为了促进甘肃中部地区小麦产业绿色可持续发展，选育丰产稳产优质春小麦新品种，是当地小麦产业提质增效的关键举措。定丰 21号为定西市农业科学研究院培育的优质春小麦新品系，该品种选用自主培育品系 W-14为母本、引入外地优良品种 CMS579-1为父本开展有性杂交，然后通过系谱法历经多年选育而成。以陇春 23号为对照品种， 2020 — 2021年甘肃省东片水地春小麦区域试验中，定丰 21号的平均折合产量为 5 760.00 kg/hm2，增产 9.43%；2022年生产试验中，定丰 21号的平均折合产量为 5 596.50 kg/hm2，增产 10.35%。定丰 21号生育期 111 d，株高 92 cm，成穗数 464.3万穗 /hm2，穗粒数 41.5粒，千粒重 46.0 g。籽粒含粗蛋白(干基) 172 g/kg、湿面筋 291 g/kg，容重 784 g/L，面团稳定时间 6.3 min，吸水量 646 mL/kg，面团形成时间 5.9 min，延伸性230 mm，最大拉伸阻力 518 E.U，能量 161 cm2。在甘肃省中部水地春麦区及类似生态环境区适宜种植。

To promote the green and sustainable development of the wheat industry in the central region of Gansu Province,breeding new spring wheat varieties with high yield, stable productivity, and superior quality is a key measure for improving qualityand efficiency in the local wheat industry. Dingfeng 21, a new variety of spring wheat, was developed by Dingxi Academy of Agricultur.al Sciences through sexual hybridization with the self-bred line W-14 as the female parent and the introduced elite variety CMS579-1 as the male parent, followed by pedigree selection. In the 2020 to 2021 regional experiment of spring wheat in the eastern irrigatedareas of Gansu Province, the average equivalent yield of Dingfeng 21 was 5 760.00 kg/ha, representing a yield increase of 9.43%. Inthe 2022 production experiment, its average equivalent yield was 5 596.50 kg/ha, representing a yield increase of 10.35%. Dingfeng21 has a growth period of 111 days, a plant height of 92 cm, a spike number of 4.643 million/ha, an average of 41.5 grains per spike,and a thousand-grain weight of 46.0 g. The grain contains 172 g/kg of crude protein (on a dry basis), 291 g/kg of wet gluten, a bulkdensity of 784 g/L, a stability time of 6.3 min, a water absorption capacity of 646 mL/kg, a dough development time of 5.9 min, an ex.tensibility distance of 230 mm, a maximum resistance to extension of 518 E.U, and an energy value of 161 cm2. It is suitable for cultiva. tion in the irrigated spring wheat areas in the central region of Gansu Province and regions with similar ecological conditions.

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甘肃省重大科技专项( 25ZDNA001)；甘肃省乡村振兴专项( 25CXNJ018)；定西市科技计划( DX2025AYN011)。