Article Number: PRJA14314759


Vol. 1 Issue 3, pp: (33-43), June 2016.
Article Number: PRJA14314759
Copyright ©2016
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Full Length Research Paper

Assessment of Soil Nutrients under Maize Intercropping System Involving Soybean

Aaron Owusu1* and Adams Sadick1   

1Department of Soil Chemistry and Mineralogy, Soil Research Institute, Kumasi, Ashanti Region, Ghana.

*Corresponding Author Email: a.owusubadu@csir-soilresearch.org

 Received: February 29, 2016  Accepted: May 12, 2016  Published: May 31, 2016

ABSTRACT

This study was conducted to examine the influence of soybean – maize intercropping on soil fertility. Maize was grown sole and as an intercrop with soybean and NPK 90 – 60 – 60 kg/ha fertilizer was used. Soil samples were collected and analysed before the experiment was installed and after the experiment. Results indicated that the soil was moderately slightly acid (pH =5.63), low total nitrogen (0.1%) and very low available phosphorus (4.95 mg/kg). After the experiment results revealed that soil variables which increased were the organic carbon (0.15%), phosphorus (5.25 mg/kg), calcium (0.54 cmol (+)/kg), and sodium (0.06 cmol (+)/kg) and those decreased were the total nitrogen (0.02%), magnesium (0.54 cmol (+)/kg) and potassium (0.12 cmol (+)/kg). Furthermore, correlation analysis indicated that organic carbon and available phosphorus correlated positively with all other parameters. Nitrogen correlated positively with calcium (r =0.9747, P =0.1434), potassium (r =0.9884, P =0.0972) and magnesium (r =0.9716, P =0.1521), organic carbon (r =0.8811, P =0.3136) and phosphorus (r =0.9512, P =0.1997). However, nitrogen and potassium were negatively correlated. Based on the findings of this study it is recommended that long term experimentation with multiple replicates in which NPK would be applied in varying rates and nutrients omissions while giving option for sole soybean in a continuous cropping is the best option. This would help to ascertain the usefulness of soybean in supplementing nutrient N gap in the soil when included in the maize cropping systems.

Key words: Intercropping, soil fertility.