论文部分内容阅读
甘薯地膜复盖,栽培裸地栽培相比可提高土壤积温400℃左右,相当延长生育期15—20天。可保持土壤水分,增加土壤孔隙度0.2—3.1%(0～20厘米土层),降低土壤容重0.01～0.09克/立方厘米(0—20厘米上层);加速有机物矿化,增加土壤可溶性养分,据大连市农科所测定可增加全磷4.37%、全钾7.57%,水解氮5.19%、速效磷0.91%和速效钾2.95%;改变地表小气候,增加光反射率,提高地表气温和加速空气流通;促进土壤微生物活动,增加土壤微生物总量23.～37.6%,促进有机质及潜在腐殖质分解,加速
Compared with the cultivation of bare land, cultivation of sweet potato can increase the accumulated soil temperature by about 400 ℃ and prolong the growth period by 15-20 days. Maintain the soil moisture, increase the soil porosity of 0.2-3.1% (0 ~ 20 cm soil layer), reduce the soil bulk density of 0.01 ~ 0.09 g / cm (0-20 cm upper layer); accelerate the mineralization, increase soil soluble nutrients, According to Dalian Agricultural Science Institute, it can increase 4.37% of total phosphorus, 7.57% of total potassium, 5.19% of hydrolyzed nitrogen, 0.91% of available phosphorus and 2.95% of available potassium; change surface microclimate, increase light reflectance, increase surface temperature and accelerate air circulation ; Promote soil microbial activities, increase the total amount of soil microorganisms 23. ~ 37.6%, promote the decomposition of organic matter and potential humus, accelerate