Silicon is classified as a beneficial nutrient and can improve the nutritional dynamics of plants, although it is not considered an essential nutrient for plants. In an experiment in a randomized block design, three coffee cultivars (Catuaí, Mundo Novo and Icatu) were planted in plastic tubes, combined with six doses of calcium silicate (T0=0, T1=0.063, T2=0.125, T3=0.25, T4=0.5 and T5=1.0 g dm-3 substrate), to compare the nutritional efficiency of the cultivars in response to silicon fertilization. Cultivar Icatu showed the […]

Based on field observations it is often impossible to detect differences in soil B contents after the application of B fertilizers, even when increased leaf B contents are detected. This has raised doubts as to the efficacy of the B extractor used in routine soil B determinations. An experiment was conducted to study B extraction and availability to soybean in an Oxisol in the state of Mato Grosso. Boron (as boric acid) doses ranging from 0.0 to 10.0 kg ha-1 […]

Knowledge about the nutritional demand of a crop is essential for fertilizer recommendation. In this study nutrient concentration and accumulation in leaves and fruits of Jatropha curcas L. were measured and nutrient extraction by fruits harvested between the 1st and 4th year of cultivation were estimated. The study was carried out at the Paraiso Farm, iin Viçosa, Minas Gerais State. Four leaf and fruit samples, each one containing 15 leaves or 20 fruits were randomly collected from an area with […]

Irrigated plantations of dwarf coconut for the production of coconut water have expanded considerably in Brazil. Higher yields obtained under irrigation affect the amount of N and K required by dwarf coconut, influencing the relationships between yield and soil and leaf contents of these nutrients. An experiment was set up on an Ultissol in the Brazilian Northeast coastal tablelands, following a Pan Puebla III experimental matrix in a randomized block design. Ten combinations of urea and potassium chloride were weekly […]

Manure has been used as organic nutrient sources in different soil, climate, crop, and soil management systems. The effects of the continuous use of these systems is best evaluated by integrated analysis, based on different soil and crop attributes. This study was carried out to compare nutrient sources, mainly the organic ones, based on some chemical and physical soil attributes as well as crop attributes. The study was carried out at an experimental station of Epagri in Campos Novos, on […]

Unless fertilizer is properly placed in the soil it can be harmful. This experiment was conducted to study cotton (Gossypium hirsutum) root growth and initial plant development and nutrition as affected by fertilizer placement. Cotton plants were grown in pots with a glass wall. The fertilizer was applied 5.0 cm under the seed row and 0, 2.5, 5.0 and 10.0 cm beside the seed row. Root growth was evaluated every 3 days, and 21 days after emergence the plants were […]

The effects of soil fertility levels, root pruning and localized fertilization on root and shoot growth in ‘Catuaí’ coffee plants were studied in a greenhouse experiment. Sub-superficial (30-70 cm) samples of a Red-Yellow Latosol (Oxisol) were packed in PVC columns consisting of three 15 cm high rings of 20 cm diameter. Four treatments with three fertility levels [low (FB), medium (FM) and high (FA), and medium without root pruning with only two rings (FM2)] were installed before planting by adding […]

The effect of N applications (time and rates) on chlorophyll and N contents in bean leaves was evaluated and correlations among them and with the yield established. Carried out in the Selvíria region, State of Minas Gerais, Brazil, the experiment was set up in a completely randomized block design in a factorial 3 x 5 scheme. Treatments consisted in the combination of N (urea) application by side dressing at five levels (0, 35, 70, 105, and 140 kg ha-1 of N) at three times […]

The effect of N, Ni, Mo, Co and S omission on the N and S leaf contents of common bean plants (Phaseolus vulgaris), grown in a greenhouse, was evaluated. The experimental design was factorial, using two soil types (Entisol and Cambisol), two inoculation levels (with and without Rhizobium), combined with six fertilization treatments: (a) Complete (N, P, K, Ni, Mo, Co and S); (b) without N; (c) without Ni; (d) without Co; (e) without Mo; (f) without S. The experimental […]

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 […]