【摘要】 采用根箱法，在人工气候箱和自然条件下，分别研究了隔水层对土壤水分和谷子、冬小麦根系通过提水作用利用下层水分对上层土壤中肥料的增产效应。结果表明，在同一生长条件下，隔水层可明显增加下层土壤贮水量，谷子能利用下层土壤水分增加上层土壤氮磷钾肥料的肥效，明显增加肥料的增产率。土壤剖面设置隔水层虽有保墒贮水的功能，但其对作物生物学产量的效应还有必要深入研究，以探索出既保墒又高产的旱地农业水肥管理技术。更多还原

【Abstract】 Both effects of 2cm perlite layer in soil profile at 20 cm on soil water content and thesoil water from hydraulic lift (use of deep soil water)of millet and winter wheat on soil nuthentbioavailability(mass yield of above ground parts)were studied under growth chamb condition(millet)and nature condition (winter wheat).The condition in the growth chamb is 26℃(day)and l6℃(night),60% relative humidity, and 450μEm-2S-1 photo flux density day (12hour)and night (12 hour).The result shows that the perlite layer set in the soil profile can sig-nificantly increase the soil water content below the layer compared to the treatment without theperlite layer under the same conditions。The millet was able to utilize the water in the soil belowthe perlite layer to increase the mass yieud aboveground parts by promoting the N,P and K fertil-izer efficiency.Although it was capable of increasing soil water content below the perlite layer toput the layers in the soil profile,the layer affects the biomass yield aboveground.Therefore,it isnecessary to find a way to keep soil water and increase crop yield at practice in agriculture.更多还原