摘要
对长期 (2 4年 )不同施肥土壤中磷淋溶趋势的研究结果表明 :土壤耕层 Ca Cl2 - P和 Water- P的含量远比 Olsen- P要小得多 ,可以淋溶的磷素含量普遍较低 ;长期施用厩肥和化肥加秸秆并休闲的土壤更易发生磷素淋溶 ;Ca Cl2 - P和 Water- P之间以及 Water- P和 Olsen- P之间的相关系数均达到极显著水平 ;土壤耕层中 Olsen- P含量达 2 3mg/ kg,是该土壤发生磷素淋溶的“阈值”。
Studies on 'threshold value' of phosphorus leaching in long term different fertilization soils was conducted.The results showed that:(1) the contents of CaCl 2 P and Water P were far lower than that of Olsen P in soil plow layer,so the content of leaching phosphorus was low;(2) It was easy to replace phosphorus leaching by long term application of farm yard manure and fallow with long term application of chemical fertilizers and corn litter;(3) it had very significance between CaCl 2 P and Water P,and between Water P and Olsen P,the correlation coefficients were 0.920 4 ** and 0.779 9 ** ,respectively;and (4) 'threshold value' of phosphorus leaching from the soils was 23 mg/kg of Olsen P content.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2003年第3期123-126,共4页
Journal of Northwest A&F University(Natural Science Edition)
基金
教育部留学回国人员科研启动基金资助项目
陕西省自然科学基金项目 ( 2 0 0 2 D0 9)
