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一、试验方法 1978-1980年在平陆县城关、王崖农场沙壤水地试验,地力中上等。5月15日小麦收获前21天套种玉米,间隔3行小麦套一行玉米,行距2.1尺,株距9.5寸,每亩3,000株。供试玉米品种为运单1号。6月6日小麦收获后,随即灭茬,每亩普追碳铵50斤(折合硝铵26斤,占全生育期追肥量的40％),追后浇水。此时玉米株高15厘米,正处于五叶一心期。之后试验分四个处理:
First, the test method 1978 to 1980 in Pinglu County Chengguan, Wang cliff farm sand soil water test, ground force in the finest. May 15 wheat 21 days before harvest interplanted corn, spacing 3 rows of wheat line of corn, spacing 2.1 feet, spacing 9.5 inches, 3,000 acres per acre. Test corn varieties for the first single. June 6 wheat harvest, then stubble, per acre common chalcoction 50 kg (equivalent to 26 kg of ammonium nitrate, accounting for 40% of the entire growth period dressing) chase after watering. At this point corn plant height of 15 cm, is in a five-leaf one heart. After the experiment divided into four treatment: