Pyrenophora avenae, the causal agent of leaf blight is one of the serious diseases affecting oat crop grown for fodder and grain worldwide. Studying the interactions between different nitrogen (N) rates (0, 75, 100, 125 kg N ha−1) and SAR inducers (Beta-aminobutyric acid, chitosan, calcium chloride and potassium nitrate) under leaf blight outbreaks is of utmost importance to find out the best management option and optimum nitrogen rate for minimizing green fodder yield losses. Taking into account, this study was undertaken for two years to estimate the effects of different N rates and SAR inducers on leaf blight severity and green fodder yield of two genotypes at four growth stages (GS). Our results indicated a decrease in disease severity in treatment 75 kg N ha−1 by 4.1% and an increase in severity in 125 kg N ha−1 by 14.6% as compared to 0 kg N ha−1. There were significant differences for year, N rates and genotypes. Maximum disease severity was observed in 125 kg N ha−1 treatment (35.45%) and least in 75 kg N ha−1 (23.82%) as compared to 0 kg N ha−1 treatment (28.92%). Genotype × year and year × N × genotype interactions were significant as N levels affected the disease severities of both the genotypes over the years with 23.61 and 23.82% severity of OL 14 at 75 kg N ha−1 respectively with a significant increase in green fodder yield with an increase in N rates from 0 kg N ha−1 to 125 kg N ha−1. Significant differences in nutritional quality traits like dry matter content, crude protein, acid detergent fibre (ADF) and neutral detergent fibre (NDF) were also noticed at different N rates. An increase in dry matter content, and crude protein and a decrease in ADF and NDF were observed with an increase in N rates from 0 kg N ha−1 to 125 kg N ha−1. Among SAR inducers, application of Beta-aminobutyric acid and chitosan showed a significant reduction in the disease severity by 44.28 and 41.0% as compared to untreated control (52.85%) followed by treatment of chitosan with 29.32 and 27.81% increase in green fodder yield. These elicitors also showed enhancement in the nutritional quality traits of green fodder. Overall, the study underscores the dual benefit of SAR inducers in enhancing disease resistance and improving the nutritional value of green fodder of winter sown oat.

Interaction of SAR inducers and nitrogen for key fodder quality parameters and fodder yield under leaf blight infection in winter sown oat

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发表日期：

2025年12月17日

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Ramandeep Kaur,
Ashlesha Atri,
Anuradha,
Meenakshi Goyal

摘要

Pyrenophora avenae, the causal agent of leaf blight is one of the serious diseases affecting oat crop grown for fodder and grain worldwide. Studying the interactions between different nitrogen (N) rates (0, 75, 100, 125 kg N ha⁻¹) and SAR inducers (Beta-aminobutyric acid, chitosan, calcium chloride and potassium nitrate) under leaf blight outbreaks is of utmost importance to find out the best management option and optimum nitrogen rate for minimizing green fodder yield losses. Taking into account, this study was undertaken for two years to estimate the effects of different N rates and SAR inducers on leaf blight severity and green fodder yield of two genotypes at four growth stages (GS). Our results indicated a decrease in disease severity in treatment 75 kg N ha⁻¹ by 4.1% and an increase in severity in 125 kg N ha⁻¹ by 14.6% as compared to 0 kg N ha⁻¹. There were significant differences for year, N rates and genotypes. Maximum disease severity was observed in 125 kg N ha⁻¹ treatment (35.45%) and least in 75 kg N ha⁻¹ (23.82%) as compared to 0 kg N ha⁻¹ treatment (28.92%). Genotype × year and year × N × genotype interactions were significant as N levels affected the disease severities of both the genotypes over the years with 23.61 and 23.82% severity of OL 14 at 75 kg N ha⁻¹ respectively with a significant increase in green fodder yield with an increase in N rates from 0 kg N ha⁻¹ to 125 kg N ha⁻¹. Significant differences in nutritional quality traits like dry matter content, crude protein, acid detergent fibre (ADF) and neutral detergent fibre (NDF) were also noticed at different N rates. An increase in dry matter content, and crude protein and a decrease in ADF and NDF were observed with an increase in N rates from 0 kg N ha⁻¹ to 125 kg N ha⁻¹. Among SAR inducers, application of Beta-aminobutyric acid and chitosan showed a significant reduction in the disease severity by 44.28 and 41.0% as compared to untreated control (52.85%) followed by treatment of chitosan with 29.32 and 27.81% increase in green fodder yield. These elicitors also showed enhancement in the nutritional quality traits of green fodder. Overall, the study underscores the dual benefit of SAR inducers in enhancing disease resistance and improving the nutritional value of green fodder of winter sown oat.