Effects of sulfur-coated urea on California annual grassland yield and chemical composition. Vaughn, C. E., Jones, M. B., & Ruckman, J. E. Agron. J., 71(2):297–300, 1979. abstract bibtex Abstract: Fall applications of N fertilizers on California annual grasslands are often accompanied by luxury N uptake, excessive N leaching losses, and N deficiencies the following spring. Sulfur-coated urea (SCU), a slow-release fertilizer, was applied to a grassland soil (Laughlin, fine-loamy, mixed mesic, Ultic Haploxeroll) to determine whether it could supply adequate N and S and eliminate problems encountered with more soluble N fertilizers. Urea (U), urea with 100-mesh elemental S (U + S), and two formulations of SCU were broadcast on resident annual grassland, dominated by annual bromes (Bromus spp.), wild oats (Avena barbata), broadleaf filaree (Erodium botrys), and clover (Trifolium spp.), in a climate with cool, rainy winters, and hot, dry summers. Forage yield and N and S uptake were measured seasonally in the first year and annually the following five years. Seasonal growth distribution was similar from all fertilizers in the first year. However, U + S was significantly more productive and gave greater herbage S uptake than the SCU's and U throughout the first growing season, and greater N uptake in the first winter. Residual studies suggested the long-term benefit of S fertilization; the U + S and SCU treatments were significantly more productive for the last five years. Residual N uptake responses were similar to the yields. Herbage S uptake was similar in the U and check treatments for the entire study. The more heavily coated SCU formulation gave greater S uptake than both U + S treatments in the fourth and sixth years after application. It was concluded that the SCU's were of no greater benefit than urea combined with fine S in fertilizing California annual grasslands. The slow release of N from SCU did not give any greater apparent residual N response. There was a long-term response to the larger particles of S in SCU, but it is questionable that this would justify the extra cost of the fertilizer.
@article{vaughn_effects_1979,
title = {Effects of sulfur-coated urea on {California} annual grassland yield and chemical composition},
volume = {71},
shorttitle = {Effects of sulfur-coated urea on {California} annual grassland yield and chemical composition},
abstract = {Abstract: Fall applications of N fertilizers on California annual grasslands are often accompanied by luxury N uptake, excessive N leaching losses, and N deficiencies the following spring. Sulfur-coated urea (SCU), a slow-release fertilizer, was applied to a grassland soil (Laughlin, fine-loamy, mixed mesic, Ultic Haploxeroll) to determine whether it could supply adequate N and S and eliminate problems encountered with more soluble N fertilizers. Urea (U), urea with 100-mesh elemental S (U + S), and two formulations of SCU were broadcast on resident annual grassland, dominated by annual bromes (Bromus spp.), wild oats (Avena barbata), broadleaf filaree (Erodium botrys), and clover (Trifolium spp.), in a climate with cool, rainy winters, and hot, dry summers. Forage yield and N and S uptake were measured seasonally in the first year and annually the following five years. Seasonal growth distribution was similar from all fertilizers in the first year. However, U + S was significantly more productive and gave greater herbage S uptake than the SCU's and U throughout the first growing season, and greater N uptake in the first winter. Residual studies suggested the long-term benefit of S fertilization; the U + S and SCU treatments were significantly more productive for the last five years. Residual N uptake responses were similar to the yields. Herbage S uptake was similar in the U and check treatments for the entire study. The more heavily coated SCU formulation gave greater S uptake than both U + S treatments in the fourth and sixth years after application. It was concluded that the SCU's were of no greater benefit than urea combined with fine S in fertilizing California annual grasslands. The slow release of N from SCU did not give any greater apparent residual N response. There was a long-term response to the larger particles of S in SCU, but it is questionable that this would justify the extra cost of the fertilizer.},
number = {2},
journal = {Agron. J.},
author = {Vaughn, Charles E. and Jones, Milton B. and Ruckman, J. E.},
year = {1979},
keywords = {1979, Avena barbata, Bromus spp., Erodium botrys, Jones, M. B., Ruckman, J. E., Trifolium spp., Vaughn, C. E., clovers, deficiency, nitrogen, fertilization, nitrogen, fertilization, sulfur, filaree, broadleaf, forage production, grassland, annual, herbage production, leaching, nitrogen, nitrogen deficiency, nitrogen fertilizer, nutrient analysis, plant, oats, wild, soil, Laughlin loam, sulfur fertilizer, urea, urea, sulfur-coated, yield, herbage},
pages = {297--300}
}
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Urea (U), urea with 100-mesh elemental S (U + S), and two formulations of SCU were broadcast on resident annual grassland, dominated by annual bromes (Bromus spp.), wild oats (Avena barbata), broadleaf filaree (Erodium botrys), and clover (Trifolium spp.), in a climate with cool, rainy winters, and hot, dry summers. Forage yield and N and S uptake were measured seasonally in the first year and annually the following five years. Seasonal growth distribution was similar from all fertilizers in the first year. However, U + S was significantly more productive and gave greater herbage S uptake than the SCU's and U throughout the first growing season, and greater N uptake in the first winter. Residual studies suggested the long-term benefit of S fertilization; the U + S and SCU treatments were significantly more productive for the last five years. Residual N uptake responses were similar to the yields. Herbage S uptake was similar in the U and check treatments for the entire study. The more heavily coated SCU formulation gave greater S uptake than both U + S treatments in the fourth and sixth years after application. It was concluded that the SCU's were of no greater benefit than urea combined with fine S in fertilizing California annual grasslands. The slow release of N from SCU did not give any greater apparent residual N response. There was a long-term response to the larger particles of S in SCU, but it is questionable that this would justify the extra cost of the fertilizer.","number":"2","journal":"Agron. J.","author":[{"propositions":[],"lastnames":["Vaughn"],"firstnames":["Charles","E."],"suffixes":[]},{"propositions":[],"lastnames":["Jones"],"firstnames":["Milton","B."],"suffixes":[]},{"propositions":[],"lastnames":["Ruckman"],"firstnames":["J.","E."],"suffixes":[]}],"year":"1979","keywords":"1979, Avena barbata, Bromus spp., Erodium botrys, Jones, M. B., Ruckman, J. E., Trifolium spp., Vaughn, C. 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