賈信榮
摘要 用赤霉素在頭季稻齊穗后、頭季稻收割后各個不同時期噴施和在再生稻始穗期不同時段噴施,研究其促芽促苗及增產效果。結果表明:施用赤霉素都有一定的促芽促苗效果和增產效果。以頭季稻齊穗后30 d噴施、頭季稻割后5 d噴施和再生苗抽穗10%~50%時噴施的綜合效果較好。
關鍵詞 赤霉素;再生稻;催芽促苗;產量效應
中圖分類號 S482.8 文獻標識碼 A 文章編號 1007-5739(2015)14-0124-02
Effects of GA Sprayed at Different Stages on Yield and Shoots of Ratoon Rice
JIA Xin-rong
(Agricultural Technology Promotion Stations of Hongshui Town in Rongshui County of Guangxi Zhuang Antonomous Region,Rongshui Guangxi 545321)
Abstract Through spraying GA at different stages after heading,after harvest of first season rice and before heading of ratoon rice,the effects of its promoting seedling,germination and increasing yield were studied.The results showed that GA administration had a certain effect on promoting seedling,germination and increasing yield. Among them,it had good effects that spraying GA at 30d after heading,5d after harvest of first season rice and heading 10% to 50% of ratoon rice.
Key words GA;ratoon rice;promote seedling and germination;yield effects
中稻蓄留的再生稻,具有生長周期短、省工、省秧田、省肥、一種兩收、經濟效益好等優點,是中稻地區充分利用溫光水資源,提高稻田復種指數、增加稻谷產量的有效途徑之一[1-3]。紅水鄉地處桂北山區融水縣東北部,在當地種植水稻,光溫資源兩季不足而一季有余。因此,因地制宜全面推廣再生稻種植是提高該鄉糧食自給率、解決群眾溫飽問題和確保糧食安全的主要措施。紅水鄉在20世紀90年代中期就已經示范再生稻種植,但稻谷產量多年來徘徊在2 250 kg/hm2左右,產量低和效益差很大程度上影響了當地群眾的生產積極性。再生稻產量低的原因:一是頭季稻稻樁的休眠芽萌發率低,成苗數少,有效穗不足;二是再生稻抽穗不夠整齊,包頸現象多,結實率較低[4-5]。為了提高再生稻的產量,在縣農業技術推廣站的指導下,筆者于2014年利用植物生長調節劑——赤霉素(俗稱“九二○”)對頭季稻及再生稻不同時期進行噴施,旨在探索其對再生稻的生長和增產效應,進一步完善本地再生稻栽培技術,提高高寒山區稻谷產量,并推而廣之。……