The effects of silicate, nitrogen, phosphorous and potassium fertilizers on the chemical components of rice plants and on the incidence of blast disease of rice caused by Pyricularia oryzae Cavara

Paik, S.B.

Korean Journal of Plant Protection 14(3): 97-109


Accession: 000538458

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Applications of silicate fertilizers reduced the incidence of blast disease while superfluous N and P rendered rice more susceptible. Increased K had no effect on increased resistance when the leaf blades were already rich in K. When 4 rice cvs. were inoculated with 3 strs. of P. oryzae, blast was most severe on Pungok, least on Jinheung and intermediate on Pungkwang and Paltal. Blast was most severe on the 2nd leaf from the top and least on the top regardless of fertilizer levels when seedlings were inoculated at the 5-6 leaf stage. The 3 strs. varied in pathogenicity in the order P1, P2 and P3 on the cvs. Jinheung, Paltal and Pungkwang but not on Pungok.