Tithonia diversifolia (Tithonia) is performed as an invasive species with a high adaptive potential that can be used for several purposes, including an alternative source of forage for different animal categories. The use of Tithonia is growing rapidly as farmers recognize its high accumulation of biomass, good nutritional value and adaptation to tropical environments. However, the effects of irrigation and nitrogen on the characteristics of Tithonia have been poorly studied. In this context, the objective of this study was to identify changes in the productive characteristics and morphophysiology of Tithonia under different irrigation simulations and nitrogen fertilization rates, seeking to understand its adaptive potential in different water and nutritional scenarios, improvements in the efficiency of the use of water and nitrogen and its potential for use in a global context. Field trials was a split-plot design with three replicates. Whole plots were irrigation rate (0%, 25%, 50%, 75% and 100% of crop evapotranspiration - ETc) and the subplots were the nitrogen fertilizer rate (0, 50, 100 and 150 kg ha⁻¹). There were significant effects of irrigation, nitrogen, and their interaction on dry biomass accumulation, nitrogen- and water-use efficiency, plant height, chlorophyll index, and photosynthetic rate. Irrigation and nitrogen rates increased the dry biomass accumulation. The highest dry biomass accumulation was 7.32 Mg ha⁻¹ in cycle I and 10.4 Mg ha⁻¹ in cycle II. The greatest nitrogen-use efficiency was observed at a rate of 100 kg of nitrogen ha^−1, and the greatest water-use efficiency was observed at irrigation 75% ETc. Irrigation and nitrogen also increased plant height, chlorophyll index, and photosynthetic rate. Tithonia proved to be a plant adapted to the humid temperate climate and sandy-loam texture soil, presenting great dry biomass accumulation potential even without irrigation and nitrogen fertilization. However, the greatest dry biomass accumulation was obtained with water replacement of 100% of ETc, the crop evapotranspiration, and nitrogen fertilization of 150 kg ha⁻¹.

满天花（Tithonia）是具有高度适应性的入侵物种，可以用于多种目的，包括为不同动物类别提供替代性饲料。随着农民认识到其高生物量积累，良好的营养价值和对热带环境的适应性，二氧化钛的使用正在迅速增长。但是，对灌溉和氮素对二氧化钛特性的影响的研究很少。在这种情况下，本研究的目的是确定在不同的灌溉模拟和氮肥施肥量下，二氧化钛的生产特性和形态生理的变化，以了解其在不同水和营养条件下的适应潜力，改善水和氮的利用效率及其在全球范围内的利用潜力。现场试验是一个具有三个重复样本的分块设计。整个样地为灌溉速率（作物蒸散量（ETc）的0％，25％，50％，75％和100％），子样地为氮肥利用率（0、50、100和150 kg ha^-1）。灌溉，氮及其相互作用对干生物量积累，氮和水利用效率，株高，叶绿素指数和光合速率有显着影响。灌溉和施氮量增加了干燥生物量的积累。在循环I中最高的干生物量积累为7.32  Mg  ha ^-1，在循环II中为10.4  Mg  ha ^-1。以100 kg氮 ha ^-1的速率观察到最大的氮利用效率^，在灌溉量为ETc的75％时观察到最大的用水效率。灌溉和施氮还增加了株高，叶绿素指数和光合速率。事实证明，二恶英是一种适应潮湿温带气候和沙壤质土壤的植物，即使不进行灌溉和施氮也具有很大的干燥生物量积累潜力。但是，通过100％的ETc的水分置换，作物的蒸散和150 kg ha ^-1的氮肥施用，获得了最大的干生物量积累。