金昌市土壤养分现状与施肥建议

通过2002年秋后对甘肃省金昌市1县1区12个乡镇10万hm2耕地的601个土样化验分析,结果表明:土壤有机质含量平均15.1g/kg,大面积处于较缺和中等状况,而且较缺面积在扩大,中等面积在减少。土壤碱解N含量平均38mg/kg,以缺和较缺占据了绝大部分面积,而且缺的面积在扩大,较缺面积在减少。土壤有效P含量平均20.9mg/kg,明显增加,已处于中等和较丰富状况,也有一定面积处于较缺状况。土壤速效K含量平均158mg/kg,明显下降,大面积处于较丰富和中等状况,中等面积大幅度增加。

Soil Nutrients in Farmlands of Jinchang City and Fertilization Recommendations

In 2002, 601 soil samples collected from sites extensively scattered over 100,000 hm2 of farmlands in 12 villages and towns of Jingchang City, Gansu Province were analyzed with results showing that the average content of soil organic matter in those soil was 15.1g/kg, and a large proportion of the farmlands was low or medium; and the proportion of the farmlands low in soil organic matter was growing while the one that was medium was shrinking. On the other hand, the average content of alkalytic nitrogen in those farmlands was 38 mg/kg, and farmlands deficient or fairly deficient in alkalytic nitrogen accounted for the most part of the farmlands. And the former was expanding and the latter reducing. The average content of available P in those farmlands was 20.9 mg/kg, showing an obvious increase. Most of the farmlands were high or medium in available P content and only a small portion was still low. The average content of available K in those farmlands was 158 mg/kg, showing an obvious drop. Most of the farmlands remained high or medium. The acreage of the farmland medium in soil available K was growing by a large margin.