1.趁墒早播抓全苗 (1)增强抗逆性:早播的幼苗,可以在低温和干旱的环境中经过锻炼,使得地上部分生长缓慢,根系发达,茎粗叶茂节间短,起到蹲苗作用,从而增强耐寒抗旱、抗倒的能力,如在-2～-3℃的低温,即可受害,但经一周以后仍可恢复正常生长。 (2)减轻病害:由于播种早、温度低,不利于黑粉病孢子的发芽,所以还有减轻病害的作用。实践证明,适时早播是获得全苗的有效措施。播种太早太迟都对制 1. Taking advantage of pre-sowing sowing whole seedlings (1) to enhance the resistance: Early sowing of seedlings, can be in cold and arid environment after exercise, making the growth of the ground part of the slow, developed roots, stems and leafy short joints, play Squatting seedlings role, thereby enhancing cold tolerance, anti-down ability, such as -2 ~ -3 ℃ low temperature, you can suffer, but after a week can still resume normal growth. (2) to reduce disease: As sowing early, low temperature, is not conducive to the sprouting of melanosome spores, so there is the role of reducing disease. Practice has proved that timely sowing is an effective measure to obtain full seedlings. Sowing too early too late on the system