Selection And Comprehensive Evaluation Of Silage Corn Varieties In The Sandy Area Of Yuyang

With the improvement of economic level,people’s living standards,as well as the changes in dietary structure,the proportion of animal husbandry in agricultural production is increasing rapidly.Silage corn is one of the important forages,and its quality may influence the production performance of livestock.Therefore,it is crucial to choose high-yield and high-quality silage corn.The variety and planting density are direct factors affecting the yield and nutritional quality of silage corn.In order to select high-quality and high-yield silage corn varieties,which is suitable for planting in the sandy land in Yulin,29 varieties were selected as experimental materials.Through field variety and density comparison experiments,the agronomic traits（growth period,plant height,ear position,green leaf number）,biological yield,nutritional quality（crude protein,starch,neutral washing fiber,acidic washing fiber）,and other indicators were statistically analyzed.The main results are as follows:1)From the perspective of biological yield,6.75×10⁴plants per hm^-2,in Experiment 1,the best fresh grass yield was found in Dajing Jiu 26 and Quchen 9,which were 109089.74kg·hm^-2and 110935.9 kg·hm^-2,respectively.The lowest yield was found in variety NK815,which was 81288.46 kg·hm^-2;The best fresh grass yield in Experiment 2 was Jinling Silage 17,which reached 46794.87 kg·hm^-2,while the lowest variety,Kehe 699,was 36705.13 kg·hm^-2.When the density increased to 8.25×10⁴plants per hm^-2,the highest fresh grass yield was Jinling Silage 17,which reached 48166.67 kg per hm^-2.The lowest variety of Kehe 699,was 36346.15 kg per hm^-2.In Experiment 1 6.75×10⁴per hm^-2,the best high yield was found in Dajingjiu 166,which was 110935.9 kg·hm^-2.The lowest yield is Luobainuo 2,which was 20144.18 kg·hm^-2;The highest yield in Experiment 2 was found in Dajing Jiu 26,reaching 20492.17 kg·hm^-2.The lowest Yuqing 21 is 17402.86kg·hm^-2.Experiment 2:when the density is 8.25×10⁴plants per hm^-2,the variety with the best yield is Jingang,reaching 19762.11 kg·hm^-2.The lowest Jinling silage is 10,which is17019.45 kg·hm^-2.2)From the perspective of nutritional quality measurement,the crude protein content of all 20 test varieties in Experiment 1 was higher than 6%,with Jingke 665 having the highest content of 9.79%and Luxingnuo 1 having the lowest content of 7.84%;The starch content is mostly higher than 20%,all of which meet the standard;The content range of NDF and ADF is 14.36%～37.98%and 34.1%～58.83%respectively;According to the relative feeding value,most of the forage quality of the tested products is considered to be super grade.In Experiment 2,the crude protein content of the 9 tested varieties was higher than 6%under both densities,with 6.75×10⁴plants per hm^-2,the highest content of diamond is 6.96%,while the lowest content of Jinling Silage 10 is 5.41%;While the density is8.25×10⁴per hm^-2,the highest content of Yuqing 21 is 6.89%,while the lowest content of diamond is observed;The starch content is greater than 20%at both densities;The content range of NDF and ADF is 29.77%～37.82%and 15.09%～20.12%,respectively in density of6.25×10⁴plants per hm^-2,while 8.25×10⁴per hm^-2,the content range of NDF and ADF is29.06%～41.04%and 14.62%～20.58%,respectively.The relative feeding value of the 9tested varieties in this study exceeded 150,indicating that they are of special grade.3)Based on the principle of grey correlation degree,comprehensively analyze the measured data,6.75×10⁴plants per hm^-2,the best silage corn varieties are:Jingke 665,Dajingjiu 166,Dajingjiu 4059,NK815,Jinggang,and Kehe 699;8.25×10⁴plants per hm^-2,the best varieties are Jinling Silage 17 and Kehe 699.The above varieties are suitable for large-scale promotion and planting in the sandy areas of Yulin.