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张掖市绿洲灌区 1999年农田耕层土壤养分平均含量为有机质 18.44± 0 .6 8g/kg、全氮 1.13± 0 .0 4g/kg、速效磷 2 2 .7± 2 .2 1m g/kg、速效钾 2 44± 18mg/kg、碱解氮 76 .6 0± 3.0 3mg/kg,其含量较 1986年和 1990年测定结果都有较大或大幅度的提高 ;土壤有效锌和锰含量分别处于低或很低水平 ,其含量变化为前者随测定时间呈递增规律 ,而后者则反之。相关与回归分析结果表明 ,土壤有机质含量是决定土壤养分贮量和供应水平的主要因素 ,因此增施有机肥料是该市用地与养地相结合的主导措施
The average contents of soil nutrients in farmland in 1999 were 18.44 ± 0.68g / kg for organic matter, 1.13 ± 0.40g / kg for total nitrogen, 27.7 ± 2.21m g / kg for available phosphorus, Available potassium2 44 ± 18mg / kg, alkaline hydrolysis of nitrogen 76.6 ± 3.03mg / kg, compared with 1986 and 1990, the determination of the results have greater or substantially increased; soil available zinc and manganese were in Low or very low level, its content changes as the former with the determination of the law was increasing, while the latter is the opposite. Correlation and regression analysis showed that soil organic matter content is the main factor that determines soil nutrient storage and supply level, so increasing organic fertilizer is the dominant measure of the combination of land use and conservation in this city