Physic nut (Jatropha curcas L.) is a perennial oilseed species that has aroused economic interest for biodiesel production. Among other factors, it is essential to determine the nutritional demands of this species to facilitate raising it as a crop. This study aimed to evaluate the early growth and mineral nutrition of physic nut, as well as soil fertility, as affected by phosphorus fertilization. The study was carried out in a plastic greenhouse in a completely randomized block experimental design with […]

In agricultural areas irrigated with water of unsatisfactory quality, plants that are tolerant to the salinity in water and soil are needed. The purpose of this work was to evaluate the influence of the salinity of irrigation water and soil mulch on the vegetative development of amaranth (Amaranthus spp) in a greenhouse. The experiment was carried out from March to May 2006 in PVC columns with 30 kg of soil with silt loam texture. The non-use of mulch and four salinity […]

Nitrogen is indispensable for pasture establishment, maintenance and production recovery, and its effect is apparently dependent on sulphur supply. It was hypothesized that increasing nitrogen supply requires higher sulphur rates to recover signalgrass (Brachiaria decumbens Stapf.), and that fertilization increases the water use efficiency by plants. The leaf area, dry matter yield, water consumption, and water use efficiency of the grass were evaluated under the application of nitrogen and sulphur rates. Cylinders of 15 cm diameter and 20 cm depth […]

Compaction is a process that can occur in soils managed inadequately, affecting crop growth and yield directly or indirectly. The shoot development was evaluated as a function of different degrees of subsoil compaction in soybean, corn, cotton, and Brachiaria brizantha plants grown in pots filled with soil material from a dystrophic Dark-Red Latosol, with water supply through subsurface irrigation. The experiment was carried out in screened greenhouse at the School of Agronomy and Veterinary Medicine of UFMT, in rigid PVC […]

An experiment was installed under greenhouse conditions to study growth depression in mycorrhizal citrus rootstocks at six P levels (0, 50, 100, 150, 200, and 250 mg kg-1), with and without (controls) inoculation of the arbuscular mycorrhizal fungus (AMF) (Glomus intraradices). The rootstock used was Citrus reshni Hort. Ex Tanaka, cv. Cleópatra, grown in an autoclaved, limed mixture (3:1) of a soil with low available P and washed sand. There were five replicates per treatment, in a random 6 x 2 factorial design. Six […]