Organic matter application was one of the suitable ways to improve soil nitrogen availability in saline soils. In this study, two soils of different levels of total soluble salts, 2.45 g kg⁻¹ (LS) and 4.03 g kg⁻¹ (HS), were used in a pot experiment with eight treatments: bio-organic fertilizer (prepared with cow dung) and farmyard manure (fowl manure) each at three dosages (3350, 6700, and 13,400 kg ha⁻¹), chemical fertilizer control (DAP: 1675 kg ha⁻¹), no fertilizer blank. At the same time, an indoor nitrogen mineralization incubation experiment with the same treatments without alfalfa planting was carried out. We aimed to explore the effects of the types and application amounts of organic fertilizers on soil nitrogen mineralization in saline soils and to improve its quality and finally realize its sustainable utilization. The main conclusions are as follows: the biomass of alfalfa treated with medium dose of organic fertilizer was higher than that of alfalfa treated with low or high dose of organic fertilizer. Compared with farmyard manure, bio-organic manure was more effective in increasing the biomass of alfalfa. The nitrogen uptake of alfalfa in high-dose treatment was significantly higher than that in low-dose treatment. The effects of the fertilizer treatments on soil nitrogen availability were in the increasing order of: medium dose, high or low dose of fertilizer treatment, single chemical fertilizer, and fertilizer free treatments by principal component analysis. For possible potential application, medium dosage of bio-organic fertilizer was recommended to apply in the region with saline fluvo-aquic soil.

有机物的施用是提高盐渍土壤中氮素有效性的合适方法之一。在这项研究中，将两种不同总可溶性盐含量分别为2.45 g kg ^-1（LS）和4.03 g kg ^-1（HS）的土壤用于盆栽试验中，进行了八种处理：生物有机肥料（用牛制备）粪便和农家肥（禽粪），分别以三种剂量（3350、6700和13,400 kg ha ^-1），化学肥料控制（DAP：1675 kg ha ^-1）），无肥料空白。同时，进行了不进行苜蓿种植的室内氮矿化温育实验。我们旨在探讨有机肥料的种类和施用量对盐渍土土壤氮矿化的影响，提高其质量并最终实现其可持续利用。主要结论如下：中剂量有机肥处理的苜蓿的生物量高于低剂量或高剂量有机肥处理的苜蓿的生物量。与农家肥相比，生物有机肥在增加苜蓿生物量方面更为有效。高剂量处理苜蓿的氮吸收显着高于低剂量处理。化肥处理对土壤氮素利用率的影响程度依次为：中剂量，高剂量或低剂量施肥，单一化学肥料和无主成分分析肥料。为了可能的潜在应用，建议在潮水盐渍土区域中施用中等剂量的生物有机肥料。