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Search Results: 1 - 10 of 179951 matches for " Prado Renato de Mello "
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Satura??o por bases e híbridos de milho sob sistema plantio direto
Prado, Renato de Mello;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000200024
Abstract: the knowledge of the hybrids of suitable maize to each condicion of the ground in under no-tillage is of significant importance technique. to evaluate the response of corn hybrids to base saturation levels (v%), two experiments were performed with v% equal to 45 and 65, in cerrado areas of uberaba, mg, brazil, four years under no-tillage. a completely randomized block design was used, with four replications. seven corn hybrids represent the treatments: z 8474, br3123, ag 122, c 333, d 657, exceller and p 3071. the results showed that the base saturation of 65% contributed more for the increments in yield components and for the grain yield than the 45% base saturation level. the hybrids presented different yield responses, the highest beeing for the 65% base saturation treatment: p 3071 and z 8474 and 2); for the 45% base saturation treatment: c 333. choosing the right hybrids for each base saturation level is an important criterium to maximize corn yields under no-tillage in the cerrado region of brazil.
Satura o por bases e híbridos de milho sob sistema plantio direto
Prado Renato de Mello
Scientia Agricola , 2001,
Abstract: O conhecimento dos híbridos adaptados a cada condi o de rea o do solo em sistema plantio direto é de significativa importancia técnica. Para avaliar o comportamento de híbridos de milho sob sistema plantio direto, quanto a alguns componentes de rendimento, submetidos a níveis de satura o por bases, foram conduzidos dois experimentos no V% 45 e V% 65 em área com 4 anos em sistema plantio direto, na regi o dos cerrados, em Uberaba, MG. Os experimentos foram desenvolvidos no delineamento em blocos ao acaso, com quatro repeti es. Os sete tratamentos foram constituídos pelos seguintes híbridos de milho: Z 8474, BR 3123, AG 122, C 333, D 657, Exceller e P 3071. Na média dos híbridos de milho estudados a satura o por bases de 65% foi a que mais contribuiu para os incrementos nos componentes do rendimento e nos rendimentos de gr os. Os híbridos apresentaram comportamento diferenciado no rendimento de gr os, destacando-se na satura o por bases 65%, os híbridos P 3071 e o Z 8474 e no nível 45% destacou-se o híbrido C 333. A utiliza o de híbridos específicos para cada nível de satura o por bases mostrou-se uma importante ferramenta para a maximiza o do rendimento da cultura do milho em sistema plantio direto no cerrado.
Desenvolvimento inicial e estado nutricional do maracujazeiro em resposta à aplica??o de lodo têxtil
Prado, Renato de Mello;Natale, William;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000600015
Abstract: in the treatment of liquid effluents of the textile industry the textile sludge results as residue. this work aimed at evaluating the effect of sludge application to the substrate of production of passion fruit cuttings in the development, and nutritional status of plants. experimental design used was randomized blocks with five treatments and four replications. the textile sludge was applied in the doses of 10, 15, 20 and 30 g per pot (dry base), corresponding 10, 15, 20 and 30 t ha-1, respectively, and a control without application. plants were fertilized with n, p, k, zn and b at 300, 450, 150, 5, and 0.5 mg dm-3, respectively. the experimental unit was represented by pots with 2 dm3 of a red latosol (oxisol) (v = 29%). after 100 days the textile sludge corrected soil acidity. however, in doses superior to 10 t ha-1 it caused plants death. the textile sludge increased the content of n, k, s, b, mn and zn, reduced ca and mg content, and it didn't alter cu and fe content of passion cuttings dry matter.
Efeito da escória de siderurgia e calcário na disponibilidade de fósforo de um Latossolo Vermelho-Amarelo cultivado com cana-de-a?úcar
Prado, Renato de Mello;Fernandes, Francisco Maximino;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000900014
Abstract: the aim of this work was to evaluate the effect of slag and limestone, on the available p concentration of the soil planted with sugarcane. a field experiment was conducted in ituverava, sp, brazil, in a red-yellow oxisol. calcitic limestone and the slag were added in order to increase the base saturation to 50%, 75% and 100%, in addition to the control without correction. the linear effect of the slag on the soil available p, contrasting the lack of relationship when the limestone was applied, suggests that the positive effect of the slag is mainly due to the silicate effect than to the ph effect.
Altera??es na cor e no grau de flocula??o de um Latossolo Vermelho-Escuro sob cultivo contínuo de cana-de-a?úcar
Prado, Renato de Mello;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000100024
Abstract: the study aimed at assessing the degree of modification of certain physical properties and of the colour of the superficial soil layer of a dark-red latosol of medium texture, subjected to the continuous cultivation of sugar cane during 25 years in jaboticabal, sp, brazil. the treatments consisted of two types of soil use, i.e. absence of cultivation (native vegetation) and intense cultivation with sugar cane, at three depth levels of 0-10, 10-20 and 20-30 cm. the continuous cultivation altered the colour of the level 0-10 cm from 2.5yr2.5/4 (absence of cultivation) to 2.5yr3/4, and impaired the macro structure and lessened the degree of flocculation of the soil's clay.
Calagem na nutri??o de cálcio e no desenvolvimento do sistema radicular da goiabeira
Prado, Renato de Mello;Natale, William;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004001000008
Abstract: the application of lime in acid soils improves the plant root system and, consequently, enhances water and nutrients absorption by the plants. the objective of this work was to evaluate the effects of lime application on the development of root system and calcium nutrition of guava plants cultivated in an acid distrofic red latosol (typic hapludox). soil samples were collected in four equidistant points, at 75 cm of the trunk and at 0-20 cm and 20-40 cm of depth, in the plots that had received zero (control), 3.7 and 7.4 t ha-1 of lime. soil samples were chemically analysed. lime material was applied at planting, incorporated with grating and moldboard plow. on the second and third years after guava plantation, effects of liming in chemical properties were determined. forty two months after lime incorporation in the soil (third year of guava plants cultivation), samples of roots were collected with a cylindrical auger, for dry mass and calcium content evaluation. samples of leaves were also collected. liming corrected soil acidity increased base saturation and improved calcium availability to plants and, consequently, improved guava root system. calcium concentrations of 30 mmolc dm-3 in the soil and of 7.5 g kg-1 in the roots were associated with the highest guava root growth.
Efeitos da aplica??o da escória de siderurgia ferrocromo no solo, no estado nutricional e na produ??o de matéria seca de mudas de maracujazeiro
Prado, Renato de Mello;Natale, William;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000100038
Abstract: the basic slag can consist in an alternative source of ca and mg, as well as punishment of soil acidity improving the nutricional state of passion plants, and determining the success of the implantation of an orchard. thus, it was objectified to evaluate the effect of siderurgy slag iron-chromium, in the alterations of the chemical attributes of the soil, in the nutrition of the plants and the development of passion seedlings. for this, it was installed an experiment in conditions of greenhouse, using the following increasing doses of the residue: zero; half; once; once and half and twice to raise v =80%. after 30 days of incubation of the slag in the soil, it was proceeded the plantation of the passion seedlings, in substratum of a distrofic, acid red latossol (pot with 2,8 dm3), cultivating them per 85 days. the application of the siderurgy slag iron-chromium promoted the neutralization of the acidity of the soil, however, in doses relatively low (360 kg ha-1) resulted in reduction in the nutrients and the production of dry matter of passion seedlings.
Escória de siderurgia e calcário na corre??o da acidez do solo cultivado com cana-de-a?úcar em vaso
Prado, Renato de Mello;Fernandes, Francisco Maximino;
Scientia Agricola , 2000, DOI: 10.1590/S0103-90162000000400023
Abstract: the neutralizing components of steel will residue are linked with high energy, combined with the presence of several metallic elements; these characteristics interfere in the chemical evaluation of their neutralization power. the aim of this study was to evaluate if the neutralization power of lime would be compatible with the residue used to produce steel, as a function of ph, h+al, and ca+mg contents on acid soils in the cerrado region, for sugar cane cultivation. this study was performed in 20 dm3 pots in a greenhouse, with acrustox and quartzipsamment soils, in two sucessive cultivations of sugar cane (first cutting and second cutting), harvest was 210 days after ammendments incorporation, for each cultivation. treatments constituted of two corrective agents: limestone and steel will residue, in two levels of application, as follows: level 1 = the rate to increase v to 50%, and level 2 = double of the rate necessary to increase v to 50%. at the end of each cultivation, soils were sampled and analysed chemicaly. the reactivity of the steel will residue depends on the soil class type. the efficiency of the steel will residue based on the power of neutralization adopted for limestone was not sufficient to allow evaluation of the quantity necessary of the product for the correction of soil acidity, suggesting the necessity of further studies.
Aspectos econ?micos da aduba??o fosfatada para cultura do milho
Prado, Renato de Mello;Fernandes, Francisco Maximino;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000300027
Abstract: phosphorus has an expressive participation in corn crop production costs, especially for the brazilian 'cerrado' soils. the economic aspects of this practice must be evaluated, mainly in the case of a competitive global market. therefore an assessment of certain economic aspects related to the application forms of phosphorus was made. cast and single furrow application methods were used in comparisson to the alternative double furrow practice. the br 3123 hybrid corn was used. treatments consisted of the p application modes in double furrow, single furrow and cast, at the levels of: 0; 0.50; 0.75; 1.00; 1.25; 1.50 of the recommended rates for corn (90kg of p2o5 ha-1). for the analysis average prices in force during the 1990's of one ton of corn and one ton of triple superphosphate were considered (us$86.06 and us$224.69, respectively), and the total operating cost of us$342.22 ha-1. in general the increase of the phosphorus rate boosted the yield and the net income per hectare; the cast fertilizer aplication by hand proved to be economically unfeasible. the double furrow treatment resulted, on the average, in a higher net income and a cost/benefit ratio exceeding by 17.7% that of the single furrow application mode.
Renato de Mello Prado,Renata Moreira Leal
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v36i3.2046
Abstract: Objetivando-se avaliar o efeito da omiss o de macronutrientes, de boro e de zinco no crescimento, na produ o de matéria seca, nos sintomas visuais e no estado nutricional de plantas de girassol. Conduziu-se um experimento em solu o nutritiva aerada. O delineamento experimental foi inteiramente casualizado, com nove tratamentos, que corresponderam à solu o completa (macro e micronutrientes) e à omiss o individual de N, P, K, Ca, S, Mg, B e Zn, em duas repeti es. Avaliou-se a altura das plantas, o número de folhas, o diametro do caule, a área foliar e a matéria seca, além do teor foliar de macro e micronutrientes. As omiss es individuais de N, P, K e Ca foram as mais limitantes para o crescimento vegetativo do girassol, avaliado sobre a produ o de matéria seca das plantas. Isso resultou em altera es morfológicas que se traduziram em sintomas visuais característicos da deficiência nutricional de cada elemento. PALAVRAS-CHAVE: Helianthus annuus; deficiência; desordem. This study was carried out in aerated nutritive solution to evaluate the effect of macronutrients, boron, and zinc omission on plant growth, dry matter production, visual symptoms and nutritional status of sunflower. The experiment was arranged in a completely randomized design with two replications and nine treatments corresponding to the complete solution (macro and micronutrients) and individual omission of N, P, K, Ca, S, Mg, B and Zn. We measured plant height, number of leaves, stem diameter, leaf area and dry matter, and leaf content of macro and micronutrients. The individual omissions of N, P, K, and Ca were the most limiting to plant dry matter production, and resulted in morphological alterations represented by characteristical visual symptoms of the nutritional deficiency of each element. KEY-WORDS: Helianthus annuus; deficiency; nutritional disorder; nutrients; visual symptom.
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