Effects of Intercropping and Mixed Sowing on Stem Morphological Characteristics and Lodging Resistance of Two Wheat Varieties
In order to clarify the effects of intercropping and mixed sowing on lodging resistance of winter wheat,the experiment was conducted using Shannong 20(SN20)and Shannong Youmai 2(YM2)as materi-als by setting three planting methods including conventional strip sowing(single sowing),intercropping in in-tervals(SN20//YM2,1∶1)and mixed sowing with equal mass(SN20×YM2,1∶1).The differences in lodg-ing resistance index,stem morphological characteristics and breaking-resistant strength of the second internode under different planting methods were studied,and also the variance analysis of the effects of cultivars,plant-ing methods and their interactions on lodging resistance characters.The results showed that the intercropping and mixed sowing could significantly reduce the height of the centre of gravity and plant height compared to single sowing,but significantly increase the stem diameter,wall thickness,breaking-resistant strength and lodging resistance index of the second internode,mixed sowing performed the best,but the overall difference between intercropping and mixed sowing was not significant.Planting methods had the greatest influences on wall thickness and breaking-resistant strength of the second internode,and lodging resistance index.In the mixed sowing method,the lodging resistance index of YM2 was significantly increased by 54.50％and 10.89％at filling stage,and 65.77％and 30.22％at maturation stage compared with single sowing and intercropping,respectively.In conclusion,under the conditions of this experiment,intercropping and mixed sowing treat-ments reduced plant height and centre of gravity,increased stem diameter,wall thickness and breaking-resist-ant strength of the second internode,and effectively improved the lodging resistance index of winter wheat,so the lodging risk of winter wheat could be reduced and the stress resistance and stable yield could be promoted.The conclusion could provide references for high-and stable-yield and lodging-resistant cultivation of winter wheat.
WheatIntercroppingMixed sowing with equal massStem morphological characteristicsBreaking-resistant strengthLodging resistance index
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