“申优一号”制种在苏州市已有5年,制种亩产一般为125～150kg。2000年由于天气适宜,340亩制种田平均亩产达161.3kg。但“申优一号”制种在花期相遇上,常因土质、施肥及栽培措施等差异,而导致花期不遇,故要采取相应对策。1 造成花期不遇常发生的几个问题1.1 父母本播差期安排不当 “申优一号”制种父母本播期:父本播两期,5月10日播第一期、5月17日播第二期。母本播种一期,为5月20日。父母本播差期为7～10天,这是本组经试验确定的日期,必 “Shenyou 1” seed production in Suzhou City for 5 years, seed production per mu is generally 125 ~ 150kg. Due to the suitable weather in 2000, the average yield per mu of 340 mu farming system reached 161.3 kg. However, “Shenyou 1” in the flowering season to meet, often due to soil, fertilization and cultivation measures such as differences, resulting in flowering does not meet, it is necessary to take appropriate measures. 1 caused the flowering does not often occur a few problems 1.1 Parents sowed poor scheduling improper “shenyou 1” sowing parents sowing date: siblings broadcast two, sowing on May 10 the first period, May 17 Broadcast the second issue. Female parent sowing for May 20. Parents broadcast sowing period of 7 to 10 days, this is the group determined by the test date, must