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对三系杂交晚稻新组合H优518制种技术进行研究与实践表明:该组合在山区适宜夏制,在平原、丘陵区适宜春制、秋制,在海南冬制。春制父母本播种时差48 d左右,叶差10叶;夏制时差37 d左右,叶差9.5叶;秋制时差35～37 d;海南冬制时差40d,叶差9.0～9.5叶。父母本行比为2∶(14～16),母本移栽规格为13.3 cm×13.3 cm,父本移栽规格为25.0 cm×13.3 cm。制种田以底肥为主,N、P、K比例为1.0∶0.6∶1.2。“九二○”总用量120 g/hm2以内,第1次喷施时母本见穗指标40%～50%。注重稻瘟病和黑粉病防治。
The research and practice on the seed production technology of H You 518, a new three-line late hybrid rice combination, showed that the combination was suitable for summer crop in mountainous area and suitable for spring and autumn in plain and hilly area and winter in Hainan. Parents of the parents of this sowing time of about 48 d, leaf difference of 10 leaves; summer time difference of about 37 d, leaves 9.5 leaves; autumn time difference of 35 ~ 37 d; Hainan winter time difference of 40 d, leaves 9.0 to 9.5 leaves. The ratio of parents to parents was 2:14 (14-16). The female parent’s transplanted size was 13.3 cm × 13.3 cm. The male parent’s transplanted size was 25.0 cm × 13.3 cm. Farming based on basal fertilizer, N, P, K ratio of 1.0: 0.6: 1.2. “Nine two ” the total amount of 120 g / hm2 or less, the first spray when the mother see the ear index 40% to 50%. Focus on rice blast and powdery mildew prevention and treatment.