Effect of Disease and Pest Control on Rice Yield in Relation to Various Combinations of Fertilizer Application

시비수준에 따른 병충해방제가 수도수량에 미치는 영향

  • Lee K. H. (Institute of Plant Environment, Office of Rural Development) ;
  • Lee E. J. (Institute of Plant Environment, Office of Rural Development) ;
  • Kim K. S. (Institute of Plant Environment, Office of Rural Development) ;
  • Chu W. J. (Institute of Plant Environment, Office of Rural Development) ;
  • Kim J. H. (Institute of Plant Environment, Office of Rural Development)
  • 이경휘 (농촌진흥청식물환경연구소) ;
  • 이은종 (농촌진흥청식물환경연구소) ;
  • 김광석 (농촌진흥청식물환경연구소) ;
  • 주원준 (농촌진흥청식물환경연구소) ;
  • 김정화 (농촌진흥청식물환경연구소)
  • Published : 1973.04.01

Abstract

The yield of rice is increased to amounts of fertilizer applied in paddy field but excessive application of fertilizer stimulates outbreaks of disease and insect pest. If, therefore, diseases and pests stimulated by excessive application of fertilizer would be effectively controlled, increaseed yield of rice would be possible. This experiment was conducted to determine the fertilizer application rate that would produce maximum yields when diseases and pests are controlled. 1. The fertilizer application rates and the incidence of leaf and apanicle blast were positively correlated at the $1\%$ level. 2, Without disease and pest control the maximum yield of hulled rice was 347-378kg/10a, which occurred at nitorgen application levels of 8.0-8.5 kg/10a. with effective control of diseases and pests the maximum yield of hulled was 453-462 kg/10a, which occurred at nitrogen application levels of 18.5-19.0 kg/10a. Yield increase at appropriate nitrogen levels by disease and pest control resulted in more than 100 kg/10a. 3. There was no significant yield difference between the NPK experimental plots with fixed PK levels and with varying PK levels. 4. The maximum effect of disease and pest .control as expressed biy yield index of hulled rice was $65\%$, the minimum effect was $30\%$, the average effects were $42-45\%$.

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