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１９９１～１９９３年在临汾市乔李村采用大田调查与小区试验相结合的４因素３水平正交法，研究晚播小麦高产的主要限制因素。结果，４种限制因素的效应次序为：施氮时期及比例＞施纯氮肥量＞基本苗＞播期。３年大田调查，晚播小麦在合理施肥的条件下，亩产仍可达到５００ｋｇ。因此，晚播小麦高产的主要限制因素是施氮时期及比例，而不是冬前积温。
From 1991 to 1993, Qiao Li Village, Linfen City, using the 4 factors and 3 levels orthogonal method combining field investigation and plot experiment, studied the main limiting factors of late sowing wheat high yield. Results, the order of the four kinds of limiting factors: nitrogen application period and the proportion> application of nitrogen fertilizer> basic seed> sowing date. 3-year field investigation, late-sowing wheat in a reasonable fertilization conditions, the mu can still reach 500kg. Therefore, the main limiting factor for late sowing wheat high yield is the nitrogen application period and its proportion, rather than the accumulated temperature before winter.