江苏省种茧育桑园土壤肥力状况调查

采用化学分析的方法研究江苏省 36个蚕种场种茧育桑园土壤养分供应状况。不同土层的供肥能力相差较大 ,土壤有机质、全氮、速效磷、速效钾、有效铁、有效锰、有效锌和有效铜等所有养分含量均是上层 (0～ 2 0cm)大于下层 (2 0～ 4 0cm) ,上、下层养分含量的相对相差从 14 5 %～ 5 3 8% ,说明种茧育桑园土壤的养分主要集中在上层。不同地区种茧育桑园土壤的供肥能力有较大的差距 ,太湖地区肥力水平较高 ,淮北地区和江淮地区的供肥能力较差 ,而宁镇扬丘陵地区和盐城地区的肥力水平中等 ,因此 ,在淮北地区和江淮地区要加强桑园的肥培管理。土壤微量元素中有效锰和有效铜的供应尚可 ,但盐城地区土壤有缺铁的可能 ,淮北地区和江淮地区有缺锌的可能。

Study on the Soil Fertility of Mulberry Field for Producing Silkworm Eggs in Jiangsu Province

In this paper, the author determined the organic matter, total N, rapidly available P, rapidly available K, available Fe, available Zn, available Mn and available Cu contents of 875 soil samples from 36 silkworm eggs production farms in Jiangsu Province by chemical analysis. There was remarkble difference of soil fertility between upper layer (0～20 cm) and lower layer (20～40 cm), the contents of organic matter, total N, rapidly available P, rapidly available K, available Fe, available Zn, available Mn and available Cu in upper layer (0～20 cm) were higher than those in lower layer (20～40 cm), and the range of relative difference was 14 5%～53 8%. There was markedly difference of soil fertility among different areas, the order of soil fertility in different region is as follows: Taihu Lake area>Yancheng area and Ning-Zhen-Yang hilly area>Jianghuai area and North of Huai River area, and there is a possibility of Fe-deficiency in Yancheng area and Zn-deficiency in Jianghuai area and North of Huai River area.