The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The […]

The objective of this study was to evaluate gas exchange in the massai grass during establishment and regrowth cycles in a greenhouse, using five nitrogen (N) fertilization levels. A completely randomized split-plot design of five nitrogen levels (0; 150; 300; 450 and 600 mg N•dm-3 of soil) was employed with the N levels as plots, and the cycles (establishment, regrowth 1 and 2) as subplots, evaluated with five replicates. We evaluated leaf transpiration (E), leaf temperature (TFOL), leaf photosynthesis rate […]

A greenhouse experiment was carried out to evaluate the effect of P:Mg ratios on soil fertility and on mineral composition and yield of alfalfa cultivated in a dystrophic Red Yellow Latosol (Oxisol). It was used a split-plot in a complete randomized design, with three replicates. Treatments were combinations of P (rates: 0, 100, 200, and 400 mg kg-1, source: triple superphosphate) and Mg (rates: 0, 100, and 200 mg kg-1, source: magnesium chlorite) at the following P:Mg ratios: 0, 0.5, […]