根层水肥调控对盆栽玉米生长效果的研究

采用盆栽试验,研究了不同水肥调控措施对玉米生长、根系分布及植株氮、磷、钾养分的影响。结果表明,与常规灌溉施肥处理相比,滴灌深施处理能显著提高10cm以下土层的总根长和根表面积;在试验条件下,不同处理对玉米地上、地下部含磷量影响差异不显著,在玉米生长后期对地上部氮及地上、地下部含钾量的影响差异显著,表现为常规灌溉施肥处理要显著低于土壤表层滴灌施肥、土壤深层滴灌施肥处理。玉米在3个取样时期的生物量均表现为土壤表层滴灌施肥、土壤深层滴灌施肥处理显著高于常规灌溉施肥处理,其增长率达59.0%～75.3%、30.0%～32.5%和13.6%～16.5%。

Effects of Various Water and Fertilizer Controlling Measures in Root Zone on Growth of Maize

Water and fertilizer are main factors influencing crop growth,yield and ecological environment.A pot experiment was carried out to study the effects of various water and fertilizer controlling measures on growth,root distribution and N,P and K contents in the plants of maize.The results showed that compared with conventional irrigation and fertilization,subsurface fertigation could significantly promote total root length and root surface for the root layer below 10 cm.There were no significant difference in phosphorus content of maize between three treatments while nitrogen and potassium of subsurface fertigation and surface fertigation were significantly higher than that in conventional irrigation and fertilization.Compared with conventional fertilization and irrigation,subsurface fertigation and surface fertigation in three sampling stage could significantly increase the biomass of maize by 59.0%~75.3%,30.0%~32.5% and 13.6%~16.5% respectively.