Improvement Effect Of Organic Fertilizer And N On Coastal Salinization Soil

The coastal saline soils in China are characterized by large area,poor soil structure,high salt content and low soil fertility.Unreasonable farming methods lead to the accelerated formation of the saline soil,the increase of soil salinization and salt stress to crop.Therefore,under the condition that the causes of salinized soil can not be eradicated,it is an important way to find suitable fertilization method of salinized soil for the utilization of it.The effect of organic fertilizer and N fertilizer on the improvement of coastal salinized soil was studied.The salinized soil of Bohai Farm,Lijin County,Dongying City,was used as the research object,ten different treatments were set up respectively:O1N1(OF:15 t·ha^-1,AN:112.5 kg·ha^-1,double top application),O2N1(OF:30 t·ha^-1,AN:112.5 kg·ha^-1,double top application),O3N1(OF:45 t·ha^-1,AN:112.5 kg·ha^-1,double top application),O1N2(OF:15 t·ha^-1,AN:150 kg·ha^-1,double top application),O2N2(OF:30 t·ha^-1,AN:150 kg·ha^-1,double top application),O3N2(OF:45 t·ha^-1,AN:150 kg·ha^-1,double top application),O2N3(OF:30 t·ha^-1,AN:75 kg·ha^-1,SN:75kg·ha^-1,double top application),O3N3(OF:45 t·ha^-1,AN:75 kg·ha^-1,SN:75 kg·ha^-1,double top application),O0N3(OF:0 t·ha^-1,AN:75 kg·ha^-1,SN:75 kg·ha^-1,double top application),O0N0(OF:0 t·ha^-1,N:0 kg·ha^-1).An improved model was established to promote soil salt elimination and alkali removal in coastal salted soil by means of"Organic Fertilizer Combined with AN and SN",and a functional model of the relationship between the amount of OF and the evaporation rate of soil was established.The conclusions are as follow:?1?Under the experimental conditions,the amount of OF was negatively correlated with the soil water-soluble salt content,EC,pH,and the evaporation rate.Compared with the non-fertilization treatment,the content of water-soluble salt in coastal saline soil decreased by 38.83%when the amount of OF was 45 t·ha^-1combined with AN and SN are both 75 kg·ha^-1.The largest decrease in soil pH is9.92%when the amount of OF was 45 t·ha^-11 combined with AN 150 kg·ha^-1.There was a linear negative correlation between the amount of OF applied and the rate of soil evaporation,the decrease range of soil evaporation rates were between9.47%-27.30%for the treatments of which used 45 t·ha^-11 OF compared with which used 0t·ha^-11 OF.The application rate of OF was 45 t·ha^-11 combined with AN150kg·ha^-1,and the soil moisture content was the highest,which was 12.35%higher than that of the unfertilized treatment.?2?Under the condition of experiment,there was a positive correlation between the amount of OF and the contents of soil organic matter,TN,AvP and AvK.The soil TN content of soil was the largest,which was 40.94%higher than that of non-fertilization treatment,when the amount of OF was 45 t·ha^-11 combined with AN are 150 kg·ha^-1.The content of AvP in soil was 30.06%higher than that of unfertilized treatment when the amount of OF was 45 t·ha^-11 combined with AN 112.5kg·ha^-1.When the amount of OF was 45 t·ha^-11 combined with AN 150kg·ha^-1,the content of AvK in soil was the highest,which was 59.28%higher than that of unfertilized treatment.?3?Under the O3N3 treatment,the biomass of the wheat and maize is the largest,and the improvement effect on the coastal saline soil is the best.