Abstract:Reports of sulfur (S) deficiency symptoms in corn (Zea mays L.) fields of the Red River Valley of North Dakota and Minnesota are increasing. Current soil tests cannot predict the availability of S correctly due to the presence of gypsum in soils of this region. Field trials were conducted to determine corn yield and S uptake response to incremental applications of S (0, 11, 22, 33, and 44 kg S ha–1) in the form of ammonium sulfate [(NH4)2SO4]. Corn yield and S uptake varied significantly between sites. Out of … Show more
“…Historically, this scarcity was attributed to the widespread perception of an abundant natural supply, as indicated by the absence of positive responses to S additions (Dick et al, 2008). However, cases of crop S deficiencies have started to multiply in several parts of the world in the last two decades, which has led to an increasing demand among farmers for S testing methods (Goyal et al, 2021;Kovar & Grant, 2011;Mahal et al, 2022; see also Fleuridor et al, 2023). Reduced atmospheric deposition of anthropogenic S, increasing use of N and P fertilizers without S impurities, soil impoverishment, and increased crop demand and export of S have been identified as the main causes of this change in trend (Scherer, 2009;Webb et al, 2016).…”
Soil fertility diagnosis often omits subsoil measurements, impacting precision. Our objective was to compare the vertical distribution of nitrate and sulfate in agricultural Mollisols. Both anions were measured in 34 Mollisols of the Pampean region (Argentina) sampled to 160‐cm depth at 20 cm intervals. Nitrate exhibited a continuous downward trajectory, with maximum values at 0–20 cm (12.7 mg N kg−1) and minimum values at 140–160 cm (3.3 mg N kg−1). Sulfate displayed a sinuous pattern, with a minimum at 60–80 cm (3 mg S kg−1). The 60–160/0–160 cm concentration ratio was 42% for nitrate and 60% for sulfate, indicating greater topsoil stratification for nitrate. Predicting deep‐layer nitrate concentrations from topsoil data was more accurate than for sulfate. This poses a challenge for assessing soil S bioavailability, as subsoil sulfates go undetected in conventional sampling.
“…Historically, this scarcity was attributed to the widespread perception of an abundant natural supply, as indicated by the absence of positive responses to S additions (Dick et al, 2008). However, cases of crop S deficiencies have started to multiply in several parts of the world in the last two decades, which has led to an increasing demand among farmers for S testing methods (Goyal et al, 2021;Kovar & Grant, 2011;Mahal et al, 2022; see also Fleuridor et al, 2023). Reduced atmospheric deposition of anthropogenic S, increasing use of N and P fertilizers without S impurities, soil impoverishment, and increased crop demand and export of S have been identified as the main causes of this change in trend (Scherer, 2009;Webb et al, 2016).…”
Soil fertility diagnosis often omits subsoil measurements, impacting precision. Our objective was to compare the vertical distribution of nitrate and sulfate in agricultural Mollisols. Both anions were measured in 34 Mollisols of the Pampean region (Argentina) sampled to 160‐cm depth at 20 cm intervals. Nitrate exhibited a continuous downward trajectory, with maximum values at 0–20 cm (12.7 mg N kg−1) and minimum values at 140–160 cm (3.3 mg N kg−1). Sulfate displayed a sinuous pattern, with a minimum at 60–80 cm (3 mg S kg−1). The 60–160/0–160 cm concentration ratio was 42% for nitrate and 60% for sulfate, indicating greater topsoil stratification for nitrate. Predicting deep‐layer nitrate concentrations from topsoil data was more accurate than for sulfate. This poses a challenge for assessing soil S bioavailability, as subsoil sulfates go undetected in conventional sampling.
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