This study aims to evaluate the efficacy of nitrogen (N) forms: ammonium, nitrate, and urea on maize performance, N uptake and use efficiency, and the grain protein content. The experiment was laid out as a split-plot with the whole plot factor being the three fertilizer treatments and the subplot being four N levels (0, 25, 50, and 100 kg N ha⁻¹) with three replicates. Plant tissues were analyzed for total N uptake. Grain and stover yields and grain protein were determined at maturity. The highest (62 cm) plant height (at the vegetative stage) was recorded in nitrate treatment. Grain yield was highest (2.9 t ha⁻¹) in plots that received nitrate. Fertilization with nitrate enhanced grain protein more (11.6%) than when urea or ammonium was used. N uptake was highest (42 kg N ha⁻¹) under ammonium treatment, intermediate (22 kg N ha⁻¹) in those treated with nitrate, and lowest (21 kg N ha⁻¹) in urea-receiving plots. Application of 25 kg N ha⁻¹ resulted in the least N uptake efficiency with optimal values registered at 50 kg N ha⁻¹. Agronomic N use efficiency differed among the rates with values ranging from 44 to 183 t ha⁻¹ per N kg ha⁻¹ applied in the order of 25 < 50 < 100 kg N ha⁻¹. This study showed that for optimal growth, productivity, and nutritional benefits, maize ought to be grown using nitrate N form at the rate of 50 kg N ha⁻¹.

这项研究旨在评估铵，硝酸盐和尿素氮（N）形式对玉米性能，氮素吸收和利用效率以及谷物蛋白质含量的功效。将实验布置为拆分图，整个图因子为三种肥料处理，子图为四个氮水平（0、25、50和100 kg N ha ^-1），重复三次。分析植物组织的总氮吸收量。在成熟时测定谷物和秸秆的产量以及谷物蛋白质。硝酸盐处理记录了最高的（62厘米）植物高度（在营养阶段）。在接受硝酸盐的土地上，谷物产量最高（2.9 t ha ^-1）。与使用尿素或铵盐相比，硝酸盐施肥可提高谷物蛋白含量（11.6％）。氮吸收最高（42 kg N ha^-1）在铵盐处理下，在接受硝酸盐处理的土壤中为中间（22 kg N ha ^-1），在接受尿素的地块中最低（21 kg N ha ^-1）。25 kg N ha ^-1的施用导致最低的N吸收效率，最佳值为50 kg N ha ^-1。农艺氮的利用效率在不同的比率之间有所不同，每施用N kg ha ^-1的值在44至183 t ha ^-1范围内，顺序为25 <50 <100 kg N ha ^-1。这项研究表明，为了获得最佳的生长，生产力和营养价值，应该以50 kg N ha ^-1的硝态氮形式种植玉米。