Phosphate solubilizing microorganisms play an important role in supplying phosphorous to plants. This ability has stimulated research on plant inoculation. In our study, microorganisms were isolated from Pinus and Eucalyptus plantations and selected in culture medium. They were then employed in a series of 28 experiments under greenhouse conditions in substrate, forest or sterilized nursery soil, with or without phosphate fertilization, in one of the following P forms: calcium phosphate, Araxá, or Catalão phosphate. Three isolates promoted a higher dry […]

The effects of inoculation with arbuscular mycorrhizal fungi (AMF), of soil sterilization, and of phosphorus fertilization on growth of yellow passion fruit were evaluated in greenhouse conditions. The experimental outlay was a completely randomized 2 × 3 × 4 factorial design with three replicates per treatment. The applied treatments, using 1.6 dm3 pots, were: two soil treatments (sterilized-SS and unsterilized soil-US), three P treatments (soil with 4, 11 and 30 mg dm-3 of P) and four AMF treatments (inoculation with […]

The use of phosphate-solubilizing bacteria can be a low-cost alternative to agroforestry systems in the Amazônia, where prices, transport, and producers’ low buying capacity make the use of soluble fertilizers difficult. On soils without a cultivation past, phosphates are combined mainly to Al, while on previously limed and cultivated soils, these phosphates are combined with Ca, limiting their use by plants. There is little information on phosphate-solubilizing bacteria (BSF) in the Amazon; thus, further studies are needed. The first step […]

A field experiment was conducted in the state of Paraná, Brazil, to evaluate the effect of liming on soil acidity, soil nutrient availability and yields of maize and soybeans on a Red Latosol (Oxysol), which had been cultivated for three, six and nine years under no-tillage (NT). Lime was broadcasted to the soil surface in four rates- 0, 33.3, 66.7 and 100% of the amount calculated to increase the soil base saturation (V%) to 70%; an additional treatment consisted of […]

An experiment was carried out under greenhouse conditions to evaluate the effects of arbuscular mycorrhizal fungi (AMF) and, or rhizobium inoculation, with the addition of industrial waste from lactic acid production (Ferkal), on the growth of Mimosa caesalpiniaefolia. Plastic pots of 6 L of capacity were used, filled with degraded soil from clay extraction areas with four levels of the Ferkal residue (0, 50, 100 and 200 g dm-3). Six microbiological treatments were conducted: indigenous AMF; AMF Glomus clarum; rhizobium; indigenous AMF + Rhizobium; […]

Planting spacings and sowing dates may influence nutrient absorption. Therefore, a field experiment was carried out from 1991 to 1992, at the experimental station of Embrapa/Soil Research National Center, located in Senador Canedo, Goiás, Brazil, to determine the N, P and K uptake levels in the aerial part of sunhemp (Crotalaria juncea), Crotalaria ochroleuca, black velvet bean (Mucuna aterrima) and pigeonpea cv. Kaki (Cajanus cajan), under three sowing times (beginning, middle and end of the growing season) and two spacings […]

Shoot growth, phosphorus uptake (PC) and utilization efficiency (PUE) of Eucalyptus grandis seedlings associated to Glomus etunicatum (Ge) and, or, Pisolithus tinctorius (Pt), in different P rates and soil water potentials (ψ), were evaluated in a greenhouse experiment with two geminated pots, using a split-root technique. One of the pots in the geminated set contained the treatments, arranged in a factorial scheme of two P rates (P60 and P120, corresponding to additions of 60 and 120 mg dm-3 soil), three […]

The amount and distribution of carbon, nitrogen, and sulfur in whole soil and in particle-size fractions were analyzed in two clayey Dark Red Latosols (LE1 and LE2). LE1 (forest as natural vegetation), from Cordeirópolis, São Paulo, cultivated with citrus since 1982 receiving two lime treatments, control and 18 t ha-1 applied twice in 1983 and 1994. Since 1976, LE2 (cerrado as natural vegetation) from Planaltina, Federal District (cerrado region), was cultivated with different crops (wheat, soybean, rice and sorghum) sown […]

Samples of 30 soils were taken with the objective of characterizing the Capacity Factor of Phosphorus (CFP) and its relation with several properties of soils of Entre Ríos, Argentina. Isotherms of adsorption and a quick test of P adsorption were estimated. Langmuir and Freundlich equations described the adsorption phenomenon satisfactorily. The maximum adsorption capacity varied between 46 and 716 mg kg-1 of P in the soil, considering that the soils analyzed have from medium to low CFP. The adsorption capacity […]

To get more efficient wheat varieties in phosphorus uptake and/or utilization it is important to look for the causes of the greater efficiency of particular varieties. One experiment in nutrient solution with four concentrations of phosphorus (1.6, 4.8, 12.9 and 32.3 µmol L-1) was conducted to compare efficient (Toropi and IAC 5) and inefficient cultivars (IAS 20 and CNT 8) in phosphorus uptake in relation to the amount of phosphorus taken up, phosphorus translocation and utilization, dry matter production and […]