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Richard N. Onwonga

Publications (4)

Comparative Effects of Soil Amendments on Phosphorus Use and Agronomic Efficiencies of Two Maize Hybrids in Acidic Soils of Molo County, Kenya

Richard N. Onwonga, Joyce J. Lelei & Joseph K. Macharia · Journal of Experimental Agriculture International · 2013

 The deficiency of P and the shortened growing seasons due to climate change are identified constraints in the production of commonly grown long maturing maize hybrid (H614) in the acid soils of Molo County, Kenya. The current study therefore investigated (i) the effect of soil a...

Open access Research Article 10.9734/AJEA/2013/4380

Assessment of Spider Plant (Cleome gynandra L.) Germplasm for Agronomic Traits in Vegetable and Seed Production: A Green House Study

Cecilia M. Onyango, Richard N. Onwonga & John W. Kimenju · Journal of Experimental Agriculture International · 2015

Aims: Spider plant (Cleome gynandra L.) is one of the most important traditional vegetables in Kenya, albeit underutilized.  Concurrently, scanty information is available on its potential for vegetable and seed production. The objective of this study was therefore to evaluate spi...

Open access Research Article 10.9734/AJEA/2016/20209

Soil Fungal and Bacterial Populations in White Lupin (Lupinus albus) - Maize (Zea mays L) Cropping System Amended With Minjingu Phosphate Rock

Joyce J. Lelei & Richard N. Onwonga · Journal of Agriculture and Ecology Research International · 2014

Aims: To determine fungal and bacterial populations under white lupin (Lupinus albus) - maize (Zea mays L) cropping system amended with Minjingu Phosphate Rock (MPR). Study Design: A randomized complete block design with four replicates was used. Treatments were; (i) control i.e....

Open access Research Article 10.9734/JAERI/2014/11036

Influence of Amendments Added to Acid Soils on Biochemical Properties, Nitrogen Uptake and Hybrid Maize Yields in Nakuru County, Kenya

Joyce J. Lelei, Richard N. Onwonga & Joseph K. Macharia · International Journal of Plant & Soil Science · 2014

Aim: The current study investigated effect of soil amendments; lime (L), manure (FYM) and minjingu phosphate rock (PR) added to soils on soil microbial biomass carbon and nitrogen (SMB-C and SMB-N), available soil nitrogen (N), crop N uptake and grain yields of two maize hybrids...

Open access Research Article 10.9734/IJPSS/2014/7817