摘要
免耕秸秆覆盖对玉米的根系数量和伸展范围有明显的影响,各生育阶段分布在土壤的根量,特别是土壤下层根含量明显多于传统耕作(对照)。苗期:根量比对照多18.5%,根下扎土壤深度比对照多20cm,土壤下层根含量占总根量的21.3%,对照则无下层根。孕穗期:根量超过对照49.1%,根下扎深度比对照多10cm,土壤下层根含量比对照多7.9个百分点。开花期:根量超过对照38.3%,根下扎深度比对照多20cm,土壤下层根含量比对照多8.7个百分点。灌浆期:根量超过对照32.9%,下层根含量比对照多9.1个百分点。另外,根体积、伤流量等都超过对照。
The cultivation untilled and covered with the whole plant stalk has more obviously affection on quantities and stretch range of maize roots than traditional cultural methods.On each stage of de- velopment,the root quantities distributed in soil all overtake the checks,especially those distributed in underlayer soil.At seedling stage,root quantities untilled and covered with stalks are more 18.5% than checks,the underground depth into which roots grow is more than 20cm than checks,and root quantities in the underlayer take 21.3% of total root quantities in contrast with 0% of checks.At booting stage,the total root quantities are more 49.1%,root depth more 10cm and underlayer root quantities more.7.9%.At flowering stage,those are more 38.3%,20cm and 8.7% respectively. During filling period,total and underlayer root quantities are more 32.9% and 9.1%。Moreover, root volume,root density and wound flow all overtake checks.
出处
《山西农业科学》
1993年第1期14-18,共5页
Journal of Shanxi Agricultural Sciences