郑谷四号是以新农724为母本,安革3号为父本杂交选育而成。经省内历年多点试验,示范和大面积种植,均表现为丰产性良好,粮草兼优的品种,肥地种植一般较对照种增产22.4—32.2%。1977年巩县向阳大队50亩夏谷平均单产734斤,1979年161亩平均单产607斤。英峪大队第二生产队10亩单产达804.5斤。该品种为中熟种,夏播生育期82—96天,出苗至抽穗45—52天,抽穗至成熟38—44天。全生育期要求积温2050—2470℃。如郑州、荥阳等地丰产田积温为2250—2450℃单产750斤左右,而林县东曲大队试验田积温为2050—2120℃,单产仅300—400斤。另外苗期生长缓慢,据在郑州观察,平均每生 Zheng Valley No. 4 is based on the new agricultural 724 as the female parent, No. 3 for the reform of the father of the hybrid breeding. After many years of experiments, demonstrations and large-area cultivation in the province, all showed good varieties with good yield and good forage and good yield, with 22.4-32.2% of increase in yield of fertilizers compared with the control. In 1977, the Xiangyang brigade in Gongxian County produced an average yield of 50 hectares of summer valley with 734 jins. In 1979, the average yield of 161 acres was 607 jin. Yingyu brigade second team 10 acres yield 804.5 pounds. The varieties are medium-maturing, summer sowing period of 82-96 days, emergence to heading 45-52 days, heading to mature 38-44 days. Whole growth period requires temperature 2050-2470 ℃. For example, in Zhengzhou and Shenyang, the accumulative temperature of the high yielding field is about 750 kg per hectare at 2250-2450 ℃, while the accumulated temperature of the experimental field of Linqu County’s East Quetta is 2050-2120 ℃, yielding only 300-400 jin. In addition, the seedling growth is slow, according to Zhengzhou observation, the average per student