关键词: 陕北, 陕北, 长城沿线风沙区, 土地资源, 人口承载力

Abstract: Abstract：In the same nitrogen and phosphorus fertilizer level condition, efficiency of fertilizer utilization in roots, stem and leaves with different fertilizer response and effect of different potassium fertilizer consumption on flue-cured tobacco growth was studied by field experiment. The results showed that leaf area index and dry matter accumulation in the aerial parts of the plant was effected largely by low potassium consumption but the effect by high potassium consumption was small. The dry matter accumulation total of low potassium consumption was higher significantly than control, however that of high potassium consumption was no significant different with the control. The efficiency of potassium fertilizer utilization of the aerial part was 20d<40d<60d. The efficiency of potassium fertilizer utilization of 20d and 40d was significant correlation with potassium consumption in exponent functional pattern. That of 60d was middle correlation with potassium consumption. The efficiency of potassium fertilizer utilization of roots was 20d<40d<60d<80d<100d. The efficiency of potassium fertilizer utilization of 20d roots was significant extremely correlation with potassium consumption in cubic curve pattern, that of 40d was high correlation in quadratic curve pattern, that of 60d and 100d was significant extremely correlation in exponent functional pattern and that of 80d was middle correlation in exponent functional pattern.