Increase hybrid rice seed production
隐藏域元素占位
Increase hybrid rice seed production
Application of regulators to increase hybrid rice seed production
Paclobutrazol
Spraying paclobutrazol in hybrid rice seed production has a good effect on preventing germination on ears. Spraying 750 g/hm2 of paclobutrazol at about 15d after full heading can not only significantly reduce the bud and valley rate, but also improve the seed setting rate and increase the yield.
Gibberellic acid
The physiological characteristics of the female parent (sterile line) in the seed production field are serious. After spraying gibberellic acid, the stigma exposure rate can reach about 95%, and the angle of the flag leaf is significantly increased, which is 18%~20% larger than that of the control. The leaf layer is obviously pushed out, thereby increasing the probability of pollination.Therefore, gibberellic acid has the functions of solving the necking, regulating the ratio of the parent plant height and the probability of meeting at the flowering stage, and can improve the seed setting rate and yield of seed production. According to the determination of "Shanyou 64" hybrid combination in Zhejiang Province, using 5g of 85% gibberellic acid per mu, the necking rate is 29.3%~31.39% less than the control, the seed setting rate is increased by 16.7%~19.8%, and the yield is increased by 63.9%~91.3% %.
Generally, it is sprayed for 2~3 times in a row. The first spray is when the female parent is heading 5%~10%, and the active ingredient of gibberellic acid is 1~2g per mu; the second time is 3~4g; the third time depends on the mother parent. Depends on the degree of neck elongation. Generally, the total amount of 3 times is 12~16g.
Attention should be paid to the use, strictly control the first spraying period, and it is not ideal to solve the neck of the female parent too early or too late, and at the same time, it is necessary to strictly control the dosage per mu. The plant height ratio of the parental parent should be coordinated (the male parent should be slightly higher than the female parent) to improve the probability of pollination, and other considerations are the same as those of conventional rice.
Triacontanol and Gibberellic Acid
Using a mixture of triacontanol and gibberellic acid in hybrid rice seed production, the yield increase effect is more obvious than that of gibberellic acid alone, which is beneficial to improve the yield increase effect of gibberellic acid.Triacontanol also improves the photosynthetic phosphorylation of rice, increases the utilization rate of light energy, increases the proportion of the female parent before noon, and promotes the meeting of the parent and the female parent during the flowering period. The two have different effects, but the purpose is the same. A synergistic effect is produced, so that the seed setting rate and yield are significantly improved compared with the individual spraying.The rice "Zhenshan 97 A" was sprayed with 0.5 mg/L triacontanol and 25 mg/L gibberellic acid at the head-starting stage of the female parent. about.
Triazolone and Gibberellic Acid
Before heading, foliar spraying of gibberellic acid, triazolone, KH2 PO4, etc., can effectively prevent the degradation of spikelets, strengthen the culm and panicle, prolong the functional period of leaves, increase the seed setting rate, increase the grain weight, and significantly increase the yield. Among them, spraying 10 mg/L gibberellic acid + 300 mg/L triazolone + 200 mg/L KH2 PO4 increased the production most significantly.
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