Gibberellin applied to the rice main crop increases ratoon-crop yield.
Gibberellin applied to the rice main crop increases ratoon-crop yield.
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DOI：
10.1094/cm-2007-0417-01-rs
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Tarpley, L.
中科院分区：
文献类型：
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作者：
Rounds, E. W.;Mohammed, A. R.;Tarpley, L.
再生稻(Oryza sativa L.)指从主要作物收获后的再生中获得的第二种作物。再生作物在美国水稻生产系统中正受到越来越多的关注，这是因为具有良好再生产量潜力的早熟基因型越来越普遍，以及生产者面临的最大化季节性产量的经济压力。2002年至2005年进行了田间试验，以评价赤霉素(GA)在头季稻上应用对再生稻产量的影响。在主要作物开花后3d至软面团期间，赤霉素的施用量为10g ai/ha。不同的品种在德克萨斯州两个地点的田间研究小区进行了试验。使用中位数的配对t检验对数据进行分析，以评估GA处理的小区与未处理的小区的比较。主要作物产量不受GA影响，再生作物产量比对照增加264 kg/ha。在17项研究中，有14项研究的再生作物产量在GA处理的地块比未处理的地块高。极早熟强势杂交种对GA处理反应强烈，GA处理可使宿根产量平均增加697 kg/ha。GA处理略微延缓了主要作物的发育。
Ratoon rice (Oryza sativa L.) refers to the second crop made from the regrowth following main-crop harvest. The ratoon crop is receiving increasing attention in US rice production systems due to the increasing prevalence of early-maturing genotypes with good ratoon-yield potential, and the economic pressure on producers to maximize seasonal yields. Field studies were conducted in 2002 through 2005 to evaluate the influence of gibberellin (GA) applied to the main crop on ratoon-rice yields. Gibberellin at 10 g ai/ha was applied when the main-crop was between 3 days post-flowering and soft-dough. Various cultivars were tested in field research plots at two locations in Texas. The data were analyzed using a paired t-test of medians to evaluate GA-treated plots compared to nontreated plots. Main-crop yields were not influenced by application of GA, while ratoon-crop yields were increased 264 kg/ha by the GA application. Ratoon-crop yields were higher in GA-treated plots vs. nontreated plots in 14 of 17 studies. The very early-maturing vigorous hybrids responded strongly to GA treatment, with average increases in ratoon yield due to the GA treatment of 697 kg/ha. The GA treatment slightly delayed main-crop development.