Effects of Long-Term Application of Organic Fertilizer on Soil Organic Carbon,Total Nitrogen and Humus Components
To clarify the effects of long-term application of organic fertilizer on soil organic carbon,total nitrogen and humus components,this study was carried out based on a 43-year long-term positioning fertiliza-tion experiment in Laiyang,Shandong Province,with a total of 7 treatments.The treatments were no fertiliza-tion(CK),low organic fertilizer(M1,30 t/hm2),low organic fertilizer combined with low nitrogen fertilizer(M1N1,138 kg N per hectare),low organic fertilizer combined with high nitrogen fertilizer(M1N2,276 kg N per hectare),high organic fertilizer(M2,60 t/hm2),high organic fertilizer combined with low nitrogen fertilizer(M2N1)and high organic fertilizer combined with high nitrogen fertilizer(M2N2).The results showed that the application of organic fertilizer significantly increased the content of organic carbon and total nitrogen(TN)in each soil layer,and M2N2 treatment had the best effect.Compared with CK treatment,the soil organic carbon and TN contents increased by 239.02%and 293.02%(0～5 cm),256.01%and 319.37%(5～10 cm),247.51%and 349.00%(10～20 cm),164.67%and 348.88%(20～30 cm),respectively.Af-ter long-term application of organic fertilizer,the contents of water-soluble substances,extractable humus sub-stances,humin and humic acid in soil were increased,but the content of fulvic acid was significantly reduced by M1N1 and M2N1 treatments in 10～20-cm soil layer.Under the experimental conditions,the M2N2 treat-ment had the best effect on increasing soil organic carbon,total nitrogen and humus components.
Long-term application of organic fertilizerSoil organic carbonTotal nitrogenHumus com-ponents
万方数据
维普
