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Search Results: 1 - 10 of 13264 matches for " Rogério Peres Soratto "
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Produtividade de gr?os e exporta??o de nutrientes de cultivares de arroz irrigadas por aspers?o em conseqüência da época de semeadura
Crusciol, Carlos Alexandre Costa;Soratto, Rogério Peres;Arf, Orivaldo;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000200008
Abstract: the use of appropriate cultivars and sowing date can provide higher grain yield of upland rice, in sprinkler-irrigated system. however, data about nutrient exportation by sprinkler-irrigated rice grains are scarce. the objective of this work was to evaluate the effect of sowing dates on the grain yield and nutrients exportation by grains of upland rice cultivars (iac 201, iac 202, carajás, cna 7800 e cna 7801) under sprinkler irrigation. experiments were carried out in 1995/96 and 1996/97 growing seasons, on a typic haplustox, in selvíria, state of mato grosso do sul, brazil. the sowings were carried out at the beginning of the second middle of september, october, november, december, january, and february, in each growing season. a randomized complete block design, in a split plot scheme, with four replications was used. sowing dates affected grain yield and nutrient exportation on it. november sowing reached highest nutrient exportation, because provided highest grain yield. in early sowing (september), the cultivar carajás presented highest grain yield and nutrient exportation; however, during october to december sowings the cultivar cna 7801 presented the best results. it is possible sowing in february using the cultivars iac 201 and carajás with grain yield higher than 3900 kg ha-1 under sprinkler irrigation system.
Produ??o de fitomassa e acúmulo de nutrientes pela aveia-preta em fun??o da aplica??o de calcário e gesso em superfície na implanta??o do sistema plantio direto
Soratto, Rogério Peres;Crusciol, Carlos Alexandre Costa;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000400004
Abstract: in order to evaluate the influence of lime and phosphogypsum surface application, during establishment of no-tillage system, on black oat dry matter yield and nutrient cycling, an experiment was carried out during 2003 and 2004, on a haplorthox. a randomized complete block design, in split-plot arrangement, and four replications was used. the plots consisted of four dolomitic limestone levels (0; 1,100; 2,700; and 4,300kg ha-1). the subplots were represented by presence or absence of phosphogypsum application (2,100kg ha-1). the treatments were applied in october 2002. surface application of lime did not affect black oat dry matter yield in no-tillage system, in both presence and absence of phosphogypsum application. phosphogypsum increased ca and s-so42- contents in soil and s uptake by black oat crop. in year with less water availability, the surface application of phosphogypsum promoted increasing on dry matter yield, n and ca contents, and n, ca, fe, and zn accumulation by black oat crop.
Nutri??o e produtividade do amendoim em sucess?o ao cultivo de plantas de cobertura no sistema plantio direto
Crusciol, Carlos Alexandre Costa;Soratto, Rogério Peres;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007001100006
Abstract: the objective of this work was to evaluate cover crops shoot dry matter production and nutrients accumulation and the effect of straw mulch mechanical management on the dry season peanut crop nutrition and yield, in no-tillage system. the experiment was carried out on a dystroferric hapludox, in botucatu, sp, brazil. a randomized blocks design, in a splitplot array, with four replications, was used. the plots were composed by cover crops: palisadegrass - brachiaria brizantha cv. marandu; pearl millet - pennisetum glaucum cv. bn 2; and guineagrass - panicum maximum cv. momba?a. the subplots were composed by absence or presence of straw mulch mechanical management, by horizontal crusher use, 20 days after chemical management. pearl millet presented the largest shoot dry matter production and the lowest nutrient contents, 71 days after emergence, in comparison with palisadegrass and guineagrass. the cover crops presented similar nutrients accumulation in shoot. the cover crops species and straw mulch mechanical management does not affect the peanut leaves nutrient contents and yield in no-tillage system.
Extra??o e exporta??o de nutrientes em cultivares de batata: I - macronutrientes
Fernandes, Adalton Mazetti;Soratto, Rogério Peres;Silva, Beatrice Luciana;
Revista Brasileira de Ciência do Solo , 2011, DOI: 10.1590/S0100-06832011000600020
Abstract: the determination of nutrient absorption during the growth cycle is essential to determine the periods in which these elements are most required and the correct amounts that should be provided for potato, but for most cultivars used in brazil the information is extremely scarce. the objective of this study was to evaluate absorption and exportation of the macronutrients n, p, k, ca, mg, and s by the potato cultivars ágata, asterix, atlantic, markies, and mondial. the experiment was conducted in itaí, s?o paulo state, brazil, in the 2008 winter growing season on an oxisol. plots consisted of the five potato cultivars and subplots of sampling times (at planting and every seven days after emergence). the cultivars mondial and asterix, the most productive, absorbed highest average macronutrient quantities per hectare (116 kg n, 18 kg p, 243 kg k, 50 kg ca, and 13 kg mg), while ágata, atlantic and markies absorbed smaller average amounts (92, 14, 178, 35, and 9 kg ha-1, respectively). the stage of highest macronutrient demand by the cultivars was during initial tuber bulking (42 to 70 days after planting). macronutrient exportation was not directly related to tuber yield, since it was not the most productive cultivar (mondial) that exported the highest macronutrient amounts. asterix exported higher n, p, k and mg amounts (88, 15, 220 and 8 kg ha-1, respectively), while the lowest quantities were exported by cultivar atlantic (48 kg ha-1 n, 10 kg ha-1 p, 143 kg ha-1 k, and 5 kg ha-1 mg). the wide variation in absorption among cultivars, especially of k and n, indicate the need of a differentiated fertilization management.
Cátions hidrossolúveis na parte aérea de culturas anuais mediante aplica??o de calcário e gesso em superfície
Soratto, Rogério Peres;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000100009
Abstract: surface liming efficiency can be increased through water-soluble organic compounds released by plant residues. however, it is unknown if the contents of these compounds in crop residues can be modified by lime and phosphogypsum surface applications. the objective of this study was to evaluate effects of lime and phosphogypsum surface applications on the content of water-soluble cations in crop residues of rice, common bean and black oat. the experiment was carried out on a haplorthox located in botucatu county, s?o paulo state, brazil. a randomized complete block design, in a split-plot scheme and four replications was used. the plots consisted of four dolomitic limestone levels (0; 1,100; 2,700; and 4,300 kg ha-1). the subplots were represented by the presence or absence of phosphogypsum application (2,100 kg ha-1). for the summer crops a split-split-plot scheme was used. the subsubplots were constituted by two upland rice cultivars (caiapó and iac 202), in the growing season of 2002/03, and two common bean cultivars (carioca and pérola), in the 2003/2004 growing season. in the winter season of 2003 and 2004, black oat was grown on the entire area, using only one cultivar. the water-soluble cation content in rice shoots, common bean and black oat crops were affected by lime and phosphogypsum surface applications. surface application of phosphogypsum increased ca and decreased mg water-soluble contents in crop shoots, mainly in the first years of cultivation. surface liming increased the water-soluble cation contents in all crop shoots. the highest water-soluble cation contents in shoot residues were measured in common bean and black oat during flowering.
Métodos de determina??o de cálcio e magnésio trocáveis e estimativa do calcário residual em um Latossolo submetido à aplica??o de calcário e gesso em superfície
Soratto, Rogério Peres;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000200021
Abstract: the determination of the non-reacted lime fraction in the soil ("residual lime") after initial surface application of lime without incorporation in no-tillage systems can be important to determine when lime reapplication is necessary. the objective of this study was to evaluate: the exchangeable ca and mg contents, extracted by percolation with a kcl solution or ion exchange resin; the quantity of applied lime that had not reacted in the soil, determined based on the non-exchangeable ca and mg contents; and the effect of the phosphogypsum on the exchangeable ca and mg contents and the surface lime dissolution, 18 months after application. the experiment was carried out on a haplorthox (oxisol) in botucatu county, s?o paulo state, brazil. it was adopted a randomized complete block design in a split-plot scheme, with four replications. the plots were composed by four dolomitic limestone levels (0; 1,100; 2,700; and 4,300 kg ha-1) with neutralization power = 84.3 % and reactivity = 84.5 %. the subplots consisted of two phosphogypsum levels (0 and 2,100 kg ha-1). both lime and phosphogypsum were surface-applied, without incorporation. there was a high correlation between exchangeable ca and mg determined through percolation of a kcl solution and that by ion exchange resin methods. the ion exchange resin method overestimated exchangeable ca and mg contents in soil with recent lime surface application. surface application of phosphogypsum reduced lime dissolution in the surface layer (0-0.10 m). the non-exchangeable ca and mg contents may be used to estimate the amount of soil residual lime.
Atributos químicos do solo decorrentes da aplica??o em superfície de calcário e gesso em sistema plantio direto recém-implantado
Soratto, Rogério Peres;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000200022
Abstract: there is interest to establish the no-tillage system in areas cultivated previously with conventional tillage or pasture, with surface liming after system establishment. this practice is possible provided that there are no physical obstacles for root growth. phosphogypsum is an alternative to decrease al3+ and increase base saturation (bs), mainly ca2+, in the subsoil, and can be used complementary to liming. the objective of this study was to evaluate the changes in chemical soil attributes (ph cacl2, h + al, al3+, ca2+, mg2+, s-so42-, bs, and content of cationic micronutrients) as affected by lime and phosphogypsum surface application in a recently established no-tillage system in dry-winter region. the experiment was carried out on a dystroferric haplorthox, in botucatu county, s?o paulo state, brazil. a randomized complete block design, in split-plot scheme and four replications, was used. the plots consisted of four dolomitic limestone rates (0; 1,100; 2,700; and 4,300 kg ha-1), intended to reach a bs to 50, 70 and 90 %, respectively. the subplots were represented by the absence or presence of phosphogypsum application (2,100 kg ha-1). soil samples were collected 3, 6, 12, and 18 months after lime and phosphogypsum application, at depths of 0-0.05, 0.05-0.10, 0.10-0.20, 0.20-0.40, 0.40-0.60, and 0-0.20 m. lime surface application reduced soil and increased exchangeable ca and mg contents, mainly in the top soil layers. phosphogypsum application promoted increasing exchangeable ca and s-so42- contents, and decreased exchangeable al in the soil, favoring the effects of surface liming that influenced the subsoil layers more rapidly. base saturation values obtained at a depth of 0-0.20 m with liming were lower than those estimated by bs method, mainly at the highest levels, even with phosphogypsum application. surface liming did not influence micronutrient contents in the 0-0.20 m layer.
Nutri??o e produtividade de gr?os da aveia-preta em fun??o da aplica??o de calcário e gesso em superfície na implanta??o do sistema plantio direto
Soratto, Rogério Peres;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000200026
Abstract: nutrition and crop yield can be affected by chemical modifications of the soil owing to lime and phosphogypsum surface application. the purpose of this study was to evaluate the effects of surface application of lime and phosphogypsum, at the establishment of a no-tillage system, on nutrition and grain yield of black oat, in a dry-winter region, in area previously used with conventional tillage. the experiment was carried out in 2003 and 2004, on a haplorthox in botucatu county, s?o paulo state, brazil. a randomized complete block design was used in a split-plot scheme with four replications. the plots (18.0 x 5.4 m) were composed by four dolomitic limestone levels (0; 1,100; 2,700; and 4,300 kg ha-1), with neutralization power = 84.3 % and reactivity = 84.5 %, and the subplots (9.0 x 5.4 m) were composed by without and with phosphogypsum application (2,100 kg ha-1). the increase in soil ca as a result of lime and phosphogypsum application, reduced the mg content in the black oat flag leaf in a year with water deficiency. surface liming increased k and reduced cu and fe concentration in the black oat flag leaf. surface application of phosphogypsum increased the s content in the black oat flag leaf. surface liming increased the black oat grain yield in the year with water deficiency, with higher effects being observed when phosphogypsum was applied.
Nitrogen fertilization on common bean after out-of-season maize intercropped with Urochloa brizantha and Urochloa ruziziensis Aduba o nitrogenada no feijoeiro após milho safrinha consorciado com Urochloa brizantha e Urochloa ruziziensis
Emerson de Freitas Cordova de Souza,Rogério Peres Soratto
Semina : Ciências Agrárias , 2012,
Abstract: Common bean plant demanding higher amounts of nitrogen (N), but are scarce information about common bean N demanding when grown after maize intercropped with palisade grass. The purpose of this study was to evaluate the effect of N fertilization in common bean grown under no-tillage system, in succession to out-of-season maize intercropped with Urochloa brizantha (Syn. Brachiaria bryzantha) or Urochloa ruziziensis (Syn. Brachiaria ruziziensis). The experiment was conducted during two agricultural years, on a dystroferric Haplorthox. A randomized blocks design, in a split plot scheme, with four replicates, was used. The plots were composed by two types of straws previous common bean crop (maize + U. brizantha and maize + U. ruziziensis) and subplots were composed by four N rates (0, 35, 70 and 140 kg ha-1), using ammonium nitrate as source. Nitrogen application improved N nutrition and increased the growth of common bean plants grown after out-of-season maize intercropped with U. brizantha or U. ruziziensis, but little influenced grain yield. Grain yield of common bean grown after out-of-season maize intercropped with U. brizantha or U. ruziziensis was similar. O feijoeiro comum é uma planta bastante exigente em nitrogênio (N), porém, s o escassas as informa es sobre a necessidade da cultura por esse nutriente quando cultivada em sucess o ao milho consorciado com braquiárias. Objetivou-se avaliar o efeito da aduba o nitrogenada no feijoeiro cultivado no sistema plantio direto, em sucess o ao milho safrinha consorciado com Urochloa brizantha (Syn. Brachiaria bryzantha) ou Urochloa ruziziensis (Syn. Brachiaria ruziziensis). O experimento foi realizado durante dois anos agrícolas, em Latossolo Vermelho distroférrico. O delineamento experimental foi o de blocos ao acaso, com parcelas subdivididas, com quatro repeti es. As parcelas foram constituídas por dois tipos de palhadas precedentes ao cultivo do feijoeiro (milho + U. brizantha e milho + U. ruziziensis) e as subparcelas por quatro doses de N (0, 35, 70 e 140 kg ha-1), utilizando como fonte o nitrato de am nio. A aplica o de N melhorou a nutri o nitrogenada e aumenta o crescimento do feijoeiro cultivado em sucess o ao milho safrinha consorciado com U. brizantha ou U. ruziziensis, porém, pouco influenciou a produtividade de gr os. A produtividade de gr os do feijoeiro foi semelhante em sucess o ao milho consorciado com U. brizantha e U. ruziziensis.
Desempenho da mamoneira IAC 2028 em fun??o do espa?amento entre fileiras e popula??o de plantas na safrinha
Souza-Schlick, Genivaldo David de;Soratto, Rogério Peres;Pasquali, Coralie Bussamra;Fernandes, Adalton Mazetti;
Bragantia , 2011, DOI: 10.1590/S0006-87052011000300006
Abstract: with the release of new low height castor bean cultivars with indehiscent fruit and suitable for mechanized cultivation, it is necessary to establish adequate row spacing and plant population for these materials. thus, the objective of this study was to evaluate row spacing and plant population influence on the performance of castor bean cultivar iac 2028 in out-of-season cropping. the experiment was carried out in 2008 and 2009, on a haplorthox in botucatu county, state of s?o paulo, brazil. a randomized complete block design was used in a split-plot scheme with four replications. the plots were composed by four row spacings (0.45, 0.60, 0.75 and 0.90 m) and subplots comprised four initial plant populations (25,000, 40,000, 55,000, and 70,000 plants ha-1). the largest row spacing provided the lower plant growth, number of racemes per plant, number of fruits per raceme, grain and oil yields. the highest plant populations provided smaller aboveground dry matter, stem diameter, yield components, and higher height of the first raceme insertion. grain yield was little affected by plant populations, mainly in small row spacings. the smallest row spacings provided higher grain yields of castor bean cultivar iac 2028 in out-of-season cropping, being recommended 0.45 and 0.60 m row spacings.
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