Analysis of Physical and Chemical Properties of Saline-alkali Soil under Different Fertilization Methods
[Objective]Soil salinization is one of the most important environmental problems in the world,which directly affects the sustainable development of agriculture.As an extremely sensitive and fragile soil resource,saline-alkali soil is significantly more affected by land use patterns than other soil types.In order to understand the influence of microalgae fertilizer on saline-alkali soil,clarify the improvement effect,optimize the fertilization plan,reveal the mechanism of microalgae fertilizer to improve saline-alkali soil,and promote the rational utilization of saline-alkali land.[Method]The improvement of salinized soil by microalgae fertilizer was taken as the research object,and the physicochemical properties of different soil depths of farmland and improved land were determined by field sampling,and the effects of microalgae fertilizer on soil characteristics of saline-alkali soil under different concentration gradients were analyzed.[Result](1)The soil bulk density of 10#quadrat(microalgae fertilizer 2,application concentration:30 L·hm-2)decreased by 0.146 g·cm-3 compared with that of the CK control area.The soil porosity of 12#quadrat(microalgae fertilizer 3,application concentration:45 L·hm-2)increased by 11.158%compared with that of the non-vegetation control area.(2)The pH value of 10#quadrat(microalgae fertilizer 2,application concentration:30 L·hm-2)decreased by 0.76 compared with that of the CK control area,and the soil total nitrogen content increased by 0.167 g·kg-1 compared with that of the CK control area.The soil total phosphorus content of 9#quadrat(microalgae fertilizer 2,application concentration:30 L·hm-2)increased by 0.194 g·kg-1 compared with that of the CK control area,and the total potassium content increased by 6.63 g·kg-1 compared with that of the CK control area.(3)By analyzing the correlation between soil physical and chemical indexes,there was a significant negative correlation between soil pH and soil total nitrogen(r=-0.810,P＜0.01),and a significant positive correlation between total phosphorus and total potassium(r=0.879,P＜0.01).[Conclusion]The application of microalgae fertilizer played a significant positive role in the improvement of salinized soil.The application of microalgae fertilizer can not only improve the physical and chemical properties of soil,but also help to optimize soil nutrient structure,which provides strong support for the improvement and sustainable development of salinized soil.
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