The effects of sheep manure and humic acid on saline alkali soil improvement and wheat yield
[Objective]To explore the improvement effect of adding sheep manure and humic acid on saline-alkali land in Hebei Province.[Methods]A field experiment was conducted in Lincheng County,Hebei Province,and five treatments were set up:no fertilization(CK),single application of compound fertilizer(T1),compound fertilizer with sheep manure(T2),compound fertilizer with humic acid(T3),and compound fertilizer with sheep manure and humic acid(T4).The effects of different fertilization treatments on soil fertility,wheat yield,soil physical properties,enzyme activities and microorganisms were analyzed.[Results]Compared with CK,soil fertility was significantly improved by all treatments,and the maximum increase of T4 treatment was 154.81%.Wheat yield was significantly increased by 58.52%,89.25%,83.96%,108.81%(P<0.05),and T4 treatment had the best effect.It can reduce soil pH value,soluble salt concentration(EC)and bulk density.T4 treatment has significant effect,and the maximum reduction was 6.72%,21.75%and 7.75%,respectively.Soil porosity could be improved,and the maximum increase of T4 treatment was 33.94%.Soil enzyme activity was significantly increased(P<0.05),and the maximum increase of T4 treatment was 142.41%.The number of fungi,bacteria and actinomycetes and the total amount of microorganisms in soil could be increased by T4 treatment,and the maximum increase was 158.10%,147.32%,117.99%and 145.25%,respectively.[Conclusion]Adding application of sheep manure and humic acid can improve soil fertility saline alkali land,increase wheat yield,improve soil physical properties,increase soil enzyme activity and microbial total amount,and can be used as an effective means to improve saline-alkali soil in Lincheng County,Hebei Province.
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