A Study on Increasing Resistance to Tobacco Brown Spot(Alternaria alterhata)by Cultivated Measures

doi:10.3321/j.issn:1000-7091.1996.04.012

Abstract

Abstract: Using the commutative combination design of quadratic regression,the quantitative relationship between the disease index of tobacco brown spot and comprehensive farming measures(transplanting-date X₁;the application of cake fertilizer X₂;the application of potassium fertilizerX₃)was studied during 1994 in Yuzhou county, Henan province.The results showed that the relationship between disease index and transplanting date(X₁) can be expressed aparabola of maxinum.By changing transplanting date in order to avoid the epidem is season, disease level could be decreased. With increasing amount of cake fertilizer(X₂)and potassium fertilizer (X₃),the disease index also be reduced A mathem aticm odelof relation between disease index and farming measures was set up Y= 19.185+0.853X₁-0.847X₂-0 .640X₃+0.8X₁X₃+1.8X₂X₃-3.17X₁²-1.407X₂²-0.912X₃². According to this model,the best measure cambinations were found out.

Key words: Tobacco brown spot, Transplanting date, Cake fertilizer, Potassium fertilizer

CLC Number:

S474

Zhang Zhencheng, Sun Qing, Wu Qing, Yan Shengfu, Li Yanshan. A Study on Increasing Resistance to Tobacco Brown Spot(Alternaria alterhata)by Cultivated Measures[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1996, 11(4): 58-62. doi: 10.3321/j.issn:1000-7091.1996.04.012.

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