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| Registros recuperados: 159 | |
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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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| Wekesa, E.; Mwangi, Wilfred; Verkuijl, Hugo; Danda, Milton Kengo; De Groote, Hugo. |
| Maize is the major food crop grown in the coastal region of Kenya and constitutes a major component of the diet of the population in the region. However, average yields are far below the potential for the region and low production levels create serious food deficits. Over the years, new technologies have been introduced but adoption has remained low, especially for fertilizer. This paper examined current maize-farming practices and technological and socioeconomic factors that influenced adoption in the Kilifi and Kwale Districts of the Coast Province, that together account for half of maize production in the region. The study found low adoption levels for improved maize varieties and technology, especially fertilizer, among farmers in the area. Farmers... |
| Tipo: Report |
Palavras-chave: Maize; Crops; Innovation adoption; Technology transfer; Food production; Production economics; Production factors; Plant breeding; Fertilizers; Yields; Kenya; Crop Production/Industries; E14; E16. |
| Ano: 2003 |
URL: http://purl.umn.edu/56109 |
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| Fuglie, Keith O.; Heisey, Paul W.; King, John L.; Day-Rubenstein, Kelly A.; Schimmelpfennig, David E.; Wang, Sun Ling. |
| Meeting growing global demand for food, fiber, and biofuel requires robust investment in agricultural research and development (R&D) from both public and private sectors. This study examines global R&D spending by private industry in seven agricultural input sectors, food manufacturing, and biofuel and describes the changing structure of these industries. In 2007 (the latest year for which comprehensive estimates are available), the private sector spent $19.7 billion on food and agricultural research (56 percent in food manufacturing and 44 percent in agricultural input sectors) and accounted for about half of total public and private spending on food and agricultural R&D in high-income countries. In R&D related to biofuel, annual... |
| Tipo: Technical Report |
Palavras-chave: Agricultural biotechnology; Agricultural chemicals; Agricultural inputs; Animal breeding; Animal health; Animal nutrition; Aquaculture; Biofuel; Concentration ratio; Crop breeding; Crop protection; Farm machinery; Fertilizers; Herfindahl index; Globalization; Market share; Market structure; Research intensity; Seed improvement; Productivity Analysis. |
| Ano: 2011 |
URL: http://purl.umn.edu/120324 |
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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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| 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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| Leme, Maristela Franco Paes; Zylbersztajn, Decio. |
| Transactions among agribusiness agents are not exclusively carried out on the market, being also governed by alternative types of institutional arrangements, some of which determined upon contractual agreement. In the fertilizers sector, the companies intensified the offer of input packages to farmers, more specifically to soybean producers, object of this article. In order to acquire the fertilizers, these producers may choose to use their own financial resources, to obtain resources through financing with third parties, or they may recur to the said packages, which include soybean and financial resources in addition to the fertilizers, referred by the soybean producers to as “exchange”, since they acquire fertilizer paying with soybean for future... |
| Tipo: Journal Article |
Palavras-chave: Institucional arragements; Bundling; Trust; Transation cost; Fertilizers; Uncertain.; Agribusiness; D23 e Q13. |
| Ano: 2008 |
URL: http://purl.umn.edu/61248 |
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| Rosado, Thiago Lopes; Gontijo, Ivoney; Almeida, Marcelo Suzart; Chambela Neto, Alberto; Simon, Carla Penha. |
| Nitrogen influences numerous physiological and morphological traits of forage grasses, which ultimately interfere directly with production and forage quality. Aimed to study was to evaluate the production of dry matter and the number of tillers of Panicum maximum cv. Mombaça grown with different sources and levels of applied nitrogen. The experiment was conducted at the Federal Institute of the Espírito Santo, Campus of Santa Teresa. The experimental design consisted of a randomised block design with three replicates in a 3 x 6 factorial design and three nitrogenous fertilizers (urea, ammonium sulphate and calcium nitrate), which were applied at six different levels (0, 120, 240, 360, 480 and 600 kg ha-1) during the experimental period, for a total of 54... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dry matter; Fertilizers; Panicum maximum. |
| Ano: 2016 |
URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/664 |
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| Ribeiro,Túlio Assunção Pires; Paterniani,José Euclides Stipp; Airold,Rogério Pereira da Silva; Silva,Marcelo Jacomini Moreira da. |
| Among the irrigation systems used today, trickle irrigation is one of the most efficient methods. This research, conducted by means of field tests, had the objective of comparing head loss evolution on water filtration with a disc filter (130 mum) and a non-woven synthetic fabric filter used in a drip irrigation system. The test consisted of fertirrigation with organic fertilizer, and chemical treatment of the water with sodium hypochlorite. Physical, chemical, and biological parameters were analyzed, such as: pH, turbidity, suspended solids, dissolved solids, EC, hardness, Langelier index, total iron, manganese, sulfides, algae, and bacteria. The water source used in this experiment was from an open reservoir, where an experimental trickle irrigation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drip irrigation; Filtration; Chlorine; Non-woven synthetic fabric; Fertilizers. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600001 |
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| Bonomelli,Claudia; Alcalde,Carolina; Aguilera,Camila; Videla,Ximena; Rojas-Silva,Ximena; Nario,Adriana; Fernandez,Victoria. |
| ABSTRACT: Calcium (Ca) is often supplied to crop species to prevent the occurrence of Ca–related disorders. Mechanisms of Ca absorption and transport are not fully understood and the effectiveness of root and/or foliar Ca fertilization may be variable. To characterize the rate of Ca absorption and transport, trials were developed with chili pepper and sweet cherry plants, using 45CaCl2 as a tracer. The Ca treatments supplied were: (1) No 45Ca (control); (2) 45Ca soil application; (3) 45Ca supply to basal leaves, and (4) 45Ca application to apical leaves. After two months, plants were harvested for biomass and Ca content determination. The recovery of 45Ca in different plant parts was measured with a liquid scintillation counter and leaf traits were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Fertilizer application methods; Horticultural crops; Plant nutrition; Radioisotopes. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601403 |
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| Matias,Filipe Inácio; Sabadin,José Felipe Gonzaga; Moreira,Lílian Angélica; Gomes,Marcos Henrique Feresin; Mira,Acácio Bezerra de; Fritsche-Neto,Roberto; Otto,Rafael. |
| ABSTRACT New apps have changed the traditional way of learning and teaching; they are also applied as a quickly executed and effective method in agriculture. Soil-app is a web application with a friendly click-point interface built through packages lodged in R software. The app is an advanced model of an open-source platform to support teaching and learning activities in soil analyses and fertilizer recommendations. Soil-app includes soil test interpretation, soil amendment calculations (lime and gypsum), the fertilizer rate for the most important crops in Brazil, an NPK blend calculator, and NPK blend evaluation. It also includes experimental statistical analysis as applied to soil science. Soil-app is a user-friendly and high-performance tool, garnering... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Software; Fertilizers; Recommendation; Prediction; Statistical analyses. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101404 |
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| Registros recuperados: 159 | |
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