| 摘要: |
| 为了探明寒区玉米大垄双行直播种植方法适合的种植密度和增产机制，试验以小垄为对照，通过测定土壤温度、土壤水分、玉米群体内光照强度及玉米产量性状等指标，研究了3个密度下玉米大垄双行直播种植效果。结果表明：大垄双行处理对土壤温度没有显著影响，但增加了0～20 cm土层的土壤水分含量；大垄双行减少了垄沟顶层叶片的光照截获，高密度处理（6.00 万株·hm-2）底层（出地表1/3）仍然保持一定的光照强度（72.5 μmol·m-2·s-1），减少了空秆率，在乳熟期单位面积干物质重显著增加；2008年大垄双行高密度处理（S3）产量为9 193.5 kg·hm-2，较对照（CK3）增产911.3 kg·hm-2。大垄双行直播种植方法增产机制主要是通过增加土壤湿度和调控群体内部光照强度影响产量。 |
| 关键词: 大垄双行 玉米 产量 光照强度 |
| DOI： |
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| 基金项目:国家“十二五”科技支撑计划项目(2012BAD20B04) |
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| Effects of wide ridge and double row planting of maize in cold regions |
| HAN Yi-qiang1, GAO Ya-mei1, ZHENG Dian-feng2, DU Ji-dao2 |
| () |
| Abstract: |
| To explore the mechanism of yield improvement and proper density of maize under wide ridge and double row cropping, an experiment was conducted with three planting densities by using narrow ridge cropping as the control, and soil temperature, soil moisture, illumination intensity and yield
traits were measured. The results showed that wide ridge and double row cropping had little effect on soil temperature, but increased soil moisture in 0～20 cm layer. Under the condition of wide ridge and double row cropping, the light capture of top leaves in furrow decreased, and the bottom layer of plants (1/3 above ground) remained certain illumination intensity (72.5 μmol·m-2·s
-1) in the treatment of high planting density (60 000 plants·hm-2), which contributed to decrease rate of barren stalk and to increase dry weight obviously at milky maturity stage. The yield of wide ridge and double row cropping with high planting density (S3) was 9 193.5 kg·hm-2 in 2008, being 911.3 kg·hm-2 higher than the control (CK3). Wide ridge and double row cropping affected yield mainly by increasing soil moisture and regulating illumination intensity among maize population. |
| Key words: wide ridge and double row maize yield illumination intensity |
