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Search Results: 1 - 10 of 15 matches for " Edinalvo Rabaiolli; "
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Consumo de água e perdas de nutrientes e de sedimentos na água de drenagem inicial do arroz irrigado
Machado, Sérgio Luiz de Oliveira;Marchezan, Enio;Righes, Afranio Almir;Carlesso, Reimar;Villa, Silvio Carlos Cazarrotto;Camargo, Edinalvo Rabaiolli;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000100010
Abstract: in rio grande do sul, brazil, irrigated rice fields use large amount of water and have the potential of contaminate surface water bodies when drainage is performed. the objective of this experiment was to quantify the amount of water in flooded rice fields under different cropping systems (experiment i) and to measure the concentration of nutrients in the initial drainage water of pre-germinated, pre-germinated mix and seedling transplanting systems (experiment ii). the research was conducted during 2000/01 and 2001/02 (experiment i) and during 1999/00, 2000/01 and 2001/02 (experiment ii) in a lowland area of a planosoil located at the federal university of santa maria-rs, brazil. in the years 2000/01 and 2001/02 (experiment i) five cropping systems (conventional, minimum tillage, pre-germinated, mix of pre-germinated and seedling transplanting) randomized block experimental design with four replications were used. the cropping systems did not influence the use of water by flooded rice, varying from 5,431 to 6,422 and 5,347 to 5,852m3 ha-1 for the years 2000/01 and 2001/02, respectively. the amount of water used for flooding the soil in the pre-germinated and seedling transplanting systems or form stablishing a layer of water in the mix pre-germinated was 1,285m3 ha-1. in experiment ii, three cropping systems (pre-germinated, mix of pre-germinated and seedling transplanting) were compared. nitrate, phosphorus and magnesium concentrations in the initial drainage water were similar in the different cropping systems. in the mix of pre-germinated system, ammonium and potassium concentrations were higher when compared with the pre-germinated and seedling transplanting systems with averages of 3.85 and 7.70mg l-1, respectively. recorded nutrient losses were within the range allowed by the currente legislation. the concentration of sediments in the drainage water was lower in the mix of pre-germinated system when compared to pre-germinated and seedling transplanting system
Manejo dos fertilizantes fosfatados e potássicos em arroz irrigado no sistema pré-germinado
Marchezan, Enio;Camargo, Edinalvo Rabaioli;Segabinazzi, Tommi;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000200005
Abstract: in pregerminated rice system, initial water drainage promotes nutrient losses, depending on fertilizer management, leading to environmental problems. during the 2000/01 and 2003/04 growing seasons experiments were conducted at universidade federal de santa maria aiming to evaluate the effect of phosphorus and potassium fertilizer application methods on nutrient losses and pregerminated rice grain yield. the treatments were seven phosphorus and potassium fertilization methods combining application time and incorporated or not incorporated. phosphorus and nitrogen concentration measured at initial water drainage were not affected by time or method of fertilizer application. the average of phosphorus and nitrogen were 0.07 and 0.81 mg l-1 respectively. however, less potassium runoff was verified in the treatments where the fertilizer was applied 10 and 30 days after sowing as well as on the check treatment. the treatments tested did not affect the rice agronomic traits. rice yield was not affected by the phosphorus and potassium fertilization timing and method of application, but when the permanent flooding is not kept on the phosphorus and potassium application need to be done after the initial drainage to reduce potassium losses.
Análise de coeficiente de trilha para os componentes de produ??o em arroz
Marchezan, Enio;Martin, Thomas Newton;Santos, Fernando Machado dos;Camargo, Edinalvo Rabaioli;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000500007
Abstract: eighty eight rice genotypes were evaluated during four years aiming to study the relationship among yield components. in each year, the experimental design was a completely randomized block design with four replications and the variables studied were: plant height, seed yield, spikelet sterility, number of seeds per panicle, 1000 seeds weight and head grains. the estimation of correlations and the path coefficient analysis were conducted with the genes software. the genotypes showed significant variability for all the variables analyzed within each one of years. it was concluded that variable selection must be carried out among the cultivars that are more similar and using a greater number of variables allows better inferences about rice yield components. grain weight was the yield of component that most affected seed yield rice plants.
Popula??o de plantas, dose de nitrogênio e aplica??o de fungicida na produ??o de arroz irrigado: I-características agron?micas
Marzari, Victor;Marchezan, Enio;Silva, Leandro Souza da;Camargo, Edinalvo Rabaioli;Teló, Gustavo Mack;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000200006
Abstract: a field experiment was aimed at evaluating the effects of plant densities, nitrogen rates and chemical disease control on agronomic characteristics that affect grain yield of irrigated rice. the study was conducted during 2003/2004, in the departamento de fitotecnia of universidade federal de santa maria. the experiment was arranged in randomized blocks with sub-plots and four replicates, in santa maria-rs, brazil and the treatments were: three plant densities (150, 260 and 380plants m-2), five nitrogen rates (0, 40, 80, 120 and 160kg ha-1) with and without chemical foliar disease control. the nitrogen was dressing was twice split at initial tillering and panicle differentiation. grain yield increased in a quadratic fashion in response to nitrogen rates to up to 97kg ha-1. the use of fungicides to control foliar diseases resulted in higher grain yelds regardless of plant population or nitrogen fertilizer rates. irrigated rice can compensate yield components between 150 and 380plants m-2. the most efficient rate of nitrogen was 97kg ha-1. chemical foliar diseases control increases irrigated rice productivity even at low disease incidence.
Desempenho do arroz irrigado em resposta à utiliza o de cianobactérias fixadoras de nitrogênio = Performance of paddy rice in response to the use of nitrogen-fixing cyanobacteria
Enio Marchesan,Fernando Machado dos Santos,Luis Antonio de Avila,Edinalvo Rabaioli Camargo
Acta Scientiarum : Agronomy , 2007,
Abstract: O objetivo do presente estudo foi avaliar a utiliza o de inóculos decianobactérias fixadoras de nitrogênio como alternativa à aduba o química de nitrogênio na cultura do arroz irrigado. Para tanto, foram conduzidos quatro experimentos, nos anos agrícolas de 1999/00 a 2002/03, avaliando os tratamentos: testemunha sem aplica o de N em cobertura; 20 kg ha-1 de N aplicado em cobertura; 40 kg ha-1 de N aplicado em cobertura; 90 kg ha-1 de N aplicado em cobertura; 50 g ha-1 de Rizogram ; 100 g ha-1 de Rizogram . Verificou-se intera o dos tratamentos com os anos avaliados, o que pode ter ocultado o desempenho destes. Além disso, verificou-se que, para a variável “número de gr os por panícula”, a utiliza o de cianobactérias nas duas dosagens estudadas (50 e 100 g ha-1) produziu resultados semelhantes à aduba o nitrogenada (90 kg ha-1), com potencialredu o do número porcentual de espiguetas estéreis. Os tratamentos n o afetaram o rendimento de gr os do arroz irrigado, devido às varia es ambientais dos anos avaliados. A four-year experiment irrigated rice was carried out in order to evaluate the performance of Nostoc sp. and Tolypothrix sp. nitrogen-fixing cyanobacteria strains (Rizogram ), as an alternative to chemical nitrogen fertilization in irrigated rice. The treatments evaluated in the experiments included: control without top dressing Napplication; top dressing application of 20, 40 and 90 kg ha-1; 50 g ha-1 of Rizogram , and 100 g ha-1 of Rizogram . It was verified interaction between the years of the study and the treatments, which may have affected the performance of these treatments. Moreover, it was observed that, for the number of grains per panicle, the use of cyanobacteria in two studied rates (50 e 100 g ha-1) produced the same results as the nitrogen fertilization (90 kg ha-1), showing potential reduction of sterile spikelets. However, the treatments did not affected rice grain yield.
Desempenho de genótipos de arroz irrigado cultivados no sistema pré-germinado com inunda o contínua
Marchezan Enio,Camargo Edinalvo Rabaioli,Lopes Sérgio Ira?u Gindri,Santos Fernando Machado dos
Ciência Rural , 2004,
Abstract: No sistema pré-germinado de cultivo do arroz irrigado, adota-se o manejo de retirada da água da lavoura, aproximadamente aos três dias após a semeadura, objetivando melhor estabelecimento das plantulas. No entanto, esta prática acarreta perda de água e nutrientes, além da reinfesta o com plantas daninhas. A permanência da lamina de água na lavoura, durante todo o ciclo da cultura, seria uma proposta de manejo capaz de minimizar estes problemas. Sendo assim, objetivou-se avaliar o desempenho de genótipos de arroz irrigado, quando submetidos ao cultivo em lamina contínua, especialmente quanto ao acamamento de plantas, aspecto considerado limitante neste manejo de irriga o. Para tal, nos anos agrícolas de 2000/01 a 2002/03, foram conduzidos experimentos em área de várzea sistematizada, em solo classificado como Planossolo Hidromórfico eutrófico arênico. Os tratamentos foram compostos por 8, 12 e 15 genótipos no primeiro, segundo e terceiro ano, respectivamente. No ano 1, a produtividade média foi de 7279kg ha-1, sendo o genótipo IRGA 1572-11-1F-1-4-4 (8297kg ha-1) o mais produtivo em valores absolutos. A porcentagem de acamamento variou entre 0 e 60% e a maioria dos tratamentos situou-se entre 0-20%. Todos os genótipos exibiram acamamento de plantas, exceto El Paso L 144. No ano 2, a produtividade média foi de 8492kg ha-1 e o genótipo BRS-Pelota o mais produtivo (9282kg ha-1), n o tendo sido verificado acamamento em nenhum dos genótipos. No ano 3, a produtividade média foi de 6202kg ha-1 e esteve relacionada à elevada porcentagem de plantas acamadas decorrente de intempéries climáticas, ocorridas na fase de matura o. Constatou-se que a produtividade dos genótipos pode ser elevada neste manejo de irriga o, mas o acamamento de plantas limita o potencial produtivo, dependendo das condi es ambientais e do genótipo utilizado.
Análise de coeficiente de trilha para os componentes de produ o em arroz
Marchezan Enio,Martin Thomas Newton,Santos Fernando Machado dos,Camargo Edinalvo Rabaioli
Ciência Rural , 2005,
Abstract: Com o objetivo de avaliar a influência dos componentes de produ o de arroz no rendimento de gr os através da análise de trilha, avaliaram-se 88 genótipos de arroz em quatro anos agrícolas. Em cada ano, os experimentos foram conduzidos no delineamento em blocos completos casualizados, com quatro repeti es. As variáveis analisadas foram: estatura de plantas, rendimento de gr os, esterilidade de espiguetas, número de gr os por panícula, massa de mil gr os e rendimento de engenho. As análises de variancia, correla o e de trilha (Path Analysis) foram realizadas para cada variável, utilizando-se o programa computacional GENES. Os genótipos avaliados apresentaram diferen as significativas para todas as variáveis analisadas, nos quatro anos de experimento. A sele o de variáveis deve ser realizada em grupos de cultivares semelhantes entre si e a utiliza o de um maior número de variáveis possibilita melhores inferências sobre os componentes da produ o do arroz. A massa de gr os é o componente de produ o que mais afeta o rendimento da cultura do arroz.
Desempenho de genótipos de arroz irrigado cultivados no sistema pré-germinado com inunda??o contínua
Marchezan, Enio;Camargo, Edinalvo Rabaioli;Lopes, Sérgio Ira?u Gindri;Santos, Fernando Machado dos;Michelon, Simone;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000500005
Abstract: under the pre-germinated system of rice growing, water is retrieved about three days after seeding in order to improve plant establishment. this practice therefore, causes water and nutrient losses and weeds reinfestation. the permanence of water in the field could minimize these problems. experiments were conducted during the years of 2000/01 till 2002/03 aiming to evaluate the performance of permanent irrigated rice genotypes under flooding, specially for plant lodging, a limiting factor of this management system. the experiments were conducted on a lowland area in a haplaqualf soil and the treatments were 8, 12 and 15 genotypes in the first, second, and third years, respectively. in the year 1 the mean rice yield was 7279kg ha-1 and irga 1572-11-1f-1-4-4 (8279kg ha-1) the most productive genotype. lodging percentage varied between 0 and 60% and for most treatments in the range from to 0-20%. all genotypes presented some degree of lodging, except el paso l 144. in the year 2 the mean rice yield was 8492kg ha-1 and the most productive was brs-pelota (9282kg ha-1), and no lodging occurred among the tested genotypes. in the year 3, the mean yield was 6202kg ha-1 and was related to a high percentage of the lodging, due to climatic events during seed filling. it was observed that rice yield can be high under permanent flooding but lodging is a limiting factor depending on genotype and environmental conditions.
Qualidade da água no consórcio de peixes com arroz irrigado
Golombieski, Jaqueline Ineu;Marchezan, Enio;Monti, Mozart Borges;Storck, Lindolfo;Camargo, Edinalvo Rabaioli;Santos, Fernando Machado dos;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000600006
Abstract: the goal of the present work was to evaluate quality parameters of the water utilized in combination of the fish culture with irrigate rice. the experiment was carried in low land area, with rice pre-germinate system associated with farming of carps and silver catfish, where the levels of dissolved oxygen, temperature, ph, hardness, total alkalinity, ammonia, nitrite and water transparency were weekly monitored. the physical-chemical characteristics of the water (temperature, ph, hardness, total alkalinity, ammonia, and nitrite) do not affect the growth and development of the fish in combination with irrigate rice for cultived species (60% commom carp, 20% grass carp, 10% silver catfish, 5% silver carp and 5% bighead carp) although, the quantities of fish utilized and time of entry fingerlings affect certain water quality parameters (dissolved oxygen and water transparency) in general they maintain in levels adequate to with the standard for these species.
épocas de aplica??o do fertilizante nitrogenado no sistema convencional de semeadura de arroz irrigado
Marzari, Victor;Marchezan, Enio;Silva, Leandro Souza da;Ranno, Sidnei Kuster;Santos, Fernando Machado dos;Camargo, Edinalvo Rabaiolo;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000500032
Abstract: nitrogen (n) is the most important nutrient to establish rice crop yield, but its dynamics on oxidations and reductions soil conditions in conventional flooded rice system can improve n looses, that is related with time and quantities of n application. the objective of this experiment was to evaluate different times and quantities of n application in a conventional rice system in a "planossolo hidromórfico" (typic albaqualf) soil in santa maria, rio grande do sul state. the experimental design was in random blocs with six replications and six treatments: t1 - without n application; t2 - 45 kg ha-1 of n in beginning of tillering (bt) and 45 kg ha-1 of n at beginning of the panicle differentiation (bpd); t3 - 90 kg ha-1 of n in seeding; t4 - 45 kg ha-1 of n in seeding and 45 kg ha-1 of n in bt; t5 - 45 kg ha-1 of n in seeding and 45 kg ha-1 of n in bpd; t6 - 30 kg ha-1 of n in seeding, 30 kg ha-1 of n in bt and 30 kg ha-1 in bpd, with urea as n source. it was evaluate dry matter production, n content, and n absorbed in four evaluations (bt; 15 days after first n application; bpd; and flowering), and grain yield. parameters evaluated during rice cycle were different depending time and quantity of n application in each treatment. however, there was not difference in rice grain yield among treatments, including without n application, that appoint high soil nitrogen availability. in this condition, there is not effect of time and quantity of n fertilizer.
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