P. A. Opala

603 total citations
26 papers, 448 citations indexed

About

P. A. Opala is a scholar working on Soil Science, Plant Science and Agronomy and Crop Science. According to data from OpenAlex, P. A. Opala has authored 26 papers receiving a total of 448 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Soil Science, 11 papers in Plant Science and 10 papers in Agronomy and Crop Science. Recurrent topics in P. A. Opala's work include Soil Carbon and Nitrogen Dynamics (8 papers), Agronomic Practices and Intercropping Systems (7 papers) and Phosphorus and nutrient management (7 papers). P. A. Opala is often cited by papers focused on Soil Carbon and Nitrogen Dynamics (8 papers), Agronomic Practices and Intercropping Systems (7 papers) and Phosphorus and nutrient management (7 papers). P. A. Opala collaborates with scholars based in Kenya, Uganda and Rwanda. P. A. Opala's co-authors include C. O. Othieno, J. R. Okalebo, P. Kisinyo, S. Gudu, Omwoyo Ombori, Mathews M. Dida, John M. Maingi, John Muoma, W. K. Ng’etich and Alice Amoding and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLoS ONE and Scientia Horticulturae.

In The Last Decade

P. A. Opala

24 papers receiving 434 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
P. A. Opala Kenya 13 255 208 162 67 39 26 448
Rongzong Cui China 12 336 1.3× 261 1.3× 125 0.8× 51 0.8× 72 1.8× 17 521
P. Kisinyo Kenya 12 176 0.7× 163 0.8× 103 0.6× 45 0.7× 38 1.0× 19 399
A. R. Mubarak Sudan 12 140 0.5× 217 1.0× 79 0.5× 34 0.5× 33 0.8× 30 351
Wutem Sunny Ejue Nigeria 8 182 0.7× 228 1.1× 82 0.5× 46 0.7× 22 0.6× 13 423
M. Maiorana Italy 11 221 0.9× 280 1.3× 156 1.0× 58 0.9× 33 0.8× 25 464
Limin Chuan China 8 352 1.4× 308 1.5× 218 1.3× 44 0.7× 80 2.1× 19 536
Maninder K. Walia United States 11 255 1.0× 236 1.1× 125 0.8× 26 0.4× 26 0.7× 24 489
Sonali Paul Mazumdar India 11 236 0.9× 262 1.3× 123 0.8× 16 0.2× 34 0.9× 39 448
Juan Carlos Ruíz Spain 8 201 0.8× 294 1.4× 78 0.5× 33 0.5× 63 1.6× 10 397
Gustavo Caione Brazil 12 408 1.6× 231 1.1× 100 0.6× 36 0.5× 12 0.3× 70 567

Countries citing papers authored by P. A. Opala

Since Specialization
Citations

This map shows the geographic impact of P. A. Opala's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by P. A. Opala with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites P. A. Opala more than expected).

Fields of papers citing papers by P. A. Opala

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by P. A. Opala. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by P. A. Opala. The network helps show where P. A. Opala may publish in the future.

Co-authorship network of co-authors of P. A. Opala

This figure shows the co-authorship network connecting the top 25 collaborators of P. A. Opala. A scholar is included among the top collaborators of P. A. Opala based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with P. A. Opala. P. A. Opala is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Opala, P. A.. (2022). The Use of Phosphate Rocks in East Africa: A Review. Agricultural Reviews.
2.
Opala, P. A., et al.. (2020). Effects of Vermicompost, Tithonia Green Manure and Urea on Quality of Swiss Chard (Beta Vulgaris L. Var. Cicla L.) in Kenya. Sustainable Agriculture Research. 9(2). 55–55. 2 indexed citations
3.
Kisinyo, P., P. A. Opala, & S. Gudu. (2019). Response of Sorghum (Sorghum bicolor (L.) Munch) and Chemical Characteristics of Soil to Organic and Inorganic Fertilizers on Kenyan Lower Midlands Acid Soil. International Journal of Plant & Soil Science. 1–8. 5 indexed citations
4.
Makonde, Huxley Mae, Mathews M. Dida, P. A. Opala, et al.. (2018). Genetic diversity of symbiotic bacteria nodulating common bean (Phaseolus vulgaris) in western Kenya. PLoS ONE. 13(11). e0207403–e0207403. 18 indexed citations
5.
Dida, Mathews M., P. A. Opala, Omwoyo Ombori, et al.. (2018). Effect of nitrogen sources on the yield of common bean ( Phaseolus vulgaris ) in western Kenya. Journal of Plant Nutrition. 41(13). 1652–1661. 11 indexed citations
6.
7.
Opala, P. A., et al.. (2015). Effects of Tithonia diversifolia, farmyard manure and urea, and phosphate fertiliser application methods on maize yields in western Kenya. SHILAP Revista de lepidopterología. 8 indexed citations
8.
Kisinyo, P., et al.. (2015). Micro-Dosing of Lime, Phosphorus and Nitrogen Fertilizers Effect on Maize Performance on an Acid Soil in Kenya. Sustainable Agriculture Research. 4(2). 21–21. 14 indexed citations
9.
Kisinyo, P., P. A. Opala, S. Gudu, et al.. (2014). Recent advances towards understanding and managing Kenyan acid soils for improved crop production. African Journal of Agricultural Research. 9(31). 2397–2408. 28 indexed citations
10.
Dida, Mathews M., P. A. Opala, Omwoyo Ombori, et al.. (2014). Symbiotic Efficiency of Native Rhizobia Nodulating Common Bean (Phaseolus vulgaris L.) in Soils of Western Kenya. International Scholarly Research Notices. 2014. 1–8. 39 indexed citations
11.
Opala, P. A.. (2014). Response of Maize to Organic and Inorganic Sources of Nutrients in Acid Soils of Kenya. American Journal of Experimental Agriculture. 4(6). 713–723. 1 indexed citations
12.
13.
Opala, P. A., et al.. (2013). Response of the African nightshade to phosphate fertilizer application in Western Kenya. Archives of applied science research. 5(1). 195–201. 3 indexed citations
14.
Kisinyo, P., C. O. Othieno, S. Gudu, et al.. (2013). IMMEDIATE AND RESIDUAL EFFECTS OF LIME AND PHOSPHORUS FERTILIZER ON SOIL ACIDITY AND MAIZE PRODUCTION IN WESTERN KENYA. Experimental Agriculture. 50(1). 128–143. 52 indexed citations
15.
Opala, P. A.. (2011). Comparative effects of lime and organic materials on selected soil chemical properties and nutrient uptake by maize in an acid soil. Archives of applied science research. 3(1). 96–107. 7 indexed citations
16.
Opala, P. A.. (2011). Management of organic inputs in East Africa: A review of current knowledge and future challenges. Archives of applied science research. 3(1). 65–76. 1 indexed citations
17.
Opala, P. A., J. R. Okalebo, C. O. Othieno, & P. Kisinyo. (2009). Effect of organic and inorganic phosphorus sources on maize yields in an acid soil in western Kenya. Nutrient Cycling in Agroecosystems. 86(3). 317–329. 32 indexed citations
18.
Opala, P. A., et al.. (2009). AGRONOMIC AND ECONOMIC EVALUATION OF PYMARC ON MAIZ E YIELD IN RIFT VALLEY PROVINCE OF KENYA. 2(1). 6–11.
19.
Opala, P. A., C. O. Othieno, J. R. Okalebo, & P. Kisinyo. (2009). EFFECTS OF COMBINING ORGANIC MATERIALS WITH INORGANIC PHOSPHORUS SOURCES ON MAIZE YIELD AND FINANCIAL BENEFITS IN WESTERN KENYA. Experimental Agriculture. 46(1). 23–34. 19 indexed citations
20.
Opala, P. A., Bashir Jama, C. O. Othieno, & J. R. Okalebo. (2007). EFFECT OF PHOSPHATE FERTILIZER APPLICATION METHODS AND NITROGEN SOURCES ON MAIZE IN WESTERN KENYA: AN AGRONOMIC AND ECONOMIC EVALUATION. Experimental Agriculture. 43(4). 477–487. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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