The interest in crambe (Crambe abyssinica ) cultivation in Brazil is on the rise, whereas information on the nutrient requirements for this crop is scarce. The objective of this work was to evaluate the effect of nitrogen-phosphorus-potassium (N-P2O5-K2O formula 8:28:16) fertilization (0, 150, and 300 kg ha-1) on crambe shoot biomass production, grain and oil yields, and nutrient extraction and exportation in the second growing season after soybean. The experiment with a Haplorthox (Dystroferric Red Latosol) was carried out for […]

Silicon (Si) is beneficial to plants in several aspects, but there are doubts about the effectiveness of leaf application. The purpose of this work was to evaluate the effects of Si, applied in a newly developed stabilized silicic acid form to the leaf, on nutrition and yield of irrigated white oat and wheat. Two experiments were performed (one per crop) in winter 2008, in Botucatu-SP, Brazil. A completely randomized block design with 14 replications was used. Treatments consisted of a […]

Losses of productivity of flooded rice in the State of Rio Grande do Sul, Brazil, may occur in the Coastal Plains and in the Southern region due to the use of saline water from coastal rivers, ponds and the Laguna dos Patos lagoon, and the sensibility of the plants are variable according to its stage of development. The purpose of this research was to evaluate the production of rice grains and its components, spikelet sterility and the phenological development of […]

High wheat yields require good N fertilization management. The objective of this study was to evaluate the effects of different N applications at sowing using Entec (N source with nitrification inhibitor) and urea (traditional N source) at covering, on four wheat cultivars. The experiment was conducted in a randomized block design in a factorial scheme, with four replications, at the Experimental Station of the Faculdade de Engenharia de Ilha Solteira – UNESP, on a dystrophic, epi-eutrophic alic Red Latosol with […]

The potential grain yield of late flooded rice is important for decision making of producers. Yields of rice crops sown after the recommended period are restricted due to unfavorable climatic conditions. The objective of this research was to evaluate grain yield and agronomic, technical and economic efficiency of broadcast nitrogen for flooded rice sown in December in the state of Rio Grande do Sul, Brazil. The field experiment was carried out in 2005/2006, in Cachoeirinha. Treatments consisted of two sowing […]

Nutrition and crop yield can be affected by chemical modifications of the soil owing to lime and phosphogypsum surface application. The purpose of this study was to evaluate the effects of surface application of lime and phosphogypsum, at the establishment of a no-tillage system, on nutrition and grain yield of black oat, in a dry-winter region, in area previously used with conventional tillage. The experiment was carried out in 2003 and 2004, on a Haplorthox in Botucatu County, São Paulo […]

Nitrogen is an essential nutrient for common bean. However, there are still doubts about which source and level should be used to supply crops with this nutrient via sidedressing application in no-tillage systems. The objective of this work was to evaluate the influence of sources and doses of sidedressed nitrogen on common bean nutrition and grain yield (Phaseolus vulgaris L.) under no-tillage, on a Rhodic Nitisol. It was used a randomized complete block design with four replications, in a 2×4 […]

A field trial was carried out to evaluate the effects of nitrogen and potassium top dressing on upland rice. The treatments consisted of a 5 x 3 factorial design (five nitrogen doses – 0, 25, 50, 75, and 100 kg ha– and three potassium doses – 0, 25 and 50 kg ha-1), arranged in a complete randomized design, with three replicates. The results showed that several yield characteristics were positively influenced by nitrogen and potassium fertilization. The best combination of […]

Nitrogen top dressing period affects wheat grain yields and should occur at the stages when yield potential is established. In order to determine the critical stages related to N needs, field experiments were conducted at Estação Experimental Agronômica/UFRGS, Eldorado do Sul (RS), Brazil, in 1993, 1994 and 1995. Wheat cultivars BR 23 (1993 and 1994) and Embrapa 16 (1995) were sown by the end of June at 300 seeds m-2. Nitrogen treatments (40 kg ha-1) were applied at the following stages: (a) plant emergence, (b) […]