1999
DOI: 10.1590/s0100-204x1999000900025
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Relationship between potassium fertilization and panicle blast severity in upland rice

Abstract: -The influence of K 2 O (0, 40, 80, 120 kg ha -1 ) at varying rates of N application (0, 30, 60 kg ha -1 ) at planting, on panicle blast (Pyricularia grisea (Cooke) Sacc.) was studied in a field experiment conducted during three consecutive years with the upland rice cultivar Douradão. Panicle blast severity decreased with increasing rates of potassium in the absence of nitrogen (N0). The relationship between panicle blast and K rates was quadratic at 30 kg ha -1 of nitrogen. Significant response to … Show more

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Cited by 8 publications
(13 citation statements)
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“…So for better management of disease a balanced combination of N and K should be applied. It is suggested that K:N ratio is more important than the effect of each individual nutrient in blast development [18].…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…So for better management of disease a balanced combination of N and K should be applied. It is suggested that K:N ratio is more important than the effect of each individual nutrient in blast development [18].…”
Section: Resultsmentioning
confidence: 99%
“…Sufficient K nutrition increases cell cuticle thickness, cell wall strength and production of phenols that ultimately implant resistance in crops [17]. Potassium fertilization greatly affected panicle blast development, the response being significantly linear and negative with increasing levels of potash [18]. Thus, disease incidence can be lowered by high K levels [19] [20].…”
Section: Introductionmentioning
confidence: 99%
“…Downy mildew severity was reduced significantly under low N as K rates increased while high infection was noticed under elevated doses of N and K. Interaction between N and K application relative to plant response against pathogens has also been ascertained for other fungal infections. Prabhu et al concluded that fertilization with increased K had significantly linear negative response on rice blast only in the absence of additional N [23]. It is well documented that plant reaction against attack of pathogens is influenced by nutrients availability and balanced nutrition [24,25].…”
Section: Sift Desk Discussionmentioning
confidence: 99%
“…The significant increase of the downy mildew disease at the higher K doses (500 to 700 mg L -1 ) could be explained by possible alterations in nutrient balance or the N: K ratio, as N and P were given to cucumber plants at fixed concentrations of 250 and 50 mg L -1 respectively. The N: K ratio was implicated in severity of many diseases caused by various plant pathogens [20,21]. Moreover, the importance of the K fertilizer type used on plant disease development has been discussed [20].…”
Section: Sift Deskmentioning
confidence: 99%