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Levantamento da fertilidade de solos da estação experimental de Pindamonhangaba

The present paper deals with fertility tests carried out with soil samples from the Pindamonhangaba Agric. Exp. Sta., one of the branch stations of the Instituto Agronômico. The samples were collected from four soil series: Pinda, Pinhão, Guatemala, and Prateada. The test plants (romaine lettuce) were grown in aluminum pots containing 1.5 kg of soil. The following fertilizer were...

Determinação do período de tempo para amonificação e nitrificação de diversos fertilizantes nitrogenados

several nitrogenous fertilizers     H. Gargantini; R. A.Catani(*) Engenheiros-agrônomo, Seção de Fertilidade do Solo, Instituto Agronômico     RESUMO Neste trabalho são apresentados os

Efeitos da calagem sobre os teores de cálcio mais magnésio de perfis de solos de cerrado

This work presents the results of three experiments carried out in "cerrado" soil in order to check out the effects of liming on the contents of calcium plus magnesium of those soils. After the experimental period (5 years) soil samples were taken from depths of 0-10, 10-20, 20-40, 40-70 and 70-100 cm and the amounts of exchangeable calcium plus magnesium were determined. It was...

Amostragem de solo para estudos de fertilidade

The following methods of collecting soil samples for fertility studies were compared : 1) thirty individual samples covering the whole area ; 2) ten composite samples, each consisting of five individual samples, covering the whole area ; 3) five composite samples, each consisting of 20 individual samples, covering the whole area. The three types of samples were collected in each...

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...

Capacidade fixadora de nitrogênio de Rhizobiumautóctone associado com soja perene e siratro, em dois solos do Estado de São Paulo

Experiments were carried out in Leonard's jars, with perennial soybean and siratro, to evaluate the nitrogen fixation ability of these legumes when in symbiosis with the population of Rhizobium sp. indigenous to two great groups of soils of São Paulo State, Brazil. The results showed that the rhizobia occuring in a "Latosolic B Terra-Roxa" and in a "Red Yellow Latosol sandy phase...