Plants differ in preference for mineral nitrogen forms for uptake and metabolism. In rice plants, this preference can be associated with the growth stage. This study aimed to evaluate the growth, N nutrition and yield of the rice cultivars BRS Colosso and BRSMG Conai in nutrient solution with different ratios of nitrate and ammonium. The experiment was arranged in a completely randomized design in split plots with four replications. The plots were represented by five N-nitrate (N-NO3–): N-ammonium (N-NH4+) ratios […]

Aruana grass (Panicum maximum cv. Aruana) is well adapted to pastures, especially those grazed by sheeps, but knowledge on mineral nutrition of this grass is scant. In order to evaluate the nutritional status of this forage in relation to nitrogen, Aruana grass was grown in a nutrient solution with N six rates (14; 112; 210; 294; 378 and 462 mg L-1). The experiment was carried out in a greenhouse in the Spring, from October to December 2000. Each experimental unit consisted of […]