Importance of the nitrogen source in the grass species Brachiaria brizantha responses to sulfur limitation |
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Authors: | Fabiano Daniel De Bona Fabiana Schmidt Francisco Antonio Monteiro |
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Institution: | 1. Soil Science Department, ESALQ - University of S?o Paulo, Piracicaba, SP, Brazil 2. National Wheat Research Center - Embrapa Trigo, PO Box 451, Passo Fundo, RS, 99001-970, Brazil
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Abstract: | Background and aims Plant responses to S supply are highly dependent on N nutrition. We investigated the effect of S status on metabolic, nutritional, and production variables in Brachiaria brizantha treated with different N forms. Additionally, 15N and 34S root influx were determined in plants under short- and long-term S deprivation. Methods Plants were submitted to soil fertilization treatments consisted of combinations of N forms without N, ammonium (NH4 +), nitrate (NO3 ?) or NH4 ++NO3 ?] at S rates (0, 15, 30, or 45 mg dm?3). N and S influx capacity was determined in hydroponically-grown plants. Results Shoot production due to S supply increased 53, 145 and 196 % with NH4 +, NH4 ++NO3 ? and NO3 ? treatments, respectively. No or low S impaired protein synthesis and led to high accumulation of N-NO3 ? and asparagine in NO3 ?-fed plants, both alone and with NH4 +. Proline accumulation was observed in NH4 +-fed plants. Short- and long-term S deprivation did not promote considerable changes in 15N influx. 34S absorption decreased depending on the N form provided: NH4 ++NO3 ? > only NH4 + > only NO3 ? > low N. Conclusions Including both NH4 + and NO3 ? forms in fertilizer increases N and S intake potential and thereby enhances plant growth, nutritional value and production. |
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