Construction of Yield Equation of Winter Wheat Variety Tianxuan 57 under Wheat Stripe Rust Stress
Wheat stripe rust has always been a critical focus of wheat plant protection.In order to further clarify the correlation between the severity of wheat stripe rust in Longnan,Gansu,and winter wheat yield so as to provide scientific reference for setting control standards for wheat stripe rust in the Tianshui area,the local main winter wheat variety Tianxuan 57 was selected as the research object.After artificial induced inoculation,the disease gradient was caused by 1 to 2 times of spraying of 20% triadimefon emulsifiable concentrate at 135 g/ha mixed with 450 kg of water,and the field disease was investigated and measured after delivery.The regression equation between wheat stripe rust disease index(x)and yield(y1)of winter wheat variety Tianxuan 57 was obtained.The regression equation was y1=-8.571 4x2-488.57x+7512(R2=0.987 2).The theoretical yield calculation showed that when Tianxuan 57 was treated with 20% triadimefon emulsifiable concentrate for 1 time,the yield loss rate ranged from 20.13% to 29.71%,recovering 4.79 to 14.37 percentage points of yield loss.When treated with 2 times,the yield loss rate ranged from 7.35% to 12.14%,recovering 22.36 to 27.15 percentage points of yield loss.The calculation results showed that the contribution rate of plant protection for 1 time and 2 time application of 20% triadimefon emulsifiable concentrate were 6.82 to 18.00% and 25.45% to 29.31%,respectively.
Wheat stripe rustWinter wheatVarietyTianxuan 57Yield regression equationYield loss rateContribution rate of plant protection
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