菌肥与有机无机肥配施对石灰性土壤不同形态氮素的影响

利用不同施肥处理对山西省晋中市石灰性土壤几种不同形态氮素含量的变化及其相关性进行研究。结果表明:每个施肥处理施入等量的氮(N)、磷(P2O5),土壤的铵态氮、硝态氮及微生物氮含量都在逐年增加,其中有机肥+化肥+菌肥处理对提高土壤铵态氮作用明显;单施有机肥处理对提高土壤硝态氮效果显著,与有机肥+化肥+菌肥、有机肥+化肥处理效果差异性不显著;有机肥+化肥+菌肥处理对土壤微生物氮效果最明显,有机肥+化肥效果次之,两处理差异显著。土壤铵态氮和硝态氮含量呈显著正相关;微生物氮与铵态氮、硝态氮含量相关性都不好;菌肥与有机无机肥配施后,菌肥对于提高土壤微生物氮最显著(10.09%),铵态氮次之(6.24%),硝态氮不明显(2.05%),因此虽然添加了菌肥,但是没有完全改变"有机肥+化肥+菌肥"仍然是"有机肥+化肥处理"的本质属性。

Effect of Microbial and Chemical,Organic Fertilizer on Different Nitrogen in Calcareous Cinnamon Soil

The experiment was conducted to investigate the influence of different application fertilizers on different nitrogen and correlation of them in the calcareous cinnamon soil,in Jinzhong,Shanxi province.The results shows: When adding the same content of N and P2O5 in each treatment of application,NH+4-N,NO-3-N and SMB-N increased gradually,the effect of chemical+organic+microbial was obvious for NH+4-N,organic fertilizer separately application was the best for NO-3-N,the difference was not significant with the chemical+organic and chemical+organic+microbial;the effect of chemical+organic+microbial was remarkable,and there were the significant difference with the chemical+organic;there was a significant positive correlation between NO-3-N and NH+4-N,and there was not the correlation between SMB-N and NO-3-N,NH+4-N.Increasing the content of SMB-N was the best(10.09%) by microbial fertilizer,NH+4-N was the second(6.24%),NO-3-N was the least(2.05%),though microbial fertilizer was added,and the fact that chemical+organic+microbial was chemical+organic treatment still was not changed entirely.