盐城市的杂交水稻制种,自1983年大面积(4万多亩)平均亩产超200斤以来,产量逐年上升,质量稳步提高。1984年制种2.7万多亩,单产243.8斤,平均纯度达98％以上。1985年制种3.3万多亩,亩产285.1斤,其中特约专业制种基地建湖县庆丰乡和郊区楼王乡共制种1.2万多亩,平均亩产304斤,田间纯度在99.9％以上。这几年的大面积制种取得较高的产量和质量,主要抓了以下几条措施: (一)合理安排播期,保证花期相遇和正常开花 Yancheng hybrid rice seed production since 1983, a large area (40,000 mu) over 200 pounds per mu average yield has been rising year by year, the quality has improved steadily. 1984 planted 27,000 mu, yield 243.8 kg, the average purity of more than 98%. In 1985, 33,000 mu of seed were planted and 285.1 kg of mu per mu were produced. Among them, Qingfeng Township of Jianhu County and Wangliang Township of Suburbs, a special specialty seed-producing base, produced 12,000 mu, with an average yield of 304 kg per mu and field purity of 99.9% the above. In recent years, large-scale seed production achieved higher yield and quality, the main catch the following measures: (A) a reasonable arrangement of sowing date, to ensure the flowering meet and flowering normally