三种施肥模式对石灰性土壤培肥的影响

试验在中国科学院封丘农业生态实验站的石灰性潮土上进行 ,在氮、磷、钾固定用量和比例的基础上 ,选定全施有机肥、全施化肥、有机肥和无机肥配合施用三种处理。结果表明 ,这三种施肥模式都显著地提高了土壤全氮和速效氮、土壤全磷和有效磷、土壤全钾和速效钾含量。有机肥在提高土壤全氮和速效氮含量方面效果明显优于无机肥 ,对土壤速效磷含量的影响也高于无机肥 ,但是对土壤全磷含量的增加效应上不如无机肥大。无论是有机肥中的钾还是无机肥中的钾 ,对土壤全钾的贡献没有明显的差别 ;但是在土壤速效钾方面 ,无机肥中的钾对其影响大于有机肥中的钾。有机肥和无机肥的配合施用是提高石灰性潮土土壤肥力更好的方法。

EFFECT OF THREE FERTILIZING MODELS ON SOIL FERTILITY OF CALCAREOUS SOIL

The experiment was carried out in calcareous soil in Fengqiu Agri ecological Experimental Station (Chinese Academy of Sciences). Organic fertilizer,inorganic fertilizer and organic fertilizer matching inorganic fertilizer were used in fixed proportion(N 300 kg hm -2 , P 2O 5 135 kg hm -2 , K 2O 300 kg hm -2 ). After 10 year experiment, the content of total N, P, K and available N, P, K of soil were increased significantly under three fertilizing treatments. Compared with inorganic fertilizer treatment, organic fertilizer treatment had better effect on increasing the contents of total nitrogen and available nitrogen as well as the content of available P. However, there are no significant difference on the content of total potassium of soil among three treatments. The experiment results shown that it is more suitable way to match organic fertilizer and inorganic fertilizer for increasing soil fertility.