Bragantia

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List of Papers (Total 294)

Fermentação do mosto de uva: influência do sistema de vinificação sôbre a acidez volátil do vinho

Three different fermentation techniques were compared to determine their influence on the volatile acidity of the wine. They were as follows; a) natural fermentation: b) with the selected wine yeast strain I.A.-78, and c) with a mixture of yeasts. The results of these experiments, with six replications, pointed out that the fermentation with the wine yeast strain I.A.-78 gave...

Adubação da batatinha experiências com adubos minerais e farelo de cacau

This paper reports the results obtained in five experiments conducted from 1946 to 1950 and designed to study the effect of the addition of cocoa-shell meal to mineral fertilizers supplying 40-120-60 and 80-120-60 kilograms of N-P205-K2O per hectare. The mentioned meal, which is a by-product of the cocoa industry and consists essentially of the shells of the cocoa beans, was...

Novo amostrador para as terras roxas

In this paper is described a new soil sampler, specially designed for use in sampling Brazilian purple-soil series, which is known to present very peculiar physical properties. The sampler was developed as a result of the need to sample the soil frequently, for the purpose of maintaining the soil water balance in irrigation experiments, carried on field plots. This basic method...

A eliminação da substância péctica do café despolpado é causada por microrganismos

In papers recently published, Pereira Jr. (9, 10) claimed that coffee fruits have enzimes capable of breaking down the insoluble pectic substance which involves their seeds. This conclusion was drawn from an experiment where freshly pulped coffee fruits were placed in a calcium hydroxide solution containing 0.4% of NaCl as an enzime activator. After this treatment the seeds which...

Efeito do preparo do solo na produção de milho

Two methods of preparing the soil for the corn crop were tested in three consecutive years at the Pindorama Agric. Exp. Sta., São Paulo. The two methods consisted of plowing the land, followed by harrowing compared with the superficial preparation of the soil with the hand hoe, so as to destroy the weeds without breaking up the upper soil layers. The statistical analysis of the...

Adubação do algodoeiro: IX - Ensaios com diversos adubos fosfatados (3.ª série)

In this third paper on phosphorus fertilizers for cotton the authors report the results obtained in eight experiments carried out from 1949-50 to 1954-55, in which superphosphate was compared with Hyperphosphate and Serrote-phosphate (ground rock phosphates) on the basis of 0, 40 and 80 kilograms of P2O5 to the hectare in the presence of nitrogen and potash. The experiments were...

Influência do preparo do solo sôbre a estrutura da terra-roxa-legítima

Soil samples taken from experimenial plots that had been submitted to different tillage practices tor 13 years were used for studies os their structure. The results obtained showed that for the terra-roxa-legilima, a soil highly structured, intensive tillage practices reduced the diameter (geometric mean) of soil aggregates. For the two-plowing treatment the diameter of the...

Composição química do feijoeiro e absorção de elementos nutritivos, do florescimento à maturação

The purpose of this investigation was to gain information on the rate of dry matter production and nutrient absorption of bean plants. Samples of fertilized and unfertilized bean plants, grown on «terra-roxa-misturada» type of soil at Campinas and under field conditions, were taken at various stages of growth. They were divided in roots, stems, leaves and fruits and have been...

Ensaios sôbre época de desbaste na cultura do algodoeiro

In this paper the authors study four groups of experiments, comprising a total of 32 annual results, in which the time of thinning cotton varied from 15 up to 80 days after the emergence of the plants. The experiments were conducted between 1927-28 and 1943-44 and located at several places of the State of São Paulo. On the average, as thinning was delayed the stands became a...

Adubação do milho: XVIII - Ensaios com diversos fosfatos (4.ª série.)

In this fourth paper on phosphorus fertilizers for corn the authors report the results obtained in four experiments located on different sites of the State of São Paulo, in which superphosphate was compared with three ground rock phosphates, the comparison being based on their contents of total P2O5. While one experiment was annual, the others were conducted for two, two and five...

Experiências de adubação do arroz com diversos fertilizantes fosfatados e potássicos

This paper reports the results obtained with upland rice in two long-term experiments located at Campinas, on "terra-roxa-misturada" soil, in which various sources of phosphorus and potassium fertilizers were compared. In both trials rice occupied the plots after 4 crops of corn, 2 of cotton, and 4 of small grains, each receiving the fertilizers indicated below. For upland rice...

Contrôle do tripes causador do prateamento das fôlhas do amendoim, por meio de inseticidas

Three experiments were conducted in three consecutive years at the Ribeirão Prêto Agricultural Experiment Station for studying the control of the tobacco thrips on peanut. The insecticides tested were Aldrim, DDT, Diazinon, Disiston, Endrim, EPN, Gusation, Rhodiatox, and Thimet. The results from the experiments indicated that all the insecticides tried were equally effective for...

Anatomia e desenvolvimento ontogenético da flor de mandioca

Flower development of the manioc (Manihot utilissima Pohl) is acropetal. The early phases of cellular differentiation of the floral appendages are similar. All organs develop by anticlinal divisions of the surface layer, accompanied by periclinal divisions in the second tunica layer, and also in the outermost layer of the corpus, followed by the formation of an apical meristem...

Influência da posição das sementes no fruto do cacaueiro sôbre a germinação e desenvolvimento das mudas

Seed samples from the top, center, and bottom of the cocoa fruit (Theobroma leiocarpa Bern.) were planted separately for comparison. No difference in germination of the seeds or growth of the seedlings for the three types of samples was noticed.

Absorção de nutrientes pela batatinha

Nutritional studies were carried out with potted potato plants, aiming at determining the absorption rate and uptake of essential nutrients in relation to age of the crop. The experimental plants were grown in pots containing 10 kg of soil. Cultural practices, water, and fertility conditions (including addition of minor elements) were uniform for all pots. Samples composed of an...

Mineralogia dos solos da série taquaral na estação experimental "Teodureto de Camargo

The minerals present in soils of the Taquaral Series are originated from diabase and glacial sedimentary rocks. The glacial contribution in materials to these soils reaches great depths. There is little variation in the percentage of these minerals in horizons A, B, and C, but they decrease in the lower layers, CDr horizon, where diabase is the most important contributor. The...

O Endosperma de café como material para estudos citológicos

The endosperm tissue of the coffee seed was used successfully for chromosome countings, acetic orcein technique having proved satisfactorily to stain the well spread metaphasic and prophasic chromosomes. Endosperms with 62, 64, 66 and 68 chromosomes occur in the monosomic plants of C. arabica (n = 43) while only endosperms with 3n = 66 are formed in the typica variety (2n = 44...

Melhoramento do cafeeiro: XXIII - Novos dados sôbre a variabilidade em linhas isogênicas de café

Sixteen strains of different cultivars of Coffea arabica were evaluated for yielding capacity, vigor and plant height. The data collected after six cumulative harvests have indicated that the high yielding progenies (J 24ex 'Bourbon Amarelo' and C 959 'Bourbon Vermelho') had also better vigor and were taller than the other progenies. Attention was turned to yield and plant height...

Relação chuva-perdas por erosão em diferentes tipos de solo

Data on rainfall, soil erosion and water losses from runoff plots were recorded for a 10-year period in four experiment stations, Campinas, Ribeirão Prêto, Pindorama, and Mococa. Correlation studies were made between the soil and water losses, and total rainfall; also, the data were examined in relation to the 5, 15, 30, and 60-minute rain intensity in millimeters per hour...

Reconhecimento fotogeológico de parte do grupo açungui

With the present paper the authors had in mind to work out a photogeological survey in the southern part of the State of São Paulo in order to obtain a basic map for future detailed work. For this purpose aerial photographs and mosaics of the Insttiuto Agronômico were used, ata 1:25.000 scale. The criteria utilized in the photo-interpretation were the following: 1) the...

Análise de folíolos e pecíolos na diagnose da nutrição da batatinha

This article deals with the preliminary phases of a study aimed at adapting the technique of foliar analysis for diagnosing the mineral nutrition of potatoes. In a pot experiment, analytical results for petioles and leaflets were obtained at three sampling dates and yields of tubers were measured. There were three series of fertilizer treatments with graded amounts of N, P, or K...

Aubação do feijoeiro em solos derivados do arenito Bauru

Seven fertilizer experiments were laid out in 1960-61 on soils of the «arenito Bauru» type, to study the effects of several treatments on the yields of dry beans. For determining the residual effect of the treatments, three of the experiments were repeated in 1961-62. In the average of the experiments of 1960-61, the responses to 60 and 120 kg/ha (kilograms per hectare) of P2O5...

Adubação da cana-de-açúcar. XI - Experiências com diversos fosfatos (1961 a 1963)

Five experiments were conducted in the State of São Paulo to study the efficiency of different sources of phosphorus for the production of sugar cane on three types of soil, using 50, 100 and 150 kilograms of total P2O5 per hectare in the presence of NK. The soil pH varied from 4.8 to 5.6. Phosphorus significantly increased the yields in all of the experiments. As an average of...

Adubação da cana-de-açúcar. X - Experiências com diversos fosfatos (1959-60)

Three experiments were conducted in 1959-60 in the State of São Paulo to study the efficiency of different sources of phosphorus for the production of sugar cane, using 50, 100 and 150 kilograms of total P2O5, per hectare in the presence of NK. Phosphorus significantly increased the yields in all of the experiments, in one of them, on «terra-roxa-misturada» type of soil, the...

Correlação entre a resposta do algodoeiro à adubação fosfatada e a análise química do solo, nas condições do Estado de São Paulo

In this paper the correlation between cotton responses to phosphorus application and chemical analysis of soils is discussed, based on 126 experiments conducted in the State of São Paulo. The results indicate the possibilities of estimating the effects due to phosphorous fertilization on the basis of the amount of soluble phosphorus and soil acidity, by means of a multiple...