Effect Of Different Particle Sizes Of Soil Acidification Of Modified Acid And Peanut Growth In Red Soil

Red soil acidification,which as a main cause that promoted the upland red soil degradation,has attracted people's extensive attention.Looking for the method to improve the soil acidification has been lasted for a long time.Of which,lime application has been used widely to soil amendment.But the negative effects of lime application has been appeared,along with the time growth and research continues.Therefor,it is very necessary to study the new soil amendment.Biomass ash,as a residue of biomass plant,needed to be treated appropriately avoiding environment pollution.But the conventional methods,such as pile up or landfill,could not effectly deal with this type of residue.It is urgent to re-treated the residue in a new way.The soil application,especially after size-reduction,is a effectly way to handle it.But little knowledge is known about the effect of biomass ash field application on soil acidification improvement.Based on this,the soil amendent with different sizes was developed to study its'effect on soil acidification improvement,therefor provide a new way to soil acidification improvement.The indoor water extraction,soil incubation,organism simulating testing,and field experiment were adopted to study the nutriment release characteristic of the soil amendment with different sizes and its effect on soil acidification improvement.The main results were as follows.(1)The p H of water solution with different particle sizes of amendmentsgradually increased with the increasement of time,and the smaller the particle sizes was,the higher the p H was.The p H rises fast in the initial stage,then gradually flatten over the time,and there was no difference of p H at the time of 77 d.The amount of releasedsoil base cations(K⁺,Ca²⁺,Na⁺,Mg²⁺)decreased with the increasement of time,and plummeted in the initial 21 d,then decreased slowly and gradually flatten over the time.The same releaseamount of K⁺,Na⁺and Mg²⁺appeared between 7 and 21 d,and Ca²⁺appeared between 21 and 35,the releaseamount was the largest at first 7 days.(2)Different particle sizes of amendments increased soil p H on varying degrees,and increased by 0.08-0.25 averagely,the initial p H of A2(4.74)and A3(4.73)were lower than A1(4.82),while the p H at 21 d of A2(4.64)and A3(4.68)higher than A1(4.61).Different particle sizes of amendments increased the content of soil base cations(K⁺,Ca²⁺,Na⁺,Mg²⁺)and available nutrient.The content of exchangeable K+,Ca2+,Mg2+were increased by 34.48%,61.94%and 83.33%in A2,meanwhile increased by 31.03%,47.01%and 70.08%,respectively.And the content of available P of treatments A2,A3 was significantly higher than other treatments,increased by an average 2.47cmol(+)·kg^-1?2.61cmol(+)·kg^-1,but no significant effect on the content of soil exchangeable Na⁺and available nitrogen.(3)Different particle sizes of amendments increased peanut tiller number,plantheight,full fruits and dry weight,and the dry weight of peanutyield were increased by 7.21%(A6)-58.52%(A2).Peanut tiller number,full fruits,straw dry weight and seedsdry weight in A2 and A3 were significantly higher than other treatments.And the soil p H were increased by 0.09-0.18 averagely in different particle sizes of amendments.Exchangeable H⁺and Al³⁺were decreased by 0.01-0.08cmol(+)·kg^-1 and0.28-1.48cmol(+)·kg^-1,while available K⁺were increased by 14.44-38.60mg·kg^-1,and the the largest increase was found in A2(78.09%).The crop output in A2 and A3 were significantly higher than other treatments,increased by 25.18%and 29.51%,respectively.The grain yield of A2,A3 treatments were significantly higher than other treatments.In addition,the content of nutrient in peanut straw,shell,nutlet of treatments A2,A3 were also higher than other treatments.