Effect Of Waterlogging On Yield And Quality Formation Of Silage Maize

Global climate change leads to an increase in the regular variation of precipitation time and space,which makes crop production in large fields vulnerable to waterlogging and becomes the focus of research affecting agricultural production.The development of silage maize is the key direction of adjusting the structure and production mode of planting industry in China,but the production process of silage maize in Huanghuaihai region is easily affected by excessive rainfall,which causes waterlogging.Therefore,the purpose of this study is to study and clarify the regulatory effects of stage waterlogging and co-improvement of silage maize yield,quality,leaf photolyzing properties and material accumulation,stem development and resistance,and root system,in order to provide a theoretical basis for exploring new ways to regulate the yield and quality synergy of silage maize under waterlogging.The main findings are as follows:1.During the critical period of ear development(V9 and V12),the waterlogging stress caused a significant decrease in the yield of silage maize.After tasseling(VT),the impact on the yield was small.The longer the duration of the waterlogging stress,the more obvious the decrease in the yield of silage maize;The reason is that(1)waterlogging stress significantly regulates grain development,resulting in a significant decrease in ear setting rate,and even ear failure(V12 stage);(2)waterlogging stress causes root development to be blocked,root fresh weight,dry weight,fresh weight The decrease is mainly manifested in the significant reduction of the root fresh weight and dry weight of 10cm-60cm;(3)Flooding stress caused a significant decrease in the leaf area of silage corn,shortened leaf function period,significantly reduced relative chlorophyll content,and significantly reduced dry matter accumulation.2.Flooding stress significantly reduces the silage quality of silage corn.V12 stress has the most significant impact on silage quality,followed by tasseling stage,and V9 treatment has less effect.The longer the flooding duration,the more significant the quality reduction;Silage corn starch and crude protein content decreased,water-soluble carbohydrate content increased,acid detergent fiber and neutral detergent fiber content increased,total digestible nutrients content,resulting in a decrease in milk productivity.3.Waterlogging stress during the critical period of ear development(V9 and V12)significantly hindered the growth of silage maize stalk nodes.The waterlogging stress during VT had little effect on the growth of stalk nodes.The main manifestation was that waterlogging stress resulted in significant internode length Shortening,narrowing of internode diameter,significant reduction of internode dry matter accumulation,slight reduction of puncture strength,and weakening of internode compression and bending properties,resulting in reduced lodging resistance of silage corn.In summary,the results of this study show that waterlogging stress leads to reduced root vigor,leaf leaf area,leaf area function period,and relative chlorophyll content,resulting in reduced leaf photosynthetic capacity and dry matter accumulation in silage maize.The stress shortens the length of the stem nodes and reduces the accumulation of dry matter,resulting in a significant reduction in the puncture strength,compression resistance and bending resistance of the stem,and a reduction in the lodging resistance of the plant;therefore,the waterlogging stress leads to a significant reduction in the yield of silage corn,The quality of silage deteriorates.