Resposta do arroz irrigado ao suprimento de amônio e nitrato

Holzschuh, Marquel Jonas; Bohnen, Humberto; Anghinoni, Ibanor; Meurer, Egon José; Carmona, Felipe de Campos; Costa, Sérgio Ely Valadão Gigante de Andrade

doi:10.1590/s0100-06832009000500025

Cited by 22 publications

(19 citation statements)

References 36 publications

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“…These results are similar to those reported by Holzschuh et al (2009), who indicated differences between genotypes with respect to their ability to take up and accumulate N in the form of nitrate in shoots.…”

Section: Experiments II (Calcium Nitrate)supporting

confidence: 92%

“…D'Andrea et al (2004) and Santos et al (2011) have also reported that nitric N is important for initial growth. There is a hypothesis for different responses by distinct rice genotypes to N-NO 3 -and N-NH 4 + supply, and related studies are generally performed using a nutrient solution (ARAÚJO et al, 2012) or flooding (HOLZSCHUH et al, 2009). Therefore, the aim of this study was to evaluate the agronomic efficiency of nitrogen rates, nutrient absorption, and initial growth of upland rice genotypes originating from Brazil and Colombia when fertilized with nitric or ammoniacal sources.…”

Section: Introductionmentioning

confidence: 99%

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Rates of nitrogen from nitric and ammoniacal sources required by upland rice genotypes originating from Brazil and Colombia

Contreras

Barzan

et al. 2016

SCA

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The aim of this study was to evaluate the initial growth, nitrogen (N) uptake, and agronomic efficiency after the use of N fertilizers in upland rice cultivation. The experiment was conducted in a greenhouse by using pots filled with surface-layer (0 to 20 cm) soil collected from the municipality of Jaguapitã, Paraná. The experimental design was completely randomized with 4 replications. A factorial scheme of 5 × 2 was used, in which the factors were 5 N rates (0, 25, 50, 75, and 100 kg ha -1 N) and 2 cultivars of rice (Fedearroz Lagunas [Colombian] and ). The N sources tested were ammonium sulfate (Experiment I) and calcium nitrate (Experiment II). The following variables were evaluated: number of tillers per pot (NTP), dry mass of the shoots (DMS), N content in the dry mass (NCDM), and agronomic efficiency of N fertilizer (AEN). The data obtained in the experiments were evaluated using analysis of variance, and mean values were compared using Tukey's test at 5% significance for rice cultivar effects or adjusted to polynomial regression equations for N rates. Use of calcium nitrate yielded higher values of NTP, NCDM, and AEN. The cultivar Lagunas showed higher NTP, while IAPAR-9 showed higher DMS. An increase in N rates, for both sources, resulted in the increase of NTP, DMS, and NCDM; however, AEN was decreased. Key words: Ammonium sulfate. Calcium nitrate. Nitrogen fertilization. Oryza sativa. Upland. ResumoO objetivo do trabalho foi avaliar o crescimento inicial, absorção e eficiência agronômica de nitrogênio em cultivares de arroz fertilizado com doses de diferentes fontes de N. Os experimentos foram conduzidos em casa de vegetação, utilizando-se vasos preenchidos com terra coletada da camada superficial de 0 a 20 cm do município de Jaguapitã, Paraná. O delineamento experimental foi o inteiramente casualizado, com quatro repetições. Os tratamentos testados resultaram de um fatorial 5 x 2, em que os fatores foram cinco doses de N (0, 25, 50, 75 e 100 kg ha -1 de N) e dois cultivares de arroz (Fedearroz Lagunas (Colombiana) e IAPAR-9 (Brasileira)). Como fontes de nitrogênio foram testadas o sulfato de amônio (experimento I) e o nitrato de cálcio (experimento II). As seguintes variáveis foram avaliadas: número de perfilhos por vaso (NPV), massa seca da parte aérea (MSPA), conteúdo de nitrogênio na massa seca (CNMS) e eficiência agronômica do nitrogênio (EAN). Os dados obtidos nos experimentos foram submetidos a análises de variância e as médias comparadas pelo teste de Tukey a 5% para o efeito de cultivares ou ajustadas a equações de regressão polinomial para o efeito de doses de N. Com relação às fontes, o uso do nitrato de

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Section: Experiments II (Calcium Nitrate)supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Rates of nitrogen from nitric and ammoniacal sources required by upland rice genotypes originating from Brazil and Colombia

Contreras

Barzan

et al. 2016

SCA

View full text Add to dashboard Cite

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“…Arf et al (2001), Bordin et al (2003), Cazetta et al (2008) and Pacheco (2009) also obtained higher upland rice yield using millet as cover crop. This can be attributed to a better development of upland rice with low nitrate/ammonium ratio, in the first weeks of crop development (Lin et al, 2005;Li et al, 2007;Holzschuh et al, 2009;Poletto et al, 2011;Araújo et al, 2012). Millet provided the lowest amount of nitrate and the highest level of ammonium to the soil in almost all evaluations.…”

Section: Resultsmentioning

confidence: 91%

“…Araújo et al (2012) reported that upland rice plants have difficulty in metabolizing nitrate in the early development, since the production of nitrate reductase enzyme by this crop takes time to begin. This fact could explain the low initial rice development, when N-NO 3 -prevails in the environment, with negative effects on rice grain yield (Holzschuh et al, 2009), as observed in treatments with U. brizantha, U. ruziziensis and P. maximum. (1) Means followed by equal letters do not differ by LSD test, at 5% probability.…”

Section: Resultsmentioning

confidence: 99%

“…However, Lin et al (2005), Li et al (2007), Holzschuh et al (2009), Poletto et al (2011 and Araújo et al (2012) showed that upland rice perform best when NH 4 + is predominant during the initial development of plants. However, these authors warn that the exclusive availability of ammonium can be detrimental for rice plants, and ranges around to 50-75% nitrate and 50-25% ammonium provide better upland rice performance.…”

Section: Introductionmentioning

confidence: 96%

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Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Nascente

Crusciol

Cobucci

2012

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effect of cover crops and their desiccation times on upland rice yield and on the levels of nitrate and ammonium in a no-tillage soil. The experiment was carried out in a randomized blocks, with split plots and three replicates. Cover crops (plots) were sowed in the offseason (March 2009). In November 2009, at 30, 20, 10 and 0 days before rice sowing (split plots), herbicide was applied on the cover crops (fallow, Panicum maximum, Urochloa ruziziensis, U. brizantha and millet). Straw and soil were sampled (0-10 cm) at the sowing day, and after 7, 14, 21, 28 and 35 days. Straws from millet and fallow were degraded more rapidly and provided the lowest level of nitrate in the soil. Urochloa ruziziensis, U. brizantha and P. maximum produced higher amounts of dry matter, and provided the highest levels of nitrate in the soil. Millet provides the lowest nitrate/ammonium ratio and the highest upland rice yield. Desiccations carried out at 30 and 20 days before sowing had the largest levels of nitrate in the soil at the sowing date. Nitrogen content and forms in the soil are affected by cover crops and their desiccation times.Index terms: Oryza sativa, Panicum maximum, Urochloa brizantha, Urochloa ruziziensis, millet, nitrogen. Amônio e nitrato no solo e produtividade do arroz de terras altas influenciados por plantas de cobertura e suas épocas de dessecaçãoResumo -O objetivo deste trabalho foi avaliar o efeito de plantas de cobertura e de suas épocas de dessecação na produtividade do arroz de terras altas e nos níveis de nitrato e amônio de solo em plantio direto. O experimento foi realizado em blocos ao acaso, com parcelas subdivididas e três repetições. As plantas de cobertura (parcelas) foram semeadas na entressafra (março de 2009). Em novembro de 2009, aos 30, 20, 10 e 0 dias antes da semeadura do arroz (parcelas subdivididas), realizou-se o manejo químico das plantas de cobertura (pousio, Panicum maximum, Urochloa ruziziensis, U. brizantha e milheto). As palhadas e o solo (camada 0-10 cm) foram amostrados no dia da semeadura do arroz e após 7, 14, 21, 28 e 35 dias. As palhas do milheto e do pousio degradaram-se mais rapidamente e proporcionaram os menores níveis de nitrato ao solo. Urochloa ruziziensis, U. brizantha e P. maximum produziram mais matéria seca e proporcionaram os maiores níveis de nitrato no solo. O milheto proporciona menor relação nitrato/amônio no solo e maior produtividade do arroz. A dessecação aos 30 e 20 dias da semeadura do arroz proporciona os maiores níveis de nitrato no solo, na data de plantio. O conteúdo e a forma do nitrogênio no solo são afetados pelas plantas de cobertura e por suas épocas de dessecação.

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Soil solution chemical attributes, rice response and water use efficiency under different flood irrigation management methods

Borin

Carmona

Anghinoni

et al. 2016

Agricultural Water Management

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Resposta do arroz irrigado ao suprimento de amônio e nitrato

Abstract: RESUMO

Cited by 22 publications

References 36 publications

Rates of nitrogen from nitric and ammoniacal sources required by upland rice genotypes originating from Brazil and Colombia

Rates of nitrogen from nitric and ammoniacal sources required by upland rice genotypes originating from Brazil and Colombia

Ammonium and nitrate in soil and upland rice yield as affected by cover crops and their desiccation time

Soil solution chemical attributes, rice response and water use efficiency under different flood irrigation management methods

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