Poor soil structure and nutrients,excessive exchangeable Na^+,high pH as well as low enzyme activities are common in the solonetz,and significantly restrict corn(Zea mays L.)production.Cattle manure application combin...Poor soil structure and nutrients,excessive exchangeable Na^+,high pH as well as low enzyme activities are common in the solonetz,and significantly restrict corn(Zea mays L.)production.Cattle manure application combined with deep tillage is an important management practice that can affect soil physico-chemical properties and enzyme activities as well as corn yield in the solonetz.Field experiments were carried out in a randomized complete block design comprising four treatments:Corn with conventional tillage was used as a control,and corn with manure application combined with deep tillage as well as film mulching and aluminium sulfate were used as the experimental treatments,respectively.The relationship between corn yield and measured soil properties was determined using stepwise regression analysis.Manure application combined with deep tillage management was more effective than conventional tillage for increasing corn yield and for improving soil properties in the solonetz.The highest corn yield was obtained in the treatments with manure application+deep tillage+plastic film mulching(11 472 and 12228 kg ha^(-1)),and increased by 38 and 43%comparing with the control treatment(8343 and8552 kg ha^(-1))both in the 2013 and 2014 experiments,respectively.Using factor analysis,three factors were obtained,which represented soil fertility status,soil saline-alkaline properties and soil structural properties both in the 2013 and 2014experiments,respectively.Manure and deep tillage management resulted in two distinct groups of soil properties:(1)soils with manure application combined with deep tillage and(2)soils with conventional tillage.Stepwise regression analysis showed that corn yield was significantly and positively correlated to urease and available P,as well as negatively correlated to pH,electrical conductivity(EC),exchange sodium percentage(ESP),and bulk density(p_b).We concluded that p_b was dominant factor for corn yield on the basis of discriminant coefficient.Manure application combined with deep tillage management resulted in an increase in corn yield mainly owing to improved soil structural properties,followed by decreased soil saline-alkaline obstacle as well as increased urease activity and available P.This result is likely that the improvement in soil organic matter(SOM)from manure application greatly and positively contributed to better soil physico-chemical properties and enzyme activities,especially decrease in p_b.Suggestion for corn production should be improvement in soilstructural properties firstly.This could cause decrease inρ_b that key factor which limited the corn production in the solonetz.展开更多
基金provided by the National Natural Science Foundation of China(41501315 and 41501316)the Special Funds for the Young Talents Project of Northeast Agricultural University,China(14QC31)+1 种基金the Key Technology Research of Efficient Fertilization of Farmland and Promotion of Land Productivity in Songnen Plain of China(YS15B15)the Fund of Postdoctor in China(2014M551207)
文摘Poor soil structure and nutrients,excessive exchangeable Na^+,high pH as well as low enzyme activities are common in the solonetz,and significantly restrict corn(Zea mays L.)production.Cattle manure application combined with deep tillage is an important management practice that can affect soil physico-chemical properties and enzyme activities as well as corn yield in the solonetz.Field experiments were carried out in a randomized complete block design comprising four treatments:Corn with conventional tillage was used as a control,and corn with manure application combined with deep tillage as well as film mulching and aluminium sulfate were used as the experimental treatments,respectively.The relationship between corn yield and measured soil properties was determined using stepwise regression analysis.Manure application combined with deep tillage management was more effective than conventional tillage for increasing corn yield and for improving soil properties in the solonetz.The highest corn yield was obtained in the treatments with manure application+deep tillage+plastic film mulching(11 472 and 12228 kg ha^(-1)),and increased by 38 and 43%comparing with the control treatment(8343 and8552 kg ha^(-1))both in the 2013 and 2014 experiments,respectively.Using factor analysis,three factors were obtained,which represented soil fertility status,soil saline-alkaline properties and soil structural properties both in the 2013 and 2014experiments,respectively.Manure and deep tillage management resulted in two distinct groups of soil properties:(1)soils with manure application combined with deep tillage and(2)soils with conventional tillage.Stepwise regression analysis showed that corn yield was significantly and positively correlated to urease and available P,as well as negatively correlated to pH,electrical conductivity(EC),exchange sodium percentage(ESP),and bulk density(p_b).We concluded that p_b was dominant factor for corn yield on the basis of discriminant coefficient.Manure application combined with deep tillage management resulted in an increase in corn yield mainly owing to improved soil structural properties,followed by decreased soil saline-alkaline obstacle as well as increased urease activity and available P.This result is likely that the improvement in soil organic matter(SOM)from manure application greatly and positively contributed to better soil physico-chemical properties and enzyme activities,especially decrease in p_b.Suggestion for corn production should be improvement in soilstructural properties firstly.This could cause decrease inρ_b that key factor which limited the corn production in the solonetz.
