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[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。
[Objective] The research aimed to study the content and regularity of N, P, K in different soil layers of walnut growing at different ages. [Method] The soil samples from different soil layers in early age and thin walnut new varieties of Lvling were collected and the contents of organic matter and available N, P and K were determined. [Result] The results showed that in the walnut orchard of 1 to 8 years, the content of soil organic matter in each soil layer decreased successively. The upper soil (0 ~ 20 cm) (middle layer soil (21 ~ 40 cm) ~ 60 cm). The content of available N in middle soil was higher than that in upper soil and lower soil. In middle-aged 1-4 years, the content of available P in middle soil was higher than that in upper soil and lower soil, while in 5-8 years, In the upper soil and the lower soil; in the 1 to 6 years and 8 years in the garden, the middle soil quick-acting K content is higher than the upper soil and lower soil, 7-year garden, then lower than the upper soil. N and available P were 76.3 mg / kg and 103.21 mg / kg, respectively. The contents of available K and intermediate P in the middle soil were the highest in the five years, with the lowest values being 149.0 mg / kg and 6.34 mg / kg, respectively. The lowest content of soil available N was 58.5 mg / kg. The lowest content of available K was 58.5 mg / kg for 7 years. [Conclusion] This study could provide a theoretical basis for determining the scientific fertilization management of early mature walnut orchard .