2018, with an average yield of 717.9 kg per mu in two years, an increase of 5.67% over the control Demeiya 1. In the production test in 2019, the average yield per mu was 637.7 kg, which was 3.2% higher than the control Demeiya No. 1. Cultivation technology points: This variety is suitable for planting on medium and above plots. Sow in early May, with a density of 6000 plants/mu. base fertilizer is 100 kg/mu of high-quality organic fertilizer, 15 kg/mu of diamine phosphate and 1 kg/mu of zinc sulfate, and 3 kg/mu of potassium sulfate can be added if conditions permit. Before and after jointing, combine cultivating and topdressing urea 15 kg/mu, and timely cultivating and weeding, three shovel three times. The corn is harvested after the maturity period. Opinion: This variety meets the national maize variety certification standards and passed the certification. It is suitable for the fourth accumulative temperate zone in the northern and southeastern mountainous areas of Heilongjiang Province, which is a very early spring corn type area in the north, parts of Hulunbuir City in Inner Mongolia, parts of Xing'an League, parts of Xilin Gol League, parts of Ulanchabu League, and parts of Tongliao City. , Parts of Chifeng City, northern Baotou City, northern Hohhot City, some mountainous areas in Yanbian Prefecture and Baishan City in Jilin Province, Bashang in northern Hebei Province and parts of Zhangjiakou City and Chengde City where the dam is connected, Datong City and Shuoshan City in northern Shanxi Province Cities, Xinzhou, and Luliang are grown in areas above 1200 meters above sea level, in mountainous areas above 2000 meters above sea level in southern Ningxia, and regions above 2000 meters above sea level in Lanzhou City, Dingxi City, Linxia Prefecture and Zhangye City, Gansu Province.