不同施肥水平下黍子根系对干旱胁迫的生物学响应研究表明，无论施肥与否，拔节期或抽穗期干旱胁迫均会使黍子根重、根长、根活力、次生根数、根系SOD活性及株高与地上部干重明显降低，MDA含量明显增高；水分胁迫解除后，黍子根系增长迅速，表现出明显的补偿效应和根系对水分反应敏感的特点，但干旱造成的不利影响在后期未能完全补偿。抽穗期干旱胁迫对黍子的影响大于拔节期，这是由于拔节期胁迫后恢复水分供应，根系有较长的时间与空间进行补偿的结果。通过施肥改善土壤肥力，可以肥促根、以肥调水、提高土壤水分利用效率和增加产量，在一定程度上缓解干旱胁迫的影响。
The pot-experiment was conducted on the Experimental Farm of Shanxi Agricultural University. The results indicated that the content of MDA and root-shoot ratio were increased, but the dry weight of root, total root length, secondary root number, root activity, the SOD activity of root, the height of plant and aboveground dry weight of broomcorn millet decreased significantly with drought treatment regardless of fertilizing or not. After the drought treatment plant was rehydrated and root weight accumulated rapidly, indicating that root system was move sensitive to the change of soil environment than the aboveground part. However, no matter how rapidly the weight of root accumulated after drought released, the dry weight increment could not compensated that of the decreasing during the period of drought treatment. Rewatering after drought during jointing stage had more compensatory effects than that during booting stage because of more time space for the former. The booting stage of broomcorn millet was sensitive to water deficiency. The growth, the yield, the water use efficiency and drought resistance of broomcorn millet were enhanced by the application of fertilizer and FA
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