Effects on Canopy Light Distribution of Winter Wheat at Booting Stage:Irrigation,Drought and Nitrogen Level
The aim was to discuss the effects of irrigation,drought and nitrogen on canopy light distribution of multi-spike and large-spike wheat,providing parameters for crop growth model.Taking nitrogen as main treatment,irrigation and drought as two sub-treatments,multi-spike'Jimai 22'and large-spike'Lumai 21'were used as test materials,the data of canopy light distribution at booting stage,flowering stage and filling stage were measured by using American CI-110 canopy analyzer.The results showed that MLA of different types of winter wheat decreased first and then increased with the growth stage,and the TCRPvalue of'Lumai 21'was higher than that of'Jimai 22'at booting stage.With the increase of zenith angle,the TCRP value of irrigation or drought decreased in both cultivars,TCDP decreased first and then increased in two cultivars under different nitrogen,irrigation or drought conditions,and K value increased with the increase of zenith angle.Nitrogen application and irrigation promoted the canopy light distribution of winter wheat at booting stage.The leaf area index(LAI)and leaf inclination angle(MLA)were increased at booting stage by irrigation and increasing nitrogen fertilizer,TCRP value of spikelet-type varieties increased at 7.5° and 22.5° zenith angle,TCDP value of spikelet-type varieties increased at high n.When N was medium or low,TCDP decreased first and then increased,and K value increased with the increase of zenith angle.The nitrogen and water supply of winter wheat with multi-panicle type should be earlier than those with large panicle type,which is beneficial to rational canopy light distribution at booting stage.This study has guiding significance for higher yield of different types of winter wheat varieties under fertilizer and water management.
winter wheatbooting stagenitrogen application amountwater supplycanopy structurelight distributionextinction coefficient K
NETL
NSTL
万方数据
