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Search Results: 1 - 10 of 66931 matches for " Ant?nio Carlos Pimentel;Alvarez "
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Restaura??o do solo para a cultura de cana-de-a?úcar: III - Período 1958-61 e considera??es gerais
Wutke, Antnio Carlos Pimentel;Alvarez, Raphael;
Bragantia , 1968, DOI: 10.1590/S0006-87051968000100018
Abstract: this paper reports the data obtained in the third period of an experiment which was started in 1954, to study the recovering for sugar cane culture of an original low fertility and impoverished soil (humic red-yellow latosol) . at the same time with the results of the two harvestings of this third planting one discusses the soil productivity and fertility variations which had occurred up to the first planting. in a randomized blocks design eight treatments with four replications were compared. they are as follows: a) control; b) p + lime + leguminous cover crop; c) pk + cover crop; d) pk + lime + cover crop; e) npk; f) npk ++ lime; g) npk + cover crop; h) npk + lime + cover crop. in this period the cover crop still used was the sun hemp (crotalaria junceal.) and the sugar cane variety planted was cb 41/76. in the planting time the fertilization applied was at the rates of 90-80-120 kg per hectare of n, p2o5 and k2o respectively and as ammonium sulfate, plain superphosphate and potassium chloride. after the first harvesting other applications of nitrogen and potassium were made, at the rates of 60 kg and 90 kg per hectare respectively, using the same sources of fertilizers in top-dressing application. the yields of sugar cane obtained in this period showed appreciable effects due to lime and potassium and a considerable increase in soil productivity as compared with the data corresponding to the other ones. this result is attributed to the soil fertility increase, on account of favorable variations in soil acidity and ca, mg and po4 levels, as shown by chemical analyses. in spite of the leguminous cover crop usage and chemical fertilizations, no increase in carbon, nitrogen and potassium soil levels were detected.
Aduba??o da cana-de-acúcar: XIV. Aduba??o NPK em latossolo roxo
Alvarez, Raphael;Wutke, Antnio Carlos Pimentel;Arruda, Hermano Vaz de;Van Raij, Bernardo;Gomes, Antnio Carlos;Zink, Frederico;
Bragantia , 1991, DOI: 10.1590/S0006-87051991000200014
Abstract: nineteen 33 npk factorial experiments with sugar cane were carried out in 1958/59 on dusky red latosol soils of various sugar plant owned lands, in the state of s?o paulo, brazil. the amounts of nutrients applied corresponded to: 0, 90 and 180 kg/ha of n; 0, 80 and 160kg/ha of p205; and 0, 100 and 200kg/ha of k2o. the experiments were separated in two types of areas, based on former soil use: one group in areas where sugar cane was cultivated over ten years, and the other group in areas where which sugar cane had never been cultivated. the results were in accordance with former management, indicating residual effect of phosphorus applications and potassium depletion on the areas former cultivated with sugar cane. however, responses to nitrogen could not be related to former soil usage. responses of sugar cane to nitrogen were related to soil organic matter (r = 0.695**) and to phosphorus with resin extractable p (r = 0.709**), but the response to potassium fertilizer was not related to soil k (r = 0.284 n.s). with adjusted response functions, the optimal economical amount of nutrients were shown to be in general, higher than the current recommendations. yield increases promoted by npk were directly related to the maximum economic yield (r = 0.773**).
Aduba??o da cana-de-a?úcar: XV - experimentos com micronutrientes nas regi?es canavieiras do estado de S?o Paulo
Alvarez, Raphael;Wutke, Antnio Carlos Pimentel;Arruda, Hermano Vaz de;Godoy Júnior, Gentil;
Bragantia , 1979, DOI: 10.1590/S0006-87051979000100003
Abstract: the results obtained with twenty three experiments on the application of micronutrients to sugar cane are presented in this paper. the experiments were installed to evaluate the possible occurrence of micronutrient deficiencies in soils of s?o paulo state that had been more intensively cultivated with this crop. therefore, in the localization of the field plots care was taken securing a large variation of conditions, especially those of the soil that are related to availability of micronutrients. the experiments were planted in randomized block designs with four replications. the treatments were as follows: 1. 000 (general control); 2. npk (control); 3. npk + fe; 4. npk + b; 5. npk + cu; 6. npk + zn; 7. npk + mn; 8. npk + mo. the nitrogen, phosphorus and potassium were applied as ammonium sulfate, superphosphate and potassium chloride, at the rates of 80kg/n, l00kg/p2o5 and 120kg/k2o per hectare. the micronutrients were applied in the furrows in addition to the basic fertilization: iron, manganese, copper and zinc, as sulfates; boron, as borax, and molybdenum as ammonium molybdate. in accordance with the purpose of the study the soils of the experiments showed great variation in the characteristics that are involved with the micronutrients availability, as the ph and the original fertility level. in spite of this, in only one of the experiments the micronutrients, cooper and molybdenum in the case, gave yield increases; even so, the responses were not clearly related to the soil characteristics. the results indicate that problems concerning micronutrient deficiencies are not to be expected in the normal conditions of the sugar cane culture in s?o paulo state, thus, the possible occurrences of such anomalies, until now, must be related to fortuitous events.
Restaura??o de solo para a cultura da cana-de-a?úcar: II - Período 1956-58
Wutke, Antnio Carlos Pimentel;Alvarez, Raphael;Gargantini, Hermano;Arruda, Hermano Vaz de;
Bragantia , 1960, DOI: 10.1590/S0006-87051960000100043
Abstract: the experiment reported in this paper was started in 1954. its object was to study the effect of various treatments on the restoration of productivity in a tract of impoverished land (glacial formation), located at the usina ester, cosmópolis county. eight treatments with four replications are being compared in randomized blocks. they are as follows: (a) control, (b) p + lime + leguminous cover crop; (c) pk + cover crop; (d) pk + lime + cover crop; (e) npk; (f) npk + lime; (g) npk + cover crop, (h) npk + lime + cover crop. ammonium sulfate, plain superphosphate, and pottassiu chloride were applied at the rates of 90, 120, and 90 kg per hectare of n, p2o5, and k2o, respectively. the cover crop used was the sun hemp (crotalaria juncea l.). the sugar cane variety planted was the c. b. 40/69. the results obtained in the first harvest of this second planting were as follows: (a) all plots receiving fertilizers gave higher yields than the control; (b) the highest yields were given by the plots receiving pk + lime + cover crop, npk + lime + cover crop, and npk + lime. the results obtained so far indicate that the best treatments improved the soil productivity, whereas there is some evidence of a decrease in productivity induced by others.
Fixa??o do nitrogênio do ar pelas bactérias que vivem associadas às raízes do feij?o de porco e do feij?o baiano
Gargantini, Hermano;Wutke, Antnio Carlos Pimentel;
Bragantia , 1960, DOI: 10.1590/S0006-87051960000100040
Abstract: the determination of the nitrogen fixed from the air by bacteria in association with sword bean (canavalia ensiformis d. c.) and cowpea (feij?o baiano) (vigna sinensis (l.) savi) was the main purpose of this work. the two leguminous plants were sown in mitscherlich pots filled with 6 kg of "terra-roxa-misturada" soil, collected at the depth of 20 cm in the central experiment station, instituto agron?mico, campinas county. the following treatments with three replications were compared: 1) check; 2) npk; 3) npk + limestone; 4) npk + inoculant; 5) npk + limestone + inoculant; 6) pk + limestone; 7) pk + limestone + inoculant. the amount of limestone was calculated to raise the ph to 6.5 and the base saturation of the sail to 70%. the fertilizer applications for n, p2o5,. and k2o were 2.0 g, 2.2 g and 3.0 g respectively, as solutions of nh4no3, k2hp04 and kcl. harvesting was done at the beginning of blooming-time by cutting the plants even with the ground. later, both the aerial parts, as well as the roots, were weighed fresh and after drying at 60° c. nitrogen determination by the kjeldahl method of these two fractions, aerial parts and roots, were mode after drying. the soil from those pots without nitrogen fertilizer were submitted to the same analysis for comparison with the initial level of this element in the soil. the data obtained indicate that the two leguminous plants showed a good nitrogen fixation capacity and that the feij?o baiano was more effective. the amounts of nitrogen fixed in pots that received the best treatments corresponded to 48.5 kg per hectare for the sword bean and 73.0 kg for the "feij?o baiano". from this point of view both leguminous plants were satisfactory to be employed as green manure.
Avalia??o das possibilidades de escórias de siderurgia como corretivos da acidez do solo
Wutke, Antnio Carlos Pimentel;Gargantini, Hermano;Gomes, A. Gentil;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100045
Abstract: this paper presents preliminary results obtained in a greenhouse test in which blast furnace slags and other lime materials were compared as soil correctives. comparisons were made between dolomitic limestone, calcitic limestone, oyster-shell lime, slag from iron production and slag from steel production by the martin-siemens basic procedure. these materials were compared at two different rates. general application of npk fertilizers was made and the control treatment received no lime. the soybean variety abura (glycine max (l.) merril) was utilized as an indicator plant; four plants were grown in each pot. final grain production was measured and soil samples were collected, from the pots, in order to check the ph and exchangeable acidity (h+ + al+3). the results obtained showed that under the conditions of the test, the dolomitic limestone, the calcitic limestone and the oyster-shell lime were all equally efficient in their corrective effect. the slag from steel production showed an intermediary effect, while the slag from iron prodution appeared to be the least efficient. the grain yield from these treatments did not presente any statistically significant difference. the actual grinding of the materials used in the experiment seemed satisfactory. a finer grinding is not deemed necessary unless it is required by the legislation covering the commerce of soil correctives.
Aduba??o da soja: II - Aduba??o mineral em "terra-roxa-misturada com argilito do glacial"
Miyasaka, Shiro;Wutke, Antnio Carlos Pimentel;Venturini, Wanderley Rinaldo;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100034
Abstract: the southern region of s?o paulo state, with an area of 500.000 hectares, and comprising the municipalities of itapetininga, itararé, itaberá, itapeva and s?o miguel arcanjo, is of low fertility but has aroused the interest of farmers because of the excellent topography and the proper climate for the cultivation of wheat (triticum aestivum, l.) and soybeans (glycine max (l) merril). in order to study the reaction of the soybean to the application of chemical fertilizers containing nitrogen, phosphorus, potassium, calcium, sulphur and minor elements, an experiment was made in engenheiro bacelar distrit, municipality of itapeva, on red soil ("terra-roxa") mixed with glacial clay. the experiment wos designed to permit the study of the residual effects of the fertilizers too. the results obtained in this experiment indicated a strong favorable response to phosphorus and calcium and a limited reaction to potassium. they also showed a negative response to nitrogen ond o non-significant effect from use of sulphur and minor elements. a theoretical study was made concerning the economics of fertilizing with phosphorus, being verified that under the conditions of the present experiment the application of ordinary superphosphate directly to soybean brought returns. the considerable residual effect observed in the second year of the experiment indicated that this profit can be sufficient to increase the yield of subsequent plantings. on the other hand, the residual effect demonstrated in this experiment supports the view that the application of mineral fertilizers, especially of phosphorus, should be made to the annual crops that precede the soybean in a rotation program.
Níveis de fertilidade do solo para a cultura algodoeira: II - Correla??o entre a produ??o e o teor de fósforo no solo
Verdade, Francisco da Costa;Venturini, Wanderley R.;Amaral, álvaro Zingra do;Wutke, Antnio Carlos Pimentel;
Bragantia , 1966, DOI: 10.1590/S0006-87051966000100004
Abstract: from a total of 216 trials with cotton fertilization carried out from 1957 through 1960, the results were put in correlation with the phosphorus contents of the soil. on account of the small number of favorable reactions to the nitrogenous and potassic fertilization, just that one only nutrient could be studied. is was found out, however, that low levels of nitrogen and potassium (30 kilograms to the hectare) give a better consistence to the action of phosphorus. considering 100 the best yield, it was possible to statistically establish the ratio between the contents of phosphorus of the soil and the percentages of yield. the correlation was highly significant, giving an explanation for the linear being about 50% and the quadratic one less than 10% for the soils of arenito bauru. thus, the equation was obtained leading to the higher percentage of yield by adding the phosphated fertilizer.
Enterorrafias em plano aposicional convencionale com adesivo à base de cianoacrilato no cólon descendente de eqüinos
Duarte Claudia Acosta,Cattelan José Wanderley,Alessi Antnio Carlos,Valente Paula Pimentel
Ciência Rural , 2002,
Abstract: Em eqüinos, as enterotomias no cólon descendente s o necessárias para remover enterólitos, corpos estranhos e material alimentar compactado que n o podem ser removidos por técnicas conservativas. Este segmento intestinal possui um suprimento sangüíneo pobre, além de predisposi o a complica es pós-operatórias relacionadas à contamina o bacteriana. Assim, este estudo foi conduzido com o objetivo de efetuar avalia es clínicas e anatomopatológicas do emprego de adesivo tecidual à base de cianoacrilato no cólon descendente de eqüinos, comparando-o a uma técnica de sutura aposicional convencional. A interven o cirúrgica foi realizada em 15 animais posicionados em decúbito lateral direito, através de laparotomia pelo flanco esquerdo, sob anestesia geral inalatória. Após a exterioriza o do cólon descendente, foram realizadas duas enterotomias de cinco centímetros de extens o cada, distanciadas 20cm uma da outra. Os animais foram aleatoriamente distribuídos em cinco tempos de observa o de três animais cada e sacrificados aos três, sete, 14, 35 e 70 dias de pós-operatório. O adesivo butil-2-cianoacrilato e o fio de poliglactina 910 mostraram-se igualmente apropriados para uso em enterorrafias desse órg o, sendo que o fio de poliglactina 910 provocou inflama o inicial mais intensa que o cianoacrilato e, mais tardiamente, ambos causaram inflama o granulomatosa do tipo corpo estranho observada, primeiramente, junto ao fio de poliglactina 910 (7o dia) e, a partir do 35o dia, ao redor do cianoacrilato.
Disponibilidade de fosfatos naturais em fun??o do ph do solo
Wutke, Antnio Carlos Pimentel;Schimidt, Nélson C.;Amaral, álvaro Zingra do;Verdade, Francisco da Costa;Igue, Kozen;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100017
Abstract: a field experiment (pindomonhangaba exp. sta.) and greenhouse test (instituto agron?mico) were carried out to study the phosphorus availability of three brazilian rock phosphates under different conditions of soil acidity. the soil on which the field experiment was conducted was classified as "série monotipica pinda". samples from the same soil were used for the greenhouse test. araxá phosphote. olinda phosphote. alvorada phosphate (apatita do morro do serrote), and ordinary superphosphate were utilized as phosphate sources. corn hybrid (hmd - 6999) was used as an indicator plant. twelve treatments were compared in the field experiment in a randomized block design with three replications. they were os follows: (1) nk; (2) nk + 1/2 lime; (3) nk + lime; (4) nk + superphosphate; (5) nk + superphosphate + 1/2 lime; (6) nk + superphosphate + lime; (7) nk + olinda; (8) nk + olinda + 1/2 lime; (9) nk + olinda + lime; (10) nk + araxá; (11) nk + araxá + 1/2 lime; (12) nk + araxá + lime. the results from the field experiment were measured as grain yields. in the pot experiment, the same twelve treatments as mentioned above plus n0p0k0 and nk + alvorada in presence of three doses of lime (0, 1/2 and 1) were included. the ph of soil from the pots of all treatmens was checked before sowing. the results were meosured as dry matter weight of aerial parts of the plants, harvested five days after the male inflorescence started to blossom. determinations of cao, mgo, and p2o5, were made. the results from the field experiment indicated that the soil ph had no influence on the phosphorus availability of the rock phosphates tested. this fact might have been due to liberation of soil organic phosphorus, which may have masked the soil acidity effect. in the pot experiment, however, the results indicated that the effect of the soil ph varied according to the type of rock phosphate. the alvorada phosphate was less available when the soil ph was increased by liming, and this effect was refle
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