玉米新品种卫农998是以LWQ为母本、宁121为父本选育的高产优质长穗粮饲兼用品种。在2017年宁夏联合体引(扬)黄灌区中晚熟玉米品种区域试验中，卫农998平均折合产量为15 697.5 kg/hm2，较对照品种先玉335增产2.50%。在2018年宁夏联合体引(扬)黄灌区中晚熟玉米品种生产试验中，卫农998平均折合产量为15 711.0 kg/hm2，较对照品种先玉335增产4.94%。卫农998属中晚熟品种，株型紧凑，平均株高为301 cm。平均百粒重为36.3 g，平均出籽率为87.8%，容重776 g/L。籽粒含粗蛋白质(干基)87.8 g/kg、粗脂肪(干基)35.8 g/kg、粗淀粉(干基)755.6 g/kg、赖氨酸(干基)2.8 g/kg。田间生长整齐，出苗快、苗势强，结实性好，高抗腐霉茎腐病，抗丝黑穗病，中抗大斑病，抗倒伏，丰产稳产，品质优，适应性强。适宜在内蒙古、宁夏、甘肃等中晚熟玉米种植区及类似生态气候区域种植。

Weinong 998 is a new corn cultivar with high yield， high quality， long ear grain and grain feeding combination forage， was bred with LWQ and Ning 121. The average yield of Weinong 998 was 15 697.5 kg/hm2， and 2.50% higher than that of the control Xianyu 335 in the Regional Test of middle-late corn cultivars in Yanghuang Irrigation Area of Ningxia Hui Autonomous Region in 2017. The average yield of Weinong 998 was 15 711.0 kg/hm2 and 4.94% compared with the control Xianyu 335 in the Production Test of middle and late corn cultivar in Yanghuang Irrigated Area of Ningxia Hui Autonomous Region in 2018. Weinong 998 is a medium and late maturing cultivar with compact plant type and the average plant height of 301 cm. The average 100-seed weight is 36.3 g， the average seed yield is 87.8%， and the bulk density is 776 g/L. The grains contained crude protein (dry base) is 87.8 g/kg， crude fat (dry base) is 35.8 g/kg， crude starch (dry base) is 755.6 g/kg and lysine(dry base) is 2.8 g/kg. The fields grow neatly， the seedlings emerge quickly， the seedlings are strong， and the seed is good high resistance to stem rot， resistance to silk smut， medium resistance to large spot disease， lodging resistance， high yield and stable， excellent quality， strong adaptability. It is suitable to be growing in Inner Mongolia， Ningxia， Gansu and other middle and late corn planting areas and similar ecological climate areas.

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宁夏农林科学院科技创新先导项目(NKYG-17-02-2)；宁夏青年科技人才托举工程项目(TJGC 2018081)；宁夏农林科学院科技创新先导项目(NKYJ-19-01)；宁夏自然科学基金项目(2019AAC03155)。