Characterization Of Soil Microbe And Physical And Chemical Properties Under Periodic Straw Returning With Deep Plowing

Straw returning is an important means to improve soil production potential and ensure the sustainable development of agriculture.The western part of Liaoning Province is a semi-arid area.In particular,many years of rotary tillage have seriously damaged the soil structure,and it is impossible to adopt the existing straw cover and the year-round model of deep-turning.It is urgent to construct a reasonable technical model of soil with dual functions of enhancing soil fertility and protecting soil structure.To this end,in the Daguben Town of Fimeng County,the interval test with the full amount of straw turned into the field as the core was carried out,and the returning field,the returning field every other year,and the returning field,the local rotary tillage is not returned to the field farming method as a control.In the fall of 2013,it was treated in the next two years and every other year,and in the autumn of 2015,it was processed in the fall.In 2017,soil available nutrient content and microbial quantity were measured dynamically,and soil physical properties,organic matter content and yield were determined in autumn.In the autumn of 2018,soil available nutrients,organic matter content and yield were determined.The results showed that:1.The results of 2017 measurements show that the same number of straw treatments increase corn yield,with the largest increase in returning fields in 1 year,followed by returning to fields and returning to fields in 2 years;the results of 2018 indicate that different straws are processed,The year-on-year increase in the largest field.2.For the 0-10 cm soil layer,the porosity of the capillary tube is returned to the field every other year;the soil moisture content in the autumn is increased by one year and the same year,but it is reduced in the next two years.For the 10-20 cm soil layer,the straw returning to the field reduced the bulk density and increased the total porosity,and the largest variation in the returning field after 2 years;the return of the capillary and the saturated water holding capacity in the field increased by returning the fields and returning to the fields every 2 years.For the 20-30 cm soil layer,the bulk density is reduced by one year and every 2 years,and the total porosity,capillary porosity and field water holding capacity are increased and the effects are greater than that of successive years.The pre-tightness gradually increases with the increase of depth,and the change trend of each treatment is similar.In the later stage,soil compaction showed the largest increase in surface layer,then gradually decreased to constant,and the lower layer declined.The change rules of each treatment were similar.The inflection point of the control change was 17.5-20 cm.The main effect of returning to the field in 2 years was 20-22.5 cm.The layer is mainly affected by the 17.5-27.5cm soil layer every other year,and the field is returned to the 27.5cm soil layer.3.In 2017,the amount of alkali-decomposed nitrogen in the 0~10cm soil layer decreased in the same year;the alkali-dissolved nitrogen content in the 10-20 cm soil layer was increased by 2 years and every 1 year,and the increase in the field was the largest in 2 years;The annual alkalinity increased the alkali nitrogen content of the 20-30 cm soil layer.In 2018,the amount of alkali-decomposed nitrogen in the 20-30 cm soil layer was increased by returning to the field every two years,and returned to the field every other year.In 2017,the amount of available phosphorus in 0-10 cm soil layer will be increased in returning to the field every other year;the amount of available phosphorus in 10-20 cm soil layer will be increased by returning to the field and returning to the field every two years,and the increase in the field will be the largest in successive years;The field increased the available phosphorus content in the 20-30 cm soil layer and reduced it in the same year.In 2018,the amount of available phosphorus in the 0-10 cm soil layer was reduced in the next year;the available phosphorus content in the 10-20 cm soil layer increased in the same year,and the remaining treatment decreased.The available phosphorus content in the 20-30 cm soil layer increased in the next 2 years.In 2017,the amount of available potassium in the 0~30cm soil layer will be reduced in the next two years,and the available potassium content in the 0~10cm soil layer will be reduced in the same year.In 2018,the returning field will be reduced to 0~10cm in the next two years.The available potassium content;the amount of available potassium in the 20-30 cm soil layer increased by 2 years,and decreased in the same year.There are differences in the organic matter content of different soil layers.In 2017,the annual return of the field will reduce the organic matter content of the 0-10 cm soil layer;the return of the field and the return of the field will increase the organic matter content of the 10-20 cm soil layer every year;the treatment will reduce the organic matter content of the 20-30 cm soil layer,and the annual return to the field The decline is small.In 2018,each treatment reduced the organic matter content of the 0-10 cm soil layer,which was smaller in one year;the organic matter content of the 10-20 cm soil layer was reduced by returning to the field every other year;the returning to the field was increased after 2 years.Organic matter content of 20 to 30 cm soil layer.4.The change curve of available NPK in 0-10 cm soil layer gradually decreased.On July 8th,a peak appeared.The variation trend of each colony was different.The number of fungi increased significantly from June 10,July.On the 8th,the highest content was not returned to the field;on August 5,it returned to the field in 2 years,and the year was the least in the field;on September 2,it returned to the field in successive years;the peak of the number of bacteria and actinomycetes appeared on August 5 On the day,the number of transactions is the highest every one year.The change curve of available NPK in 10-20 cm soil layer was similar,first increased and then decreased.On August 5th,a peak appeared,and the content of straw returned to the field was the highest.Fungi,bacteria and actinomycetes showed similar trends,with a small number in the early stage and a rapid increase on August 5.The content of fungi,bacteria and actinomycetes was the highest in the control,returning to the field every 2 years,returning to the field every other year.The three treatments in the field have been reduced in successive years.