|International Research Journal of Agricultural Science and Soil Science (ISSN: 2251-0044) Vol. 7(2) pp. 018-025, April 2017. DOI: http:/dx.doi.org/10.14303/irjas.2016.031. Copyright © 2017 International Research Journals|
Full Length Research Paper
Selected soil chemical properties as affected by cropping system, nitrogen fertilizer and locations
Sebetha E.T1, Modi A.T2, Owoeye L.G3
1Crop Science Department, Faculty of Agriculture, Science and Technology, Northwest, University, Mafikeng Campus, Private Bag x 2046, Mmabatho 2735.
2Crop Science, School of Agriculture, Earth and Environmental Sciences, University of KwaZulu-Natal, Private Bag x 01, Scottsville 3209
3ARC-IIC, Private Bag x 82075, Rustenburg 0300
*Corresponding Author’s E-mail: Erick.Sebetha@nwu.ac.za
Received October 14, 2016; Accepted November 15, 2016
The type of cropping system that increase the soil chemical properties is very complex and the correlation between soil chemical properties on maize need to be addressed. In this way, the study was conducted to investigate the effect of cropping system, location and nitrogen fertilizer on soil chemical properties. A factorial experiment randomized in complete block design with two replications was conducted during 2011/12 and 2012/13 planting seasons. The experiment consisted of five management systems, namely, mono cropping cowpea, Mono cropping maize, rotational maize, rotational cowpea and intercropping maize-cowpea. The amount of 0 and 95; 0 and 92; 0 and 113.5 kg N ha-1 were applied on maize plots, while the amount of 0 and 20; 0 and 17; 0 and 23.5 kg N ha-1 were applied on cowpea plots at Potchefstroom, Rustenburg and Taung respectively. The laboratory analysis involved soil N-NO3, N-NH4, Bray 1-P and exchangeable K. Soil collected from cowpea plots planted on mono cropping and rotational systems had significantly (P < 0.05) higher soil N-NO3 than soil collected at other cropping systems. Soil collected at maize plot planted on mono cropping and intercropping systems had significantly (P < 0.05) higher Bray 1-P than soil collected on other cropping systems. Location had significant (P < 0.05) effect on Bray 1-P, N-NO3 and exchangeable K. It was revealed that cropping system and location play a pivotal role on soil chemical properties.
Keywords: Soil N-NO3, Soil N-NH4, Bray 1-P, Exchangeable K.