Agronomic effectiveness of biofertilizers with phosphate rock, sulphur and Acidithiobacillus for yam bean grown on a Brazilian tableland acidic soil |
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| Authors: | Stamford N P Santos P R Santos C E S Freitas A D S Dias S H L Lira M A |
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| Institution: | 1. Facultad de Ciencias Agronómicas y Veterinarias, Universidad Autónoma de Santo Domingo, Dominican Republic;2. Departamento de Microbiología y Genética, Universidad de Salamanca, Edificio Departamental de Biología, Lab 209, Av. Doctores de la Reina S/N, 37007 Salamanca,Spain;3. Departamento de Ingeniería Agrícola y Forestal, Universidad de Valladolid, Campus de Palencia, Av. De Madrid, 57, 34004 Palencia, Spain;4. Instituto de Medio Ambiente, Recursos Naturales y Biodiversidad, Universidad de León, Campus ESTIA, Av. de Portugal, 41, 24071 León, Spain;1. Department of Soil Science, Federal University of Santa Maria, Santa Maria, Brazil;2. IC2MP-HydrASA UMR 7285, Université de Poitiers, Poitiers, France;3. Integrated Regional University of Alto Uruguai and Missões, URI, Brazil;4. Federal University of Santa Maria, Santa Maria, Brazil;5. INRA Poitou-Charentes, Lusignan, France;6. Department of Soil Science, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;1. Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing 100875, China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, Shanxi 710061, China;3. CAS Center for Excellence in Quaternary Science and Global Change, Xi’an 710061, China;4. Xi’an Institute for Innovative Earth Environment Research, Xi’an 710061, China;5. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Phosphate rocks have low available P and soluble P fertilizers have been preferably used in plant crop production, although economic and effective P sources are needed. Experiments were carried out on a Brazilian Typic Fragiudult soil with low available P to evaluate the agronomic effectiveness of phosphate rock (PR) compared with soluble phosphate fertilizer. Yam bean (Pachyrhizus erosus) inoculated with rhizobia (strains NFB 747 and NFB 748) or not inoculated was the test crop. Biofertilizers were produced in field furrows by mixing phosphate rock (PR) and sulphur inoculated with Acidithiobacillus (S+Ac) in different rates (50, 100, 150 and 200 g S kg(-1) PR), with 60 days of incubation. Treatments were carried out with PR; biofertilizers B(50), B(100), B(150), B(200); triple super phosphate (TSP); B(200) without Acidithiobacillus and a control treatment without P application (P(0)). TSP and biofertilizers plus S inoculated with Acidithiobacillus increased plant growth. Soil acidity and available P increased when biofertilizers B(150) and B(200) were applied. We conclude that biofertilizers may be used as P source; however, long term use will reduce soil pH and potentially reduce crop growth. |
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