Aria Marzieh Mohammady, Lakzian Amir, Haghnia Gholam Hosain, Berenji Ali Reza, Besharati Hosein, Fotovat Amir
Department of Soil Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad 91779, Iran.
Bioresour Technol. 2010 Jan;101(2):551-4. doi: 10.1016/j.biortech.2009.07.093. Epub 2009 Sep 6.
Sulfur, organic matter, and inoculation with sulfur-oxidizing bacteria are considered as amendments to increase the availability of phosphorus from rock phosphate. The present study was conducted to evaluate the best combination of sulfur, vermicompost, and Thiobacillus thiooxidans inoculation with rock phosphate from Yazd province for direct application to agricultural lands in Iran. For such study, an experiment was carried out in a completely randomized design with factorial arrangement: Elemental sulfur originated from Sarakhs mine at three rates, 0% (S1), 10% (S2), 20% (S3), vermicompost at two rates, 0% (V1), 15% (V2), and inoculation without (B1) and with (B2) T. thiooxidans, in three replications. The results showed that water-soluble phosphorus (WSP) content was significantly higher in inoculated treatments compared to non-inoculated treatments. Sulfur had a significant effect on WSP. The highest solubility rate of rock phosphate was obtained in 20% of sulfur (S3) treatments and it was 2.4 times more than S1 treatments. Vermicompost also had a significant and positive effect on WSP of rock phosphate dissolution. The results also revealed that the highest concentration of WSP, sulfate and the lowest pH were obtained in treatments with 20% sulfur, 15% vermicompost inoculated with T. thiooxidans (B2S3V2).
硫、有机质以及接种硫氧化细菌被视为提高磷矿粉中磷有效性的改良剂。本研究旨在评估硫、蚯蚓堆肥和氧化硫硫杆菌接种与来自亚兹德省的磷矿粉的最佳组合，以便直接应用于伊朗的农田。为此，进行了一项完全随机设计的析因实验：元素硫来自萨拉赫斯矿，设置三个用量水平，分别为0%（S1）、10%（S2）、20%（S3）；蚯蚓堆肥设置两个用量水平，分别为0%（V1）、15%（V2）；接种处理分为不接种（B1）和接种氧化硫硫杆菌（B2），重复三次。结果表明，接种处理的水溶性磷（WSP）含量显著高于未接种处理。硫对水溶性磷有显著影响。在20%硫（S3）处理中，磷矿粉的溶解率最高，是S1处理的2.4倍。蚯蚓堆肥对磷矿粉溶解的水溶性磷也有显著的正向影响。结果还表明，在20%硫、15%蚯蚓堆肥且接种氧化硫硫杆菌（B2S3V2）的处理中，水溶性磷、硫酸盐的浓度最高，pH值最低。
