摘要
有机肥与化肥长期(7～9年)配合施用,可提高土壤有机质和全氮含量.在肥力较低的红棕紫泥上,有机质增加10.7%～11.9%,全氮提高18.3%～20.2%;在肥力较高的灰棕紫泥上,有机质也略有增加,为1.7%～4.4%。在提高稻田土壤有机质的作用中,有机氮与化肥氮桉1:1配施,效果最好,且细绿萍优于猪粪和胡豆青.故在申低产紫色水稻土上,稻田养萍,是培肥地力和节月巴高产的一个途径.
In 3 long-term experiments,in which organic manures were applied to the paddy soils in comination with chemical fertilizers successively for 7—9 ycars,organic matter and total N increased by 10.7%—11.9% and 18.3%—20.2%,respectively,in the red brown purple soil with lower fertility. Organic matter also showed a slight increment (1.7%—4.4%) in the grey brown purple soil.The best result for increasing organic matter in paddy soils was achieved by applying organic manures (Azolla.filiculoide,pig waste or broad bean) and chemical fertilizers with a ratio of 1 orgnic N:1 chemical N.Therefore,culture of A.fliculoidein paddy soils is re- commended to improve their fertility,decrease the amount of chemical fertilizer used and obtain higher rice yield.
出处
《西南农业大学学报（自然科学版）》
CSCD
1993年第4期314-317,共4页
Journal of Southwest Agricultural University
关键词
土壤有机质
有机肥
化肥
氮素
organic fertilizers
chemical fertilizers
content of organic matters/content of total N
