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| Registros recuperados: 159 | |
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| Dayanatha, Jha; Behjat, Hojjati. |
| IN Sub-Sahara Africa, Which so far has benefited little from the green revolution. the adoption of high-yielding maize had great potential for closing the gap between food demand and supply. To bring about this transformation, fertilizer is essential for realizing the yield potential of hybrid maize while sustaining the fertility of Africa's fragile land. This study of Eastern Province, Zambia, shows that use of fertilizer on traditional varieties can also be a catalyst for agricultural growth. This work is part of an extensive body of research on adoption of new agricultural technology carried out by IFPRi in Asia and Africa. The study was undertaken in collaboration with several Zambia institutions, including the Rural Development Studies... |
| Tipo: Report |
Palavras-chave: Fertilizers; Zambia; Eastern province; Small Farms; Crop Production/Industries. |
| Ano: 1993 |
URL: http://purl.umn.edu/37967 |
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| Becegato,Valter Antonio; Ferreira,Francisco José Fonseca; Cabral,João Batista Pereira; Rafaelli Neto,Sílvio Luis. |
| In this study the K, U and Th radionuclide concentrations were determined in a sugar cane plantation that received large quantities of fertilizer and gypsum. Geochemical data were obtained for the clay, iron and organic matter in the soil samples, taken from depths of 0-20 and 20-40 cm. The average radionuclide concentrations were 71 Bq Kg-1 for K; 5.97 Bq Kg-1 for U, and 11.26 Bq Kg-1 for Th, and the uranium was variable (56%). The radionuclide average concentrations for the different fertilizer compositions varied in the range of 603.5 - 8855.0 Bq Kg-1 for K; 27.3 - 684.4 Bq Kg-1 for U, and 58 - 788.5 Bq Kg-1 for Th, and it was most variable for K (53%). Gypsum average concentrations were 82.6 Bq Kg-1 for K, 641.5 Bq Kg-1 for U, and 201.7 Bq Kg-1 for Th,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Soils; Radionuclides; Gamma-ray spectrometry. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100001 |
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| Hussain,Raad Obid; Hussain,Hayder Hamza. |
| In order to assess the radioactive level in the environment, the specific activities of 238U, 232Th and 40K were measured by using a gamma ray spectrometer based on a NaI(Tl) detector. The results showed that the specific activities of 238U, 232Th and 40K were 12.846-88.585, 1.304-26.656 and 11.598-2275.896 Bq/kg respectively. The radium equivalent activity was also calculated which varied from 0.893 to 175.244 Bq/kg. The radium equivalent average values were lower than the world average. In general, the highest level of radium equivalent value was in leafy type NPK fertilizers. The urea type had no radionuclide. The specific activity and absorbed dose rate at 1m above the ground surface (nGy/h) after NPK fertilizers agricultural applications were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Natural radioactivity; Gamma-spectrometry; Fertilizers. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400018 |
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| Oliveira,Mauro Wagner de; Trivelin,Paulo Cesar Ocheuze; Boaretto,Antônio Enedi; Muraoka,Taskashi; Mortatti,Jeferson. |
| A lysimeter experiment was carried out with sugarcane aiming to evaluate the leaching of nitrogen derived from either urea (15N) or the soil/sugarcane crop residues. The leaching of K+, Ca2+, and Mg2+ was also evaluated. The experiment was a factorial 2x4. The influencing factors were: firstly, the differential addition of two kinds of sugarcane remains to the soil, simulating conditions of cane- plantation renewal after the cane crop harvest, with and without previous straw removal by burning; secondly, four doses of N: 0, 30, 60, and 90 kg ha-1. During the experimental period the total volume of water received by the sugarcane-soil system was 2,015 mm, with 1,255 mm as precipitation and 760 mm as irrigation. The loss of N by leaching from the fertilizer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Mineral nutrients; Soil transport processes; Lysimeters. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000600016 |
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| Carvalho, Leandro Bernardino de. |
| Atualmente, dois dos grandes desafios com os quais o agronegócio brasileiro, responsável por aproximadamente 33% do PIB nacional (SECEX, 2005), se depara em seu constante crescimento são a alta dependência de produtos químicos (fertilizantes) para que sua fronteira agrícola se expanda e, conseqüentemente, as enormes distâncias (e custos de transportes) que essas fronteiras impõem para que sejam vencidas, tanto para o recebimento de insumos de produção, quanto para o fornecimento de seus produtos finais. Particularmente, a região Centro-Oeste brasileira, formada pelos Estados de Goiás, Mato Grosso, Mato Grosso do Sul e Distrito Federal, se enquadra em ambos os pontos – possui grandes fronteiras agrícolas a serem exploradas e, ao mesmo tempo, se localiza a... |
| Tipo: Presentation |
Palavras-chave: Logística; Transporte; Modelo matemático; Fertilizantes; Logistics; Transport; Mathematical model; Fertilizers; Agribusiness. |
| Ano: 2008 |
URL: http://purl.umn.edu/119008 |
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| Registros recuperados: 159 | |
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