Impact of foliar diseases and its interaction with nitrogen fertilization and fungicides mixtures on green leaf area dynamics and yield in oat genotypes with different resistance

Dietz, Juan Ignacio; Schierenbeck, Matías; Simón, Marı́a Rosa

doi:10.1016/j.cropro.2019.03.017

Cited by 20 publications

(14 citation statements)

References 33 publications

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“…Dietz et al. (2019) had 1 yr with low disease pressure and 1 yr with high disease pressure; however, the year × N rate × fungicide interaction was not significant for grain yield while N and fungicide were both highly significant as main effects. Unfortunately there were only two N levels which make detection of a differential N response at different levels of disease severity between years and fungicide treatment very difficult.…”

Section: Resultsmentioning

confidence: 97%

“…(2019) in a year with a low level of disease severity was unable to lower the disease severity with a fungicide application. As expected when disease severity is moderate to high, fungicides are effective in reducing disease severity in oat (Dietz et al., 2019; May et al., 2014).…”

Section: Resultsmentioning

confidence: 98%

“…Dietz et al. (2019) reported a grain yield response in a year with higher disease severity and no response in a year with low disease severity. Other studies have found a larger response to fungicides with Mourtzinis et al.…”

Section: Resultsmentioning

confidence: 99%

“…When the genetic resistance is overcome or not incorporated into an oat cultivar a fungicide application can protect grain yield and quality. Fungicide applications have been used in various environments around the world to reduce grain yield loss from crown rust (Dietz, Schierenbeck, & Simón, 2019; Federizzi, Pacheco, & Nava, 2015; van Niekerk, Pretorius, & Boshoff, 2001). On the northern portion of the North American Great Plain, May et al.…”

Section: Introductionmentioning

confidence: 99%

“…Dietz et al. (2019) also investigated N fertilizers combined with fungicide protection programs but similarly observed no interaction between fungicide and N for grain yield. There is a dearth of research concerning the interaction between N and fungicide, and whether fungicide application can offset increased lodging and decreased test weights seen in oat crops when N rates are increased.…”

Section: Introductionmentioning

confidence: 99%

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Response of oat grain yield and quality to nitrogen fertilizer and fungicides

2020

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Recently agronomists and producers have expressed interest in combining higher nitrogen (N) rates with a fungicide application even when disease intensity is low. The objective of this study was to evaluate the effect of fungicide application and N rates on grain yield and oat quality (Avena sativa L.). The experimental design was a split plot with fungicide (none, pyraclostrobin, propiconazole + trifloxystrobin) as the main plot, and eight N rates as sub-plots (5, 20, 40, 60, 80, 100, 120, and 140 kg ha −1 ). This study was conducted in 2012 and 2013 at two locations in Saskatchewan, Melfort and Indian Head. Disease intensity was very low for crown rust (Puccinia coronata) and low-to-moderate for all other foliar diseases, and with no large effect on grain yield and quality. No interaction between fungicide and N was observed. A curvilinear increase in grain yield occurred as the N rate increased from 5 to 140 kg ha −1 . Increasing the N rate caused a small linear decrease in test weight. At a low oat price, $130 t −1 , the N rate that maximized economic return was sensitive to N fertilizer price. As the crop price increased the optimum N rate was100 kg ha −1 . In conclusion, our results indicate that using an N rate of 100 kg ha −1 provided the most consistent economic returns when the crop price is between $162 and $194 t −1 . There is no beneficial interaction between fungicide and N for growers using higher N rates at low disease intensity and resistant genotypes.

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Section: Resultsmentioning

confidence: 97%