DYNAMICS OF ORGANIC CARBON AND PHOSPHORUS ON A SOYBEAN FIELD AMENDED WITH BIOFERTILIZERS, ORGANIC AND INORGANIC FERTILIZERS

M. O. Adigun¹*, O. A. Babalola², I. O. Abiola³, O.O Afolabi¹ and N. E. Etukudoh⁴

^1*Department of Biological Sciences, Crawford University, Faith City, Igbesa, Ogun State, ²Department of Soil Science and Land Management, Federal University of Agriculture, Abeokuta, Nigeria

³Crop Production Technology Department, Federal College of Forestry, Jericho, Ibadan, Nigeria

⁴Department of Soil Science, Rivers State University of Science and Technology, Port Harcourt,

Email: micadigun@crawforduniversity.edu.ng

ABSTRACT

This study was carried out to examine the dynamics of organic carbon and phosphorus of the soil shown to soybean. The experiment was conducted at the Federal University of Agriculture, Abeokuta, Nigeria. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three treatments to study the effect of poultry manure at 0, 5, 10 tons/ha, phosphorus source chemical fertilizer (SSP, mycorrhizal) and Bradyrhizobium on the growth and yield of soybean (Glycine max). Treatment was replicated three times.  Observations was taken at 4th, 6th, 8th, 10th, 12th and 14th week after planting (WAP) on the Agronomic data of soybean plant. Also the chemical properties of the soil were taken before and at harvesting. Significant difference between the treatments in some growth and yield parameters of soybean were obtained. The result shows that there were different responses of the crop as a result of various treatments. Crops inoculated with treatment performed better in plant height, leaf area, stem girth for growth parameters and in soil minerals (Organic C and available P), while significant difference were observed in yield component such as the weight of 100 seed/hectare. The study concludes that soybean growth and soil obtained minerals was enhanced by the interactive effect of treatments which include the poultry manure, Bradyrhizobium and the phosphorus source (SSP, Mycorrhizal). That is, 5 tons/ha of poultry manure with Mycorrhizal produced the highest yield of soybean within the week interval.

Keywords: Soybean, Mycorrhizal, Bradyrhizobium, Single super phosphate, Poultry manure.