不同年龄早实核桃园土壤N·P·K含量变化研究

目的]探明不同年龄核桃生长地不同土层N、P、K的含量和规律。方法]取不同年龄时期早实薄皮核桃新品种绿岭园地不同土层土样,测定其中有机质和速效N、P、K含量。结果]结果表明：在1～8年的核桃园地中,各土层土壤有机质含量呈依次下降的趋势,上层土（0～20 cm）（中层土（21～40 cm）（下层土（41～60 cm）,中层土速效N含量高于上层土和下层土;在1～4年的园地中,中层土速效P含量高于上层土和下层土,5～8年的园地中,则低于上层土和下层土;在1～6年和8年的园地中,中层土速效K含量高于上层土和下层土,7年的园地中,则低于上层土。1年园地中层土速效N和速效P含量最高,分别为76.3 mg/kg和103.21 mg/kg;5年园地中层土速效K含量最高,速效P含量最低,分别为149.0 mg/kg和6.34 mg/kg;6年园地上层土速效N含量最低,为58.5 mg/kg;7年园地下层土速效K含量最低,为58.5 mg/kg。结论]该研究可为确定不同年龄早实核桃园土壤的科学施肥管理提供理论依据。

Variation of N,P,K Contents in Different Soil Layers at Different Ages of the Early Bearing Walnut Orchard

Objective]The research aimed to investigate the contents and rules of N,P,K in different soil layers at different ages of the early bearing walnut orchard.Method]The contents of available N,P,K and organic variation of different soil layers at different ages were determined of early bearing walnut orchard.Result]The results indicated that all layers of organic matter content of the soil were tended to decline,0-20 cm soil layer﹥21-40 cm soil layer﹥41-60 cm soil layer,the contents of available N in 21-40 cm soil layer were higher than that of 0～20 cm and 41～60 cm.In 1-4 a orchard soil,the contents of available P in 21-40 cm soil layer were higher than that of 0-20 cm and 41-60 cm.In 5-8 a orchard soil,the contents of available P in 21-40 cm soil layer were lower than that of 0-20 cm and 41-60 cm.In 1-6 a and 8 a orchard soil,the contents of available K in 21-40 cm soil layer were higher than that of 0-20 cm and 41-60 cm.In 7 a orchard soil,the contents of available K in 21-40 cm soil layer were lower than that of 0-20 cm.In 1a orchard soil,the contents of available N and P in 21-40 cm soil layer were the highest,that were 76.3 mg/kg and 103.21 mg/kg,respectively.In 5a orchard soil,the contents of available K in 21-40 cm soil layer were the highest,the contents of available P in 21-40 cm soil layer were the lowest,that were 149.0 mg/kg and 6.34 mg/kg,respectively.In 6a orchard soil,the contents of available N in 0-20 cm soil layer were the lowest,that were 15.8 mg/kg.In 7 a orchard soil,the contents of available K in 41-60 cm soil layer were the lowest,that were 58.5 mg/kg.Conclusion]This study could provide theoretical references for the determination of scientific fertilization management of early bearing walnut orchard soil.