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Search Results: 1 - 10 of 132 matches for " Crusciol "
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Produtividade de milho, espa?amento e modalidade de consorcia??o com Brachiaria brizantha em sistema plantio direto
Borghi, Emerson;Crusciol, Carlos Alexandre Costa;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000200004
Abstract: the objective of this research was to evaluate the effects on corn yield of different modes of corn intercropping with brachiaria brizantha cv. marandu. the experiment was carried out in field conditions, in 2002/2003 and 2003/2004, at fazenda experimental lageado (unesp), in botucatu, sp, brazil. the experimental design was the randomized complete block, as a factorial 2x4, with four replications. the treatments were two row spacings of corn (0.45 and 0.90 m) and four intercropping modalities: single corn; corn intercropped with b. brizantha in the row of sowing; corn intercropped with b. brizantha in space between two rows; and corn intercropped simultaneously with b. brizantha in the row and in the inter-row. the consortium modalities and the spacing used did not damage nitrogen absorption, neither for the corn nor the forage. corn grains productivity in 0.45 m row spacing was lower with the row and inter-row brachiaria consortium. depending on agricultural year, grain yield is greater in the reduced row spacing, when intercropping with brachiaria, independently of the modality.
Cover crops and herbicide timing management on soybean yield under no-tillage system
Nascente, Adriano Stephan;Crusciol, Carlos Alexandre Costa;
Pesquisa Agropecuária Brasileira , 2012, DOI: 10.1590/S0100-204X2012000200006
Abstract: the objective of this work was to evaluate the effect of cover crops and timing of pre-emergence herbicide applications on soybean yield under no-tillage system. the experiment consisted of four cover crops (panicum maximum, urochloa ruziziensis, u. brizantha, and pearl millet) and fallow, in addition to four herbicide timings (30, 20, 10, and 0 days before soybean sowing), under no-tillage system (nts), and of two control treatments under conventional tillage system (cts). the experimental design was a completely randomized block, in a split-plot arrangement, with three replicates. soybean under fallow, p. maximum, u. ruziziensis, u. brizantha, and pearl millet in the nts and soybean under u. brizantha in the cts did not differ significantly regarding yield. soybean under fallow in the cts significantly reduced yield when compared to the other treatments. the amount of straw on soil surface did not significantly affect soybean yield. chemical management of p. maximum and u. brizantha near the soybean sowing date causes significant damage in soybean yield. however, herbicide timing in fallow, u. ruziziensis, and pearl millet does not affect soybean yield.
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.
Reguladores vegetais no desenvolvimento e produtividade da cana-de-a?úcar
Leite, Glauber Henrique Pereira;Crusciol, Carlos Alexandre Costa;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000800007
Abstract: the objective of this work was to evaluate the development and productivity of sugarcane, due to plant regulators application at the cropping season beginning. the treatments consisted of three plant growth inhibitors - sulfometuron methyl, glyphosate, and compounds of organic carboxilic radicals + glyphosate - and natural ripening as control, in a randomized block design with five replicates. the ripeners hold up the growth process of plant height, without affecting the number and diameter of stems at harvest, however they influence, in different intensities and ways, the flowering and pith process. glyphosate provide the largest index of bud sprouting and damage of regrowth of the ratoon cane. the ripeners induce increase in sugar reducer total contents, contributing for the improvement in technological quality of sugarcane.
Composi??o físico-química e potencial para ensilagem do sorgo-de-guiné gigante em seis épocas de semeadura
Mateus, Gustavo Pavan;Crusciol, Carlos Alexandre Costa;Costa, Ciniro;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000900014
Abstract: the lack of alternative crops for fall-winter cultivation is a drawback in the utilization of agricultural production systems, especialy in regions with dry winters. the purpose of this study was to evaluate the potential of giant guinea sorghum (sorghum bicolor subsp. bicolor guinea race) for forage production, ensiling and plant chemical composition, in different sowing dates. the experimental design was a randomized block, with four replications, and six sowing dates. although sowing was late, giant guinea sorghum showed anticipation in development stages due to sensibility to photoperiod; its dry matter production was low, nevertheless the species presented a better quality of forage mass. due to the considerable capacity of dry matter production and ensiling potential, this species is a good option.
Palhada do sorgo de guiné gigante no estabelecimento de plantas daninhas em área de plantio direto
Mateus, Gustavo Pavan;Crusciol, Carlos Alexandre Costa;Negrisoli, Eduardo;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000600004
Abstract: crop residues on the surface of the soil can interfere in the infestation of weed of summer crops. the objective of this work was to evaluate the effect of the amount of gigantic guinea sorghum straw on the population of weed established in a no-tillage area. the experimental design used was the randomized blocks, with four replications. the treatments consisted of zero, 6,100, 7,100, 19,500, 26,700, 28,100 and 30,200 kg ha-1of guinea sorghum straw. soybean (cv. monsoy-6101) was seeded over the treatments in a density of 25 seeds m-1 and 0.45 m between lines. thirty days after the sowing of the culture, weedevaluation was accomplished. it consisted of four samplings per plot, through metallic frames of 1 m2. significant reduction of the number of weeds was verified with the increment of the straw. the control of weeds is superior to ninety percent, from 15,000 kg ha-1 on.
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.
Intervalo hídrico ótimo e compacta??o do solo com cultivo consorciado de milho e braquiária
Calonego, Juliano Carlos;Borghi, Emerson;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2011, DOI: 10.1590/S0100-06832011000600033
Abstract: intercropping of a forage and main grain crop ensures forage production in the autumn-winter, and straw for mulching in the no-tillage system. the contribution of dry root matter in the soil profile allows the improvement of soil structural quality. the objective of this research was to evaluate changes in soil physical and physico-hydric properties with the cultivation of maize grown alone and intercropped with brachiaria brizantha. the study was carried out on the experimental farm lageado (unesp, botucatu-sp) in the growing seasons 2002/2003 and 2003/2004. undisturbed soil was sampled from the layers 0-20 and 20-40 cm by volumetric rings in plots growing maize and left fallow between harvest and in plots intercropped with maize and b. brizantha in the row, where the grass was maintained for grazing after maize harvest. the least limiting water range (llwr) of these samples was evaluated, based on curves of penetration resistance and water retention in soil samples with different bulk densities. maize grown alone is sufficient to improve the physical and structural characteristics of the soil in the 0-20 cm layer. brachiaria intercropped with maize for two years improves the soil physical and structural properties in the layer 20-40 cm as well, reducing penetration resistance and increasing bulk density.
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.
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