Plant growth regulator and nitrogen fertilizer effects on soil organic carbon sequestration in creeping bentgrass fairway turf |
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Authors: | Rafael J López-Bellido Rattan Lal Tom K Danneberger John R Street |
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Institution: | 1. Department of Ciencias y Recursos Agrícolas y Forestales, Universidad de Córdoba, Edificio C4 “Celestino Mutis”, Ctra. Madrid-Cádiz km 396, 14071, Córdoba, Spain 2. Carbon Management & Sequestration Centre, Ohio State University, Columbus, OH, 43210, USA 3. Department of Horticulture & Crop Science, Ohio State University, Columbus, OH, 43210, USA
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Abstract: | The objective of this study was to determine the effects of plant growth regulator (PGR) (no PGR, trinexapac-ethyl, and paclobutrazol) and N fertilizer (zero N, an average of 37 kg N ha?1 month?1, 6 and 12 kg N ha?1 week?1) on soil organic C (SOC) and soil N in creeping bentgrass (Agrostis stolonifera L.) fairway turf. After 4 years of field experiments soil samples were obtained from soil depths of 0–2.5, 2.5–5, 5–7.5, 7.5–10, 10–15, 15–20, and 20–30 cm. Soil bulk density, SOC, total N, NO 3 ? –N, and NH 4 + –N concentrations were determined. Paclobutrazol and trinexapac-ethyl application increased SOC. The 37 kg N ha?1 month?1 application increased SOC at the 0–2.5 cm depth with both PGRs. When paclobutrazol was used, N fertilizer always increased SOC; however, the greatest increase was observed with the 12 kg N ha?1 week?1 application when compared to other rates, inversely related to the NH 4 + –N concentration. Nitrogen application increased soil total N and NO 3 ? –N in the upper three depths. The application of PGRs and N fertilizer to creeping bentgrass fairway turf is an effective strategy for promoting C sequestration. |
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