This study aimed to evaluate the potential development of golden flaxseed (Linum usitatissimum L.) under the influence of the application of sources and rates of nitrogen. The experiment was conducted in the field Unioeste, Campus Cascavel, State of Paraná, using the factorial design (2×5) randomized, two nitrogen sources (urea and ammonium sulphate) and five rates of nitrogen (0, 50 , 100, 150 and 200 kg ha-1). We evaluated the following characteristics: plant height, fresh (FWP) and dry weight (DWP) of plants, number of stems, number of capsules (NC), fresh and dry weight of capsules (FWC; DWC), 100grain weight and yield (kg ha-1). The urea as nitrogen source had a positive influence on the productivity of flax, which was only influenced depending on the nitrogen source. Nitrogen rates influenced some production components, but not the crop.

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The quality of vegetal residues from crops and green manure can influence the mineralization/immobilization rate of nitrogen and the subsequent utilization of this nutrient by the following crops. The aim of this study was to evaluate the effect of nitrogen rates applied to the cover of summer corn, succeeding winter cover crops under direct drilling system. The experimental design consisted of randomized blocks with four replications in a scheme with subdivided plots. The main plot was composed of two crops previous to corn: Common oat (Avena strigosa Schieb), forage turnip (Raphanus sativus) and a fallow area (weed). The subplot consisted of four rates of nitrogen (0, 30, 60 and 120 kg ha-1). The production components analyzed were: Ear diameter, rows of grains/ear, mass of 100 grains and yield. Cover crops did not affect the components of corn production. The corn cultivated in succession to forage turnip showed responses to nitrogen fertilization.

S; T6 to 50 kg ha -1 N + 54 kg ha -1 S (both in solid form) and T7 to Micro Xisto HF (liquid form) foliar fertilizer. An F-test (Analysis of Variance) was used in order to verify statistical difference among treatments, followed by Tukey's means comparison test, at 5% significance. Grain yield presented a statistically non-significant tendency to increase. Nitrogen top dressing did not provide economic return for the climatic conditions observed in this harvest.

The aim of this study was to evaluate the productivity of four varieties of soybean grown under both cross-seeding and conventional systems. . Variety VMAX stood out in terms of productivity, regardless of the planting system. The cross-seeding system provided increment of 9.25% in grain yield.