Study On The Technique Of Harvesting And Drying Mechanisms Of Alfalfa In Salinity-Alkalinity Soil Of Hetao District

In this manuscript,the alfalfa planting base in Halingeer Town,Baotou City,the interlaced zone between Hetao district and Tumote Plain is used as the test point,and the salt-alkali tolerant alfalfa cultivar "Zhongmu No.3”is used as the material,non,lightly,moderately and heavily saline-alkaline sites are the entry points,using single-factor and two-factor experimental design,using SPSS,Sigmaplot and Photoshop software,combined with variance analysis and regression analysis,the study found that:(1)Comprehensive alfalfa fresh grass yield,hay yield,fresh-to-dry ratio,stem-to-leaf ratio,dry matter(DM),neutral detergent fiber(NDF),acid detergent fiber(ADF),crude protein(CP),and relative feed value(RFV)were obtained:The optimum stubble height in Hetao saline district is 4-6cm.(2)Combined with two crops of tedded test,it is concluded that,compared with the non-tedded(TO)treatment,in the non-saline-alkaline land,the two-time-tedded(T2)to reach the target moisture content requires less time and high quality;in the lightly saline-alkali land,the tedded treatment reduces the time required for drying,but reduces the quality;in moderately and heavily saline-alkali soil,tedded treatments did not reduce the time required for drying,and had no significant effect on quality.(3)The ultrastructure diagram of alfalfa showed that compared with the no-tedded treatment,the tear degree of the stem was deeper in the two times tedded treatment.Specifically,the tear state of the two times tedded treatment extended from the medullary tissue to the xylem,and moderately.And heavily saline-alkaline marrow tissue tearing,the epidermis also fell off accordingly.(4)During the early drying process,the surface soil temperature has a large correlation with alfalfa water dispersion,and has a negative linear relationship(non-saline alkali land:r2=0.582,P<0.001;lightly saline-alkali land r2=0.834,P<0.001;moderately saline-alkali land r2=0.558,P<0.001;heavily saline-alkali land:r2=0.500,P<0.001);in non-saline-alkali land and moderately saline-alkali land,there is a high correlation between surface soil moisture and alfalfa water content,with a positive linear relationship(non-saline-alkali land:r2=0.697,P<0.001;moderately saline-alkali land:r2=0.565,P<0.001);in moderately and heavily saline-alkali land,there was a positive relationship between the humidity and moisture content of dry grass layer(moderately saline-alkali land:r2=0.860,P<0.01;heavily saline-alkali land:r2=0.791,P<0.05).(5)In the early period of drying process,moisture loss of alfalfa is closely related to leaf water potential and K+content.Plant water decreased with increasing leaf water potential,showing a negative linear relationship(non saline-alkali land:r2=0.932,P<0.001;lightly saline-alkali land:r2=0.718,P<0.001;moderately saline-alkali land:r2=0.853,P<0.01;heavily saline-alkali land:,r2=0.945,P<0.001).At night,the leaf water potential decreases,the moisture absorption capacity increases,and the water content also increases accordingly;the K+content of the leaf is highly correlated with the water content(non saline-alkali land:r2=0.844,P<0.001;lightly saline-alkali land:r2=0.773,P<0.001;moderately saline-alkali land:r2=0.853,P<0.001;heavily saline-alkali land:r2=0.858,P<0.01).