Nitrate Reductase, Micronutrients and Upland Rice Development as Influenced by Soil pH and Nitrogen Sources

Autor(es)

Moro, Edemar ^[1] ; Costa Crusciol, Carlos Alexandre ^[2] ; Nascente, Adriano Stephan ^[3] ; Cantarella, Heitor ^[4] ; Broetto, Fernando ^[5] ; Moro, Adriana Lima ^[1]

Afiliação do(s) autor(es)

^[1] Univ Oeste Paulista UNOESTE, Dept Agron, Campus 2, Presidente Prudente, SP - Brazil

^[2] Univ Estadual Paulista, Dept Prod Vegetal Agr, Fac Ciencias Agron, UNESP, Botucatu, SP - Brazil

^[3] Empresa Brasileira Pesquisa Agr, Embrapa Arroz & Feijao, Santo Antonio De Goias, Go - Brazil

^[4] Inst Agron Campinas, Ctr Solos & Recursos Ambientais, Campinas, SP - Brazil

^[5] Univ Estadual Paulista, Inst Biociencias, Dept Quim & Bioquim, UNESP, Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Communications in Soil Science and Plant Analysis; v. 48, n. 22, p. 2642-2651, 2017.
• Citações Web of Science: 2

Resumo

The average yield of upland rice under no-tillage system (NTS), a sustainable soil management, is lower than in conventional tillage (one plowing and two disking). One of the reasons given for this drop in crop grain yield would be the low-nitrate assimilation capacity of rice seedlings, due to the low activity of the nitrate reductase (NR) enzyme in the early development phase. A greenhouse experiment was conducted to evaluate the effects of the soil acidic and nitrogen source in the micronutrient concentrations, NR activity and grain yield of upland rice growing under NTS. The soil used in the experiment was an Oxisol. The experimental design was completely randomized in a factorial 3 x 4. Treatments consisted of three levels of soil acidity (high, medium, and low) combined with four nitrogen sources (nitrate, ammonium, ammonium + nitrification inhibitor, and control - without N fertilization). The reduction of soil acidity reduced the concentration of zinc and manganese in rice plants. Generally, the activity of the NR enzyme was higher in plants grown in soils with low acidity and fertilized with calcium nitrate. There was a greater response in growth and yield in rice plants grown in soils with high acidity. Under medium acidity, rice plants grown with ammonium sulfate were more productive (no differences were detected with the addition of the nitrification inhibitor). (AU)

• Processo FAPESP: 08/05641-6 - Plantas de cobertura e fontes de nitrogênio para o arroz de terras altas no sistema plantio direto
• Beneficiário: Carlos Alexandre Costa Crusciol
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/05573-0 - Plantas de cobertura e fontes de nitrogênio para o arroz de terras altas no sistema plantio direto
• Beneficiário: Edemar Moro
• Modalidade de apoio: Bolsas no Brasil - Doutorado