Plastic Responses Of Physiological Ecology Index And Yield Of Chenopodium Quinoa To Interactions Of Water And Nitrogen

Water and nitrogen interaction,coordination has a certain practical significance to water-saving agriculture in upland.To study the physiological adaptation mechanism of quinoa under drought stress and nitrogen fertilization conditions,and its plasticity in response to drought,poor conditions,so as to promote the planting,quinoa were potted test base water control experiment and manipulated in place with waterproof of the School of Life Sciences,Shan Xi Normal University.The quinoa varieties "Yi-long No.1" was selected as test materials.The pot experiment treatment consists of two factors: the Water Deficit and Nitrogen Supply Level in different growing stages of quinoa.Set up four levels of nitrogen fertilization and three irrigation levels during each growth period.The plant height,leaf area,biomass of quinoa and other parts of the ground;the main root length,total root area of root growth and the physiological characteristics including the Protective Enzyme Activity,root activity,proline and chlorophyll content was measured in each growing stage.Conduct the yield analysis of quinoa suffering from different periods of droughtstress at last.The main conclusions are as follows:1.The growth index and biomass of quinoa in all growth stages under drought conditions decreased significantly,but Root-Shoot ratio,SOD activity,Osmotic regulation substances and other indicators increased significantly,The indicators in different growth stages suffering from moisture change show different degrees of plasticity.The effect of Irrigation on total root area,MDA is the largest in Seedling;on plant height,root activity is maximized in inflorescence-show stage;Stem diameter,root activity showed highest plasticity in Filling stage.2.Within the scope of certain fertilizer,plant height,leaf area index declined after the first increasing after fertilizing,quinoa can still grow at the low fat environment,but low fat will ultimately affect yield;leaf chlorophyll content showed an increasing trend after fertilization,Root-Shoot ratio has been declining,and SOD,POD activity increased after the first declined,but each index at different times showed varying degrees of plasticity to fertilizer.The effect of Nitrogen on Biomass,MDA is the largest;on root weight,NR activity is the largest in inflorescence-show stage;on Root-Shoot ratio,NR activity is the highest in filling stage.Fertilization on the conductivity changes under same irrigation conditions is not significant.3.Comparing three developmental stages of quinoa,The effect of seedling drought to quinoa yield is minimum,the drought effect is the largest on quinoa yield in inflorescence-show stage,have shown that fertilization can make the drought harm degree ease during moderate drought.Although quinoa is drought-resistant crops,but taking intoaccounts in all factors,the combination that soil water was controlled75%-85% field capacity and nitrogen rate was kept 0.1-0.2 g/kg was the best.