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C704(C 型豫农704的简称)玉米杂交种,是由C 型二南24不育系与525恢复系配制而成的。使用这个杂交种可免除制种田的人工去雄,因此推广面积正在扩大。C 二南24不育系对525的反应为部分恢复,因此,杂种一代花粉量少。据我们观察,正常年份C704一代杂交种的恢复散粉株率为59.4—72.6%,不育株率为27.4—40.6%;干旱高温年份不育株率还要增加。由于 C704的这一特性,建议在栽培时应注意以下几点:
C704 (C-type Yuong 704 referred to) corn hybrids, by the C-two south 24 sterile line and 525 recovery system prepared. The use of this hybrid can eliminate the need for artificial dehumanization of farming systems and the area of extension is expanding. The response of C 2 South 24 CMS to 525 was partially recovered, therefore, the hybrid generation had less pollen. According to our observation, the rate of scattered powdery plants recovered from normal generation C704 hybrids was 59.4-72.6% and the rate of sterile plants was 27.4-40.6%. The rate of sterile plants in drought-high temperature years also increased. Due to this characteristic of C704, it is recommended to pay attention to the following points during cultivation: