摘要
本文根据我国建国以来主要的研究结果对我国土壤氮、磷、钾的基本状况进行了概略的阐述。我国土壤氮磷钾含量的变幅:N是0.04-0.38%;P是0.017-0.11%;K是0.05—2.50%。耕地土壤几乎全部都需补给氮素。大约有1/2-1/3缺磷,1/4-1/3缺钾。缺钾土壤主要分布在长江以南,但北方土壤的缺钾问题也需要及时注意。成土母质、风化程度和人为的耕作施肥措施是影响土壤氮、磷,钾状况的主要因素。
1. The content range of total soil nutrients of China are as follows: N: 0.04—0.38% P: 0.02—0.11% K: 0.05—2.5%
2. Generally, the NPK content of soils under natural vegetative cover is higher than that under cultivation, and the nutrients content of paddy soils greater than that of dryland soils of the same origin.
3. Total and available nutrient levels of soils are mainly influenced hy parent material, degree of weathering and histrry of cultivation.
4. Almost all the soils of arable lands of China need nitrogen application, while about 1/3—1/2 of arable land area is deficient in phosphorus, and 1/4—1/3 deficient in potassium.
5. The phosphorus level of soils deficient now in phosphorus is increasing gradually because of phosphorus fertilizer application, while that of soils not deficient now in phosphorus is getting decreased because of phosphorus unbalance.
6. The area of soils deficient in potassium has a tendency to increase.
7. Based on the results now available, the sketch maps of soil nitrogen, phosphorus and potassium status of China were compiled.
出处
《土壤学报》
CAS
CSCD
北大核心
1989年第3期280-286,共7页
Acta Pedologica Sinica
