玉米培土得当,能起到防止倒伏,便于灌溉与排水,减轻草害和提高肥效等作用,达到增产的目的。如果培土过早过深,则适得其反。据调查,玉米高产单位涟水县大元大队,在玉米开始拔节时,培土5—6寸深,到玉米蜡熟期植株表现早衰倒伏。籽粒灌浆不足,千粒重下降,与对照(不培土)的相比,减产32%。原因分析:1.由于土质较粘,培土后造成通气不良,又易受茎腐病感染,一般染病率高达75%。 Maize soil properly, can play to prevent lodging, easy irrigation and drainage, reduce grass damage and improve fertilizer efficiency and other effects, to achieve the purpose of increasing production. If the soil too early too early, then counterproductive. According to the survey, the large-yield unit of Lianshui County, a unit of high-yielding corn, took 5-6-inch deep soil when the corn started to join the plant and showed early premature aging in the waxy corn stage. Inadequate grain filling, grain weight decreased, compared with the control (no soil), a reduction of 32%. Analysis: 1. As the soil is sticky, resulting in poor aeration after cultivation, but also susceptible to stalk rot infection, the general incidence of up to 75%.