高温和干旱条件下马唐对早熟禾生长的影响

Effects of weed Digitaria on Poa turf under high temperature and drought conditions

本研究的目的是确立在高温和干旱环境中草坪除草的策略。结果表明 :草坪草早熟禾生长至(10± 1)cm时遭遇高温干旱 ,马唐生长高度无论低于或高于或相近于早熟禾 ,7d内生长高度增长继续 ,而植株的生长量 7d后下降。马唐高度高于早熟禾时 ,在马唐密度 10 0～ 2 0 0株 /m2 范围内 ,早熟禾生长高度增长的幅度大于其它密度范围 ,生长量降低的幅度低于其它密度范围 ,在马唐 15 0株 /m2 密度中的早熟禾降幅最低。总之 。

The strategies of Digitaria control in Poa turf under high temperature and drought conditions were carried out. The results showed that no matter what height of Digitaria was, when Poa height was 10cm under high temperature and drought conditions, Poa still kept growing within 7 days but the output decreased after 7 days. When the height of Poa was shorter than Digitaria which density range was 100～200 plant/m 2, the Poa height was increased twice than that in other Digitaria densities, but the Poa output decreased twice. Anyway, 150 plant/m 2 was suitable Digitaria density for Poa turf to grow. In summary, Digitaria was benefit to help Poa growing under certain unfavorable conditions.