Effects of soil root-growing space on root physiological characteristics and grain yield of sorghum
采用尼龙袋（允许水分和养分自由通过）装土栽培作物的方法，研究了根系生长空间对高粱根系生理特性及产量的影响.结果表明，限制根系生长空间影响了高粱的生长，不同程度地降低了高粱的株高、叶面积、花后旗叶SOD及POD活性、总根长、根系吸收面积、根系与地上部干重、养分吸收量及最终产量，但增加了根系活力及活性吸收面积占总吸收面积的百分数.施肥有利于改善高粱根系在空间胁迫下的生长，增加根系吸收面积和活力，促进根系对养分的吸收，在一定程度上延缓根系生长空间不足所造成的不良影响.
In this paper,soil culture was conducted on the Experimental Farm of Shanxi Agricultural University,with the sorghum planted in cylindrical nylon bags to confine the space of root growth but allow the passthrough of water and nutrients,aimed to study the effects of soil rootgrowing space on the root physiological characteristics and grain yield of sorghum.The results showed that the confinement of root growth space decreased the plant height,leaf area,SOD and POD activities in flag leaf,total root length,root absorbing area,dry weights of root and aboveground part,nutrient uptake and grain yield,but increased the activity of root and its active absorbing area.Fertilization stimulated the root growth under space stress,increased the activity of root and its absorbing area,promoted nutrient uptake,and thus,increased grain yield while decreased the detrimental effects derived from the confine of root growth space.
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