不同耕作方式对水稻土供钾能力的影响

《不同耕作方式对水稻土供钾能力的影响》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、万方数据西南大学硕士学位论文potassiumofplainculturewithtillageinthe0—20cmsoillayer．Therewerelowestwiththeavailablepotassiumoftillageandridgeculture，theslowlyavailablepotassiumofcombingridgewithno-tillage，andtotalpotassiumofgreenmanurewiththe20—40cmsoillayer．The20—40cmsoilla

2、yerwasbeneficialtomaintainthepotassiumpools．becauseitwashigherthantheO一20cnasoillayer．(2)After22yearslong-termcultivation，differentfarmingmethodstodealwithsoilKclaymineralcompositionwithouttheinfluence，differenttreatmentofsoilandthedifferentdepthinthesoilKclay

3、mineralhaveillite，montmorillonite，kaoliniteandvermiculite．Theorderofitscontentswasexpressedasillite>montmorillonite>kaolinite>vermiculite．Correlationanalysisshowedthat：themontmorilloniteandkaoliniteaffectedsignificantlyillitecontent，withacorrelationcoefficient

4、ofr=-0．740(P<0．01)andr=一O．573(P<0．05)．Inthe0—20cmsoillayer,thevalueofillitewasdecreased，butthevalueofmontmorilloniteWasincreased．Itshowedthat：inthelong—termpaddy-uplandrotationsystem，theillitehadalotofweatheringanddisintegrationintheneutralpurplesoilclay,andac

5、companiedbyalargeformationofmontmorillonite．Inthe20—40cmsoillayer,thevalueofmontmorillonitewasdecreasedexceptoftillageandridgecultureandpaddy-uplandrotation，butthevalueofillitewasincreased．Itshowedthat：inthelong·termpaddy-uplandrotationsystem，theincreaseofmont

6、morilloniteKfixationcapacityleadtoincreaseofillite．(3)After22yearslong-termcultivation，whentheKapplicationratewas0．4to4．0g。L一，theamountoffixedKincreasedwiththeincreaseofKapplied，buttheKfixationratedecreasedindifferenttreatmentofsoilandthedifferentdepth．Therewe

7、redifferentdegreeofincreasewiththeKfixationcapacityonthebasicoforiginalsoilforalloftreatmentsanddepth．Moreover,amongthemtheplainculturewithtillageinthe0—20cmsoillayerandthetillageandridgeculturehadthehighestincreaseamplitudeinthe20—40cmsoillayer．Comparingwiths

8、olecropping，theKfixationcapacitywasrelativelylargewithcroprotation．Inthemonoculturesystem，theKfixationcapacityisinsignificantforalloftreatments．Therelativecontentofclaymineralsinso