Studies with stable isotopes are becoming more common due to the increased safety of operation and quality and reliability of results. However, the use of microplots is required to decrease the costs of such studies. Since microplots are small compared to regular plot areas, the purpose of this study was to investigate whether nutritional data based on microplot samples can adequately represent the whole area, in a comparison of the nutritional status of microplot sugar cane plants at their maximum […]

Forest management practices can alter nutrient exportation from the site. The purpose of this study was to estimate nutrient contents in the aboveground biomass of eucalyptus plantations in Brazil. The influence of key climatic variables on eucalypt productivity and nutrient content was evaluated, using the database from the Reserch Programa on Soil and Eucalyptus Nutrition of the Soil Science, Departament – Federal University of Viçosa, Minas Gerais State, Brazil. Climatic characteristics were an important component of the models. In regions […]

The use of guava seedlings with adequate nutritional status determines the success of an orchard installation. This study was conducted to determine plant growth and macronutrient accumulation in herbaceous seedlings of two guava cultivars. The experiment was arranged in a completely randomized design in split-plots with three replications. Plots consisted of the two guava cultivars (Paluma and Século XXI) in nutrient solution and the sub-plots were the seven sampling dates in a 120 day period. Plant height, number of leaves, stem diameter, […]

The germination of Pisolithus spp. basidiospores originates monokaryons, characterized by having a single haploid nucleus per cell. In the field, eucalypts are associated with dykaryons of Pisolithus spp., there being no reports on the capacity of monokaryons to establish the ectomycorrhizal association with the host plant under such conditions. Although Pisolithus spp. monokaryons have been shown to form ectomycorrhizas in vitro, there is no information on the ability of these strains to promote nutrient uptake and growth of eucalypts. The […]

It was observed in an experimental soybean field in Botucatu County (SP), Brazil, that leaves presented yellowish color with purple shades in the leaflets and petioles at grain filling. These symptoms, although not described in soybean, were compatible with general descriptions of phosphorus deficiency. An experiment was conducted in pots with washed sand and nutrient solution to reproduce these symptoms in controlled conditions. Three soybean plants were grown per pot, in an uncontrolled environment. Phosphorus deficiency symptoms were first observed […]

Urban waste compost is an organic manure frequently used in horticultural areas. Thus, the objectives of this study were to evaluate the effects of urban waste compost on soil fertility, on lettuce production and on nutrient accumulation in plants. The experiment was carried out in a greenhouse using PVC columns. It was used a randomized block design with five treatments and eight replications. The treatments consisted of five urban waste compost rates (0; 30; 60; 90; and 120 t ha-1). The columns […]

Before recommending biosolids at large scale for forest plantations it is necessary to have an ample understanding of its effects on soil and plant. Thus, it was evaluated the soil fertility, nutritional status and growth of a Eucalyptus grandis plantation fertilized with biosolid (bios). The trial was established at the Experimental Station of Forest Sciences of Itatinga – ESALQ/USP (São Paulo State, Brazil). The experimental design was in complete randomized blocks, with 4 replicates. There were nine treatments, namely: (1) control; […]

The macronutrient removal by both cashew nut and apple was evaluated in orchards of two dwarf clones in a field without irrigation and fertilization on a Red-Yellow Podzolic at Pacajus Experimental Station (Centro Nacional de Pesquisa de Agroindústria Tropical (CNPAT/EMBRAPA)), in Pacajus, Ceará, Brazil, from March/94 to April/95. CCP-76 and CCP-09 cashew clones did not differ with regard to the macronutrient quantities removed by the cashew nut and cashew apple, except for Ca. This macronutrient was removed in greater quantity […]

The new planting areas of cacao in the Amazon basin of Brazil were established on eutrophic soils, especially structured Purple Earth, and on Yellow Latosol or dystrophic podzolic soils. The nutrient requirements of cacao trees cultivated on these soils were still unknown. The effects of N, P and K on the productivity of cacao were determined in two experiments conducted in the counties of Medicilândia, along the Transamazonian Highway, and Benevides, Pará, Brazil. The cacao crop of the hybrid Sca […]