Abies gracilis Kom.(Pinaceae) is one of the rarest and endangered conifers in the Russian flora,which must be cultivated......

为探索新研制的9系生物刺激素对玉米产量和品质的影响,开展了田间小区试验。试验共设2个处理,以不喷洒9系生物刺激素的处理为对照,......