2011
DOI: 10.1590/s1413-70542011000200015
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Resposta do arroz irrigado ao uso de inibidor de urease em plantio direto e convencional

Abstract: O objetivo do presente trabalho foi avaliar a volatilização de N-NH3 e a resposta do arroz irrigado ao uso de ureia com inibidor de urease em dois sistemas de cultivo, direto e convencional. Para tanto, desenvolveu-se um experimento em campo, no ano agrícola 2008/09, na UFSM em Santa Maria/RS. O delineamento utilizado foi de blocos ao acaso em esquema bifatorial (2x5), sendo o fator A constituído por ureia e ureia revestida com B e Cu (inibidor de urease) e o fator B composto por diferentes intervalos de entra… Show more

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Cited by 18 publications
(16 citation statements)
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“…Assim, o inibidor evita a alta concentração da forma amoniacal NH 4 + e o pH elevado na zona de aplicação do fertilizante, diminuindo a volatilização de NH 3 (Zaman et al, 2009;Dawar et al, 2011;Grohs et al, 2011;Stafanato et al, 2013).…”
Section: Resultsunclassified
“…Assim, o inibidor evita a alta concentração da forma amoniacal NH 4 + e o pH elevado na zona de aplicação do fertilizante, diminuindo a volatilização de NH 3 (Zaman et al, 2009;Dawar et al, 2011;Grohs et al, 2011;Stafanato et al, 2013).…”
Section: Resultsunclassified
“…Tabatabai (1977) reported an inhibitory effect of Cu +2 on urease activity in the soil, and that this effect was only lower than that of Ag + and Hg + . With the application of UBC, Grohs et al (2011) For the occurrence of volatilization losses, N must be in the form of NH 3 which, under normal temperature and pressure conditions, is in gaseous form due to its low boiling point (-38 °C). Ammonia is only formed when the pH of the medium is high, due to the removal of H + protons from ammonium.…”
Section: Resultsmentioning
confidence: 99%
“…With the aim of increasing the use efficiency of urea, several studies tested various polymers with different principles of action, urease and nitrification inhibitors Bhatia et al, 2010), rock dusts and organic compounds (Gioacchini et al, 2006;Kaoosi, 2007), micronutrients and some metals (Grohs et al, 2011), and sulfur (Girardi & Mourão Filho, 2004;Shaviv, 2005).…”
Section: Introductionmentioning
confidence: 99%
“…By data presented on Figure 4, it can be verified that height of rice plants, originating from seeds treated with Zn, B, and Mo has presented a linear, positive, and increasing behavior, showing such behavior as much in function of dosages ( Figure 4A) as for assessment period ( Figure 4B), being the dosage of 200 mL.100 kg -1 seed, the treatment that has presented the best performance, in relation to remaining treatments. Therefore, it is possible to infer that this result was due to the fact of Zn to be needed for tryptophan synthesis, an amino acid precursor of the indoleacetic acid (IAA), which is a hormone (auxin) promoter of growth in plants (Taiz and Zeiger, 2006); thus A B…”
Section: Resultsmentioning
confidence: 99%