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对甘肃省庆阳市结果 3、6、9、12、15年的苹果园土壤养分含量进行了测定。结果表明:随苹果园结果年限的增加,土壤有机质和全氮含量0~30 cm和30~60 cm土层逐年降低;速效氮含量呈上升的趋势,0~30 cm土层速效氮含量平均每年增加0.998 mg/kg,30~60 cm土层速效氮含量平均每年增加0.655 mg/kg,但结果 6年后,变化相对缓慢。全磷含量逐年增加,0~30 cm土层平均每年增加0.037 g/kg,30~60 cm土层平均每年增加0.028 g/kg;有效磷含量呈上升的趋势,0~30 cm土层有效磷含量平均每年增加0.383 mg/kg,30~60 cm土层有效磷含量平均每年增加0.323mg/kg。全钾含量0~30 cm土层和30~60 cm土层均无明显变化;速效钾含量随结果年限的增加逐渐降低,0~30 cm土层平均每年降低2.638 mg/kg,30~60 cm土层平均每年降低2.388 mg/kg。
The nutrient contents of apple orchard soil in 3, 6, 9, 12 and 15 years in Qingyang, Gansu Province were determined. The results showed that the soil organic matter and total nitrogen content of 0-30 cm and 30-60 cm soil layers decreased year by year with the increase of the result age of apple orchard; the content of available nitrogen increased at an annual rate, and the average content of available nitrogen in 0-30 cm soil layer per year With an increase of 0.998 mg / kg, available nitrogen in 30-60 cm soil layer increased by 0.655 mg / kg on average per year, but the change was relatively slow after 6 years. The content of total phosphorus increased year by year. The average increase of soil available phosphorus was 0.037 g / kg in 0-30 cm soil layer and 0.028 g / kg soil layer in 30-60 cm soil layer respectively. The content of available phosphorus increased gradually. The content increased by 0.383 mg / kg per year on average, and the available phosphorus content increased by 0.323 mg / kg on average in 30-60 cm soil layer. The content of total potassium in 0-30 cm soil layer and 30-60 cm soil layer did not change obviously. The content of available potassium decreased with the increase of the number of years. The average soil potassium content decreased by 2.638 mg / kg and 30-60 cm in 0-30 cm soil layer The average soil layer decreased by 2.388 mg / kg per year.