This study evaluated the initial growth and tolerance to water stress after planting Samanea saman seedlings produced with different substrates and inoculation patterns. The experiment used a factorial design (3 × 3), with three substrates: standard (67% subsoil + 33% cattle manure), a commercial substrate (composed mainly of peat), and treated sewage sludge; and three inoculation patterns: control (no inoculation), fertilized (no inoculation + chemical fertilization), and inoculation with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi. The seedlings were planted in plastic pots inside a greenhouse. They received irrigation after planting and were submitted to water deficit for 35 days, followed by rehydration for 31 days. The inoculation promoted higher height and biomass for seedlings produced in the standard substrate. In the sludge, the roots biomass decreased when fertilized or inoculated. Seedlings grown in sludge showed higher height and biomass before planting and at the end of the experiment. Although, after rehydration, the height increment was similar for the sludge and the standard substrate. Seedlings grown with the commercial substrate are not recommended for planting sites subjected to water deficit. The standard substrate with inoculation and the sludge without inoculation or fertilization produced seedlings that showed better recovery and growth after water deficit.

中文翻译：

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萨曼娜萨曼（Samanea saman）的接种，生长和对水分胁迫的耐受性与其他基质的污水污泥相比

这项研究评估了种植Samanea saman后的初始生长和对水分胁迫的耐受性用不同的底物和接种方式产生的幼苗。实验采用因子分解设计（3×3），具有三种基质：标准基质（67％的底土+ 33％的牛粪），商业基质（主要由泥炭组成）和处理过的污泥。三种接种方式：对照（不接种），受精（不接种+化学施肥）以及固氮菌和丛枝菌根真菌的接种。将幼苗种植在温室内的塑料盆中。他们在种植后接受灌溉，缺水35天，然后补水31天。接种促进了在标准基质中产生的幼苗的更高的高度和生物量。在污泥中，施肥或接种后根的生物量减少。在污泥中生长的幼苗在种植前和实验结束时显示出较高的高度和生物量。尽管在再水化后，污泥和标准基质的高度增量相似。不建议将使用商业基质种植的幼苗用于缺水的种植地点。带有接种物的标准基质和未接种或未施肥的污泥所产生的幼苗在缺水后表现出更好的恢复和生长。