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１９９１～１９９５年研究了陇东旱原冬小麦玉米组合系统的增产增收、土壤水分利用、组合耗水量及补偿供水效应。结果表明：（１）小麦玉米组合系统具有增产增收和水资源集约利用的优势，土地当量比，收益当量比分别达到１．２１５、１．１９９。（２）在组合系统中，冬小麦边行优势总值达到９４．９％～１４４．５％，其补偿率为１８．９０％～２８．９９％。（３）冬小麦对土壤水分的竞争利用是玉米带土壤水分不足的主要原因，系统组合耗水量明显小于小麦、玉米单作耗水量的累加值，水分缺额１１０．２～１５３．８ｍｍ。（４）玉米根际补偿供水具有明显的增产效果，但供水效应不同降水年型之间差异较大
From 1991 to 1995, the yield and income of winter wheat and maize combination system in Longdong arid region, soil water use, combined water consumption and water supply were studied. The results showed that: (1) The wheat-maize combination system has the advantages of increased yield and intensive utilization of water resources. The land equivalent ratio and yield-equivalent ratio reached 1.215 and 1.199 respectively. (2) In the combined system, the total value of edge advantage of winter wheat reached 94.9% ~ 144.5%, and its compensation rate was 18.90% -28.99%. (3) The competition of winter wheat for soil moisture is the main reason for soil moisture shortage in corn belt. The water consumption of system combination is obviously less than that of wheat and corn. The water deficit is 110.2-153.8 mm. (4) The corn rhizosphere compensation water supply has a significant yield increase effect, but the water supply effect varies greatly between different precipitation years