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上海县种子公司近年来不断总结杂交粳稻寒优湘晴(寒丰A×湘睛4144)的制种栽培技术,有所提高,有所创新,不断完善。该县1990年制种1648亩,平均亩产158.4公斤;1991年制种2901亩,平均亩产156.4公斤,其中150亩高产田,平均亩严达235公斤。现将制种栽培技术介绍如下: 1 抓合理播种差期,确保花期相遇。在合理播种差期和栽培条件下,父母本花期基本相遇。母本掌握播种期5月23～25日,其始穗期为9月1～3日,齐穗期为9月5～8日。一期父本播种期相隔10～12天,即6月3～5日,其始穗期为8月31日至9月2日,齐穗期为9月3～6日。第二期父本播种期再间隔5～7天,这样能基本达到花期相遇的目的。在此前提
In recent years, the seed companies in Shanghai have continuously summed up the cultivation techniques of hybrid rice Han Youyouxiang (Hanfeng A × Xiang-je 4144), which has been improved, innovated and constantly improved. The county planted 1648 mu in 1990, with an average yield of 158.4 kilograms. In 1991, 29.01 mu of cultivated land was produced, with an average mu yield of 156.4 kilograms. Among them, 150 mu of high yield farmland had an average mu weight of 235 kilos. Seed cultivation techniques now introduced as follows: 1 grasping a reasonable sowing difference, to ensure flowering meet. In the reasonable sowing difference and cultivation conditions, the parents of the flowering basically meet. The mother to master the sowing date May 23 ~ 25, the beginning of the heading period for the September 1 to 3, heading for the September 5 to 8. The first son of the sowing interval of 10 to 12 days, that June 3 to 5, the beginning of the heading for the August 31 to September 2, heading for the September 3 to 6. The second period of sowing of the second interval 5 to 7 days, so that the basic purpose of meeting the flowering. In this premise