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1990年承德地区春玉米与春小麦间作面积8.4万亩,平均亩产达717.8公斤,比单一种植玉米亩增产210.8公斤,增产41.6％。我们与平泉、滦平和隆化县农业技术推广中心在基点上搞的125亩示范吨粮田,混合亩产达到1014公斤,其中小麦286公斤,玉米728公斤。一、适宜栽培区与增产机理根据我区的几年试验示范实践,春玉米与春小麦吨粮田栽培适宜区应具备无霜期120～150天,大于或等于10℃活动积温600～3400℃。其增产机理: (一)充分合理利用光热资源,增加光合产物在适宜区春小麦播种是在土壤5厘米深地温达到2～4℃时进行的,一般在3月10～20日。比1年1作大田正常播种提前1个月,也就是说可充分利用当地大于或等于零度的积温240℃以上。玉米是C_4作物,有
In 1990, the inter-working area of spring maize and spring wheat in Chengde was 84,000 mu, with an average yield of 717.8 kg per mu, 210.8 kg more than that of monoculture corn, an increase of 41.6%. We and Pingquan, Luanping and Longhua Agricultural Technology Promotion Center in the base point of engaging in 125 acres of demonstration tons of grain, mixed acres yield reached 1014 kilograms, of which 286 kilograms of wheat, corn 728 kilograms. I. Suitable Cultivation Area and Yield Mechanism According to the experimental and demonstration practice in our area for several years, the appropriate area for spring corn and spring wheat for grain crop cultivation should have a frost-free period of 120 to 150 days and an active accumulated temperature of 600 to 3400 ° C greater than or equal to 10 ° C. The yield-increasing mechanism: (A) full and rational use of light and heat resources to increase photosynthetic products in the appropriate area Spring wheat sowing is 5 cm deep in the soil temperature reached 2 ~ 4 ℃ when, usually in March 10 to 20. Than 1 year 1 for the normal sowing Daejeon 1 month in advance, that is to make full use of the local temperature greater than or equal to zero above 240 ℃. Corn is a C_4 crop, there