1.错期播种保证花期相遇 父本分两次播种。一期父本与母本同时播种,待母本钻锥时播二期父本。虽然一期父本与母本同时发芽、出苗,但是花期较母本早,中后期花粉正好与母本花期相遇;二期父本花粉可以弥补第一期父本花之不足。花粉量充足,相遇时机洽当,减少了外来花粉的天然杂交机会。无论是母本雌花花丝还是父本花粉,其生活力均处于旺盛时期,授粉结实率均很高,不会因气候条件异常而影响花期相遇。在沈阳地区多采用这种做法。 1. The wrong time to sow to ensure that the flowering parents were divided into two sowing. A paternity and mother at the same time sowing, until the mother drill cone when sow two patriarchs. Although the male parent and the female parent at the same time germinated and sprouted at the same time, the flowering period was earlier than the female parent and the pollen at the middle and late stage met the female parental flowering stage. The second-stage male pollen could make up for the lack of the first-stage male parental flower. Adequate amount of pollen, met when the opportunity to meet, reducing the opportunities for natural hybrid foreign pollen. Whether the female parent flower filigree or paternal pollen, its vitality are in a period of exuberance, pollination rate are high, not due to abnormal weather conditions affect the flowering encounter. In Shenyang more use of this approach.