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Ammonia volatilization from coated urea forms Rev. Bras. Ciênc. Solo
Nascimento,Carlos Antonio Costa do; Vitti,Godofredo Cesar; Faria,Letícia de Abreu; Luz,Pedro Henrique Cerqueira; Mendes,Fernanda Latanze.
Nitrogen fertilization is a major component of the cost of agricultural production, due to the high cost and low efficiency of fertilizers. In the case of urea, the low efficiency is mainly due to losses by volatilization, which are more pronounced in cultivation systems in which plant residues are left on the soil. The objective of this work was to compare the influence of urea coated with sulfur or boric acid and copper sulfate with conventional N fertilizers on N volatilization losses in sugar cane harvested after stubble burning. The sources urea, sulfur-coated urea, urea coated with boric acid and copper sulfate, as well as nitrate and ammonium sulfate, were tested at amounts containing N rates of 120 kg ha-1 N. The integration of new technologies in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Elemental sulfur; Boric acid; Copper sulfate; Sugarcane; Harvest without burning.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400022
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Avaliação de extratores de boro em solo cultivado com alfafa. Repositório Alice
MOREIRA, A.; MORAES, L. A. C.; SOUZA, J. A..
Apesar do limite de deficiência e toxidez do boro (B) ser na maioria das culturas estreita, na alfafa (Medicago sativa) a faixa utilizada para determinar o nível crítico é ampla, variando de 20 a 80 mg de B kg-1, porém, esses valores foram estabelecidos em condições de clima temperado e com cultivares diferentes da utilizada no Brasil. Este projeto tem por objetivo avaliar a eficiência de sete extratores na determinação da disponibilidade do B do solo correlacionando-os com a produtividade e teor foliar. Os experimentos foram realizados em condições de campo, em Latossolo Vermelho Amarelo distrófico, com duas fontes de B (ácido bórico e ulexita), duas saturações por base (60 e 80%) e cinco doses de B (0, 1, 3, 6 e 9 kg ha-1), em blocos ao acaso com quatro...
Tipo: Separatas Palavras-chave: Ácido bórico; Boro; Alfafa; Medicago Sativa.; Boric acid; Boron..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1044370
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Boron dynamics related to fruit growth and seed production in kiwifruit (Actinidia deliciosa, cv. Hayward) Ciencia e Investigación Agraria
Sotomayor,Carlos; Norambuena,Paulina; Ruiz,Rafael.
The effect of foliar boron treatments on fruit growth and seed development in Actinidia deliciosa, cv. Hayward, was studied. The distal leaves (BH) or fowers (BF) of a shoot were sprayed with 500 mg L-1 boric acid during the fowering period. The mobility of boron from the leaves to the fowers through the phloem was determined by spraying only the leaves. From 0 to 96 h after treatment, leaves and fowers were sampled and total boron was assessed. At harvest time, fruit weight and diameter plus seed weight and number were measured for the different treatments. The weight of fruits growing from shoots with boron-treated leaves were 14.1% higher than the control, while the weight of fruits derived from boron-treated fowers was 17% higher than that of fruits...
Tipo: Journal article Palavras-chave: Boric acid; Boron; Fruit weight; Kiwifruit; Seed number; Seed weight.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100013
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Evaluation of the use of wound-protectant fungicides and biological control agents against stem canker (Neofusicoccum parvum) of blueberry Ciencia e Investigación Agraria
Latorre,Bernardo A; Torres,René; Silva,Tatiane; Elfar,Karina.
B.A. Latorre, R. Torres, T. Silva, and K. Elfar. 2013. Evaluation of the use of wound-protectant fungicides and biological control agents against stem canker (Neofusicoccum parvum) of blueberry. Cien. Inv. Agr. 40(3): 537-545. Economically, blueberry (Vaccinium corymbosum) has become a very important fruit crop in Chile, and stem canker (Neofusicoccum parvum) has frequently been observed as a major disease. The symptoms are characterized by partial or total death of the foliage associated with extensive reddish-brown canker lesions at the base of the stems. Pruning wounds appear to be the main infection route. In this study, fungicide pastes and biological control agents were evaluated for their effectiveness as pruning wound-protectants against N. parvum....
Tipo: Journal article Palavras-chave: Botryosphaeria canker; Biological control; Boric acid; Ascorbic acid; Vaccinium corymbosum.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300007
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Histological Study on the Male Reproductive Organs of Mouse CF1 Treated With Boron International Journal of Morphology
Espinoza-Navarro,O; Vilaxa,A; Granifo,L; Rojas,S; Rodríguez,H.
Boric acid and borate are abundant in the nature and widely used in industrial, agricultural and cosmetology applications. However it is informed as toxic in a high dose. Residents of Arica-Chile with boron-rich geology deposits are regularly exposed to higher levels in drinking water in concentrations of 6. 0 and 12.0 mg/L. The objective of this study was to analyze the damage in the masculine reproductive apparatus of mouse CF1, exposed to boric acid in concentrations of 0.54; 2.0-6.0 and 12.0 mg/L, after 60 days of treatment. Male gonad segments were fixed in Bouin's solution for 6 hours and embedded in paraffin, longitudinal sections (5 mm) were processed for histology using the hematoxyline/eosin method. The results observed in treated animals...
Tipo: Journal article Palavras-chave: Boric acid; Spermatogenesis; Testicular atrophy; Mouse.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200017
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Hygroscopicity and ammonia volatilization losses from nitrogen sources in coated urea Rev. Bras. Ciênc. Solo
Faria,Letícia de Abreu; Nascimento,Carlos Antonio Costa do; Ventura,Barbara Paquier; Florim,Gabriela Perissinotto; Luz,Pedro Henrique de Cerqueira; Vitti,Godofredo Cesar.
Hygroscopic fertilizers tend to absorb moisture from the air and may have undesirable characteristics such as moistness, clumping and lower fluidity, hampering the application. The increasing use of urea is due to its numerous advantages, although this nitrogen (N) source is highly susceptible to volatilization losses, particularly when applied to the soil surface of management systems with conservation of crop residues. The volatilization losses can be minimized by slow or controlled-release fertilizers, with controlled water solubility of the urea-coating materials; and by stabilized fertilizers, which prolong the period during which N remains in the amide or ammonia forms by urease inhibitors. This study evaluated the hygroscopicity of and ammonia...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Boric acid; Sulfur; Crop residues; Copper sulphate.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300026
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Loss of ammonia from nitrogen fertilizers applied to maize and soybean straw Rev. Bras. Ciênc. Solo
Faria,Letícia de Abreu; Nascimento,Carlos Antonio Costa do; Vitti,Godofredo Cesar; Luz,Pedro Henrique de Cerqueira; Guedes,Elaine Maria Silva.
In Brazilian agriculture, urea is the most commonly used nitrogen (N) source, in spite of having the disadvantage of losing considerable amounts of N by ammonia-N volatilization. The objectives of this study were to evaluate: N lossby ammonia volatilization from: [urea coated with copper sulfate and boric acid], [urea coated with zeolite], [urea+ammonium sulfate], [urea coated with copper sulfate and boric acid+ammonium sulfate], [common urea] and [ammonium nitrate]; and the effect of these N source son the maize yield in terms of amount and quality. The treatments were applied to the surface of a soil under no-tillage maize, in two growing seasons. The first season (2009/2010) was after a maize crop (maize straw left on the soil surface) and the second...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Boric acid; Copper sulfate; Coated urea; Volatilization; Zeolite.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400014
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Use of Aspergillus niger in the bioleaching of colemanite for the production of boric acid Electron. J. Biotechnol.
Bayat,Oktay; Arslan,Volkan; Bayat,Belgin.
Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. In this study, chemical leaching and biological leaching methods were used for production of boric acid from colemanite (2CaO · 3B3O3 · 5H2O) (Emet-Kütahya, Turkey). Oxalic acid concentration, temperature, stirring time and solid-to-liquid ratio were taken as parameters in the chemical leaching process. It was found that the dissolution rate increases with increasing oxalic acid concentration and temperature but it decreases at higher solid-to-liquid ratios in the chemical leaching process. Using optimum conditions (d100 = 0.075 mm; 5% solids by weight; 0.55 M oxalic acid; 80 ± 2ºC...
Tipo: Journal article Palavras-chave: Aspergillus niger; Bioleaching; Boric acid; Chemical leaching; Colemanite; Oxalic acid.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300007
Registros recuperados: 8
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