Production of Yellow Cortez (Tabebuia serratifolia) Seedlings in Response to Nitrogen Fertilization

ABSTRACT This work aimed to evaluate the effect of sources of nitrogen and respective levels on growth and quality of Yellow Cortez (Tabebuia serratifolia) seedlings. Seedlings were grown on a Oxisol and nitrogen sources were ammonium nitrate, ammonium sulphate and calcium nitrate, applied in five doses (0, 75, 150, 225 and 300 mg dm–3) and increments of 25, 50, 75 and 100 days after transplanting. The experimental design was randomized in blocks in factorial scheme (3 × 5) with four replications. At 125 days after transplanting, the addition of nitrogen provided significant effect on seedling production of Yellow Cortez (Tabebuia serratifolia), and the ammonium sulfate produced the best means for all traits and indexes evaluated. We recommend the use of ammonium sulfate at a dose of 100 mg dm–3 N for Yellow Cortez seedling.

摘要：本研究旨在探究氮源及其施用量对黄科尔特兹木（Tabebuia serratifolia）实生苗生长与品质的影响。试验以氧化土为栽培基质，供试氮源包括硝酸铵、硫酸铵与硝酸钙，设置5个施用量梯度（0、75、150、225和300 mg dm⁻³），并于移栽后25、50、75和100天分次施用。试验采用3×5因子设计的随机区组方案，共设置4次重复。于移栽后125天开展指标测定，结果显示，氮肥施用对黄科尔特兹木实生苗的培育效果具有显著影响，其中硫酸铵在所有被测性状与指标上均表现出最优的平均表现。本研究推荐采用硫酸铵作为氮源，施用量为100 mg dm⁻³氮，用于黄科尔特兹木实生苗生产。