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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...

Adubação do milho: VIII - Ensaios com estêrco e adubos minerais

In this paper are reported the results of experiments conducted during several years at three different sites of the State of São Paulo: Campinas, on terra roxa misturada soil; Ribeirão Prêto, on terra roxa legítima soil, and Engenheiro Hermilo, on glacial soil. In the Campinas experiment, beside other treatments, manure at the rate of 12.8 metric tons per hectare was compared...

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...

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...

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 do algodoeiro: V - Ensaios com azôto, fósforo e potássio, em "campos de cooperação

This paper reports the results obtained in 71 fertilizer experiments with cotton conducted from 1935-36 up to 1941-42 in private farms located on the principal soil types of the State of São Paulo's cotton belt. In this work were compared 0, 40 and 80 kilograms of P2O5, per hectare, as well as three levels of nitrogen and of potash, and three forms of phosphates. Nitrogen and...

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 da cana-de-açúcar. XIII - Estudo conjunto de experiências com diversos fosfatos realizadas entre 1950 e 1963

Based on experiments conducted from 1950 up to 1963 on different soil types of the State of São Paulo, the authors studied the efficiency of several phosphorus carriers, for the fertilization of sugar cane, when applied in the presence of NK at the rate of 100 kilograms of total P2O5 per hectare. The areas used were all deficient in phosphorus with pH varying between 4.5 and 6.3...

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...

Adubação do algodoeiro: VIII - Ensaios com diversos adubos fosfatados (2.ª série)

Proceeding with the publication begun in a previous paper, the authors report the results of further experiments designed to test the efficiency of various phosphates for cotton. This second series was conducted between 1941-42 and 1944-45. While one of the six experiments utilized to determine the effects on the yields was annual, the others were conducted in the same plots for...

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 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...

Adubação da soja: VI - Efeitos do enxôfre e de vários micronutrientes (Zn, Cu, B, Mn, Fe e Mo), em solo Latosol Roxo com vegetação de cerrado

The responses of soybeans to sulfur, zinc, copper, boron, manganese, iron and molybdenum were tested in an area of latosol soil previously covered with "cerrado" vegetation. Sulfur increased considerably the seed yield, but no significant effects of the indicated micro-nutrients were observed.