Greenhouse pot experiments were carried out in 2013 and 2014 at the University of Bonn, Germany, to study the effect of combined fertilization of rock phosphate (RP) with elemental sulphur (ES) on growth, grain yield and nutrient uptake of soybean. Treatments included RP, ES, combined application (RPES), triple superphosphate (SP), magnesium sulphate (MgS), SP and magnesium sulphate (SPMgS) and an unfertilized control. Combined fertilization (RPES) resulted in a significant increase of soil-plant analysis development (SPAD) values, grain yield, yield components and nitrogen and in part phosphorus uptake of the shoot. Single application of RP or ES only tended to affect crop growth and nutrient uptake. Application of MgS and/or SP significantly increased grain yield in both years suggesting an effect of sulphate.
Attoe O.J., Olson R.A. (1966): Factors affecting rate of oxidation in soils of elemental sulphur and that added in rock phosphate –
Sulphur fusions. Soil Science, 101: 317–325.
Board J. E., Tan Qiang (1995): Assimilatory Capacity Effects on Soybean Yield Components and Pod Number. Crop Science, 35, 846- https://doi.org/10.2135/cropsci1995.0011183X003500030035x
Carsky R. J., Singh B. B., Oyewole B. (2001): Contribution of Early Season Cowpea to Late Season Maize in the Savanna Zone of West Africa. Biological Agriculture & Horticulture, 18, 303-315 https://doi.org/10.1080/01448765.2001.9754894
(2013): Effect of Phosphorus Fertilizers on Growth and Physiological Phosphorus Use Efficiency of Three Soy Bean Cultivars. IOSR Journal of Agriculture and Veterinary Science, 3, 32-36 https://doi.org/10.9790/2380-0363236
Dubey S.K. (1997): Co-inoculation of phosphorus solubilizing bacteria with Bradyrhizobium japonicum to increase phosphate availability to rainfed soybean in Vertisol. Journal of the Indian Society of Soil Science, 45: 506–509.
Dwyer L. M., Stewart D. W., Gregorich E., Anderson A. M., Ma B. L., Tollenaar M. (1995): Quantifying the nonlinearity in chlorophyll meter response to corn leaf nitrogen concentration. Canadian Journal of Plant Science, 75, 179-182 https://doi.org/10.4141/cjps95-030
Egamberdiyeva D., Qarshieva D., Davranov K. (2004): The Use of Bradyrhizobium to Enhance Growth and Yield of Soybean in Calcareous Soil in Uzbekistan. Journal of Plant Growth Regulation, 23, - https://doi.org/10.1007/s00344-004-0069-4
Evans J., McDonald L., Price A. (2006): Application of reactive phosphate rock and sulphur fertilisers to enhance the availability of soil phosphate in organic farming. Nutrient Cycling in Agroecosystems, 75, 233-246 https://doi.org/10.1007/s10705-006-9030-1
Fontes P.C.R., de Araujo C. (2006): Use of a chlorophyll meter and plant visual aspect for nitrogen management in tomato fertigation. Journal of Applied Horticulture, 8: 8–11.
Giller K. E., Cadisch G. (1995): Future benefits from biological nitrogen fixation: An ecological approach to agriculture. Plant and Soil, 174, 255-277 https://doi.org/10.1007/BF00032251
HAY RKM, GILBERT RA (2001): Variation in the harvest index of tropical maize: evaluation of recent evidence from Mexico and Malawi. Annals of Applied Biology, 138, 103-109 https://doi.org/10.1111/j.1744-7348.2001.tb00090.x
Herbert S. J., Litchfield G. V. (1982): Partitioning Soybean Seed Yield Components1. Crop Science, 22, 1074- https://doi.org/10.2135/cropsci1982.0011183X002200050044x
JANZEN H. H., BETTANY J. R. (1987): OXIDATION OF ELEMENTAL SULFUR UNDER FIELD CONDITIONS IN CENTRAL SASKATCHEWAN. Canadian Journal of Soil Science, 67, 609-618 https://doi.org/10.4141/cjss87-057
Jarrell W.M., Beverly R.B. (1981): The dilution effect in plant nutrition studies. Advances in Agronomy, 34: 197–224.
Kittams H. A., Attoe O. J. (1965): Availability of Phosphorus in Rock Phosphate-Sulfur Fusions1. Agronomy Journal, 57, 331- https://doi.org/10.2134/agronj1965.00021962005700040006x
Kumaga F.K., Ofori K. (2004): Response of soybean (Glycine max (L.) Merrill) to Bradyrhizobia inoculation and phosphorus application. International Journal of Agriculture and Biology, 6: 324–327.
Lipman Jacob G., Director , McLean Harry C., Lint H. Clay (1916): THE OXIDATION OF SULFUR IN SOILS AS A MEANS OF INCREASING THE AVAILABILITY OF MINERAL PHOSPHATES. Soil Science, 1, 533-540 https://doi.org/10.1097/00010694-191606000-00002
Ma B. L., Morrison M. J., Voldeng H. D. (1995): Leaf Greenness and Photosynthetic Rates in Soybean. Crop Science, 35, 1411- https://doi.org/10.2135/cropsci1995.0011183X003500050025x
Monje O.A., Bugbee B. (1992): Inherent limitations of nondestructive chlorophyll meters: A comparison of two types of meters. Horticultural Science, 27: 69–71.
Mustafa K.K., Darwesh D.A., Luay A.A. (2004): Effect of mycorrhiza, phosphorus and urea on ammonia volatilization and soybean growth. Journal Dohuk University, 7: 101–105.
Rajan SSS (1983): Effect of sulphur content of phosphate rock/sulphur granules on the availability of phosphate to plants. Fertilizer Research, 4, 287-296 https://doi.org/10.1007/BF01049485
Rajan SSS (1987): Phosphate rock and phosphate rock/sulphur granules as phosphate fertilizers and their dissolution in soil. Fertilizer Research, 11, 43-60 https://doi.org/10.1007/BF01049563
Salvagiotti F., Cassman K.G., Specht J.E., Walters D.T., Weiss A., Dobermann A. (2008): Nitrogen uptake, fixation and response to fertilizer N in soybeans: A review. Field Crops Research, 108, 1-13 https://doi.org/10.1016/j.fcr.2008.03.001
Salvagiotti Fernando, Ferraris Gustavo, Quiroga Alberto, Barraco Mirian, Vivas Hugo, Prystupa Pablo, Echeverría Hernan, Gutiérrez Boem Flavio Hernán (2012): Identifying sulfur deficient fields by using sulfur content; N:S ratio and nutrient stoichiometric relationships in soybean seeds. Field Crops Research, 135, 107-115 https://doi.org/10.1016/j.fcr.2012.07.011
Schofield P. E., Gregg P. E. H., Syers J. K. (1981): ‘Biosuper’ as a phosphate fertiliser: A glasshouse evaluation. New Zealand Journal of Experimental Agriculture, 9, 63-67 https://doi.org/10.1080/03015521.1981.10427804
Schou J. B., Jeffers D. L., Streeter J. G. (1978): Effects of Reflectors, Black Boards, or Shades Applied at Different Stages of Plant Development on Yield of Soybeans1. Crop Science, 18, 29- https://doi.org/10.2135/cropsci1978.0011183X001800010009x
Schüller H. (1969): The CAL method, a new method for the determination of plant available phosphate in soil. Zeitschrift für Pflanzenernährung und Bodenkunde, 23: 48–63. (In German)
SCHULZE J. (2006): Nitrogen Fixation by White Lupin under Phosphorus Deficiency. Annals of Botany, 98, 731-740 https://doi.org/10.1093/aob/mcl154
Stamford Newton Pereira, Santos Patrícia Ribeiro dos, Moura Adriana Muniz Mendes Freire de, Santos Carolina Etiene de Rosália e Silva, Freitas Ana Dolores Santiago de (2003): Biofertilzers with natural phosphate, sulphur and Acidithiobacillus in a siol with low available-P. Scientia Agricola, 60, 767-773 https://doi.org/10.1590/S0103-90162003000400024
Steffens D. (2011): Phosphorus availability of rock phosphate and single superphosphate as related to soil structure and soil moisture. Annals of Agricultural Sciences, 9: 82–87.
Wächter K., Gruber S., Claupein W. (2013): Do soybean inoculants differ in their inoculation efficacy? Journal für Kulturpflanzen, 65: 401–410. (In German)
Walker R.L., Watson C.A., Rees R.M., Stockdale E.A. (2006): Improving supply and phosphorus use efficiency in organic farming systems. Aspects of Applied Biology, 79: 311–315.