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Donnish Journal of Horticulture and Forestry

June 2015 Vol. 1(1), pp. 001-011

Copyright 2015 Donnish Journals




Original Research Paper


Soil Chemical Properties as Influenced by Albizia lebbeck Benth (Rattle Tree) under Agri-Silvicultural System (Alley Cropping) with Solanum tuberosum Linn. (Potato)


Kareem, I. A.

Department of Plant Science and Biotechnology, Faculty of Science, Adekunle Ajasin University, Akungba Akoko, Ondo State, Nigeria.

Corresponding Author E-mail: driakareem@yahoo.com

Accepted 23rd April, 2015.



Abstract


This study was conducted (on alfisol) in the Jos Plateau-Nigeria, to assess the effect of Albizia lebbeck Benth (its green manure and tree rows) on soil chemical properties under alley cropping (an agro-forestry system) with Irish potato (Solanum tuberosum L.). The experiment was a randomized complete block design (RCBD) comprising five treatments and three replicates. Pre and post experimental soil sample analysis on soil pH, % organic carbon, %Nitrogen, available phosphorus, exchangeable cations (Ca, Mg, K, Na), exchangeable acidity and effective cation exchange capacity (ECEC) were done. Tending operations and data collection on apparent growth and yield parameters throughout the five cropping seasons were carried out. Results indicated that the soils in the study area which developed from the biotite granite of the Jos Plateau were very low in organic matter and % Nitrogen and the values decreased from pre-planting to after planting due to absorption by the plants/crop removal (no significant differences among treatments and blocks). But the treatments (A. lebbeck green manure and its tree rows) significantly influenced the available Pat 0 10 cm (P=0.05) and K at 0 10 cm (P=0.05) and 10 25 cm (P=0.01) soil depths. Block effects were observed at significant level on the pH (H2O) at 10 25 cm (at P=0.01) and 25 40 cm depths (P=0.05) and on Mg at 0 10 cm depth (P=0.01). The available P decreased generally from the surface soil (down wards) to the subsoil in the study site owing to absorption by the plants/crop removal and leaching. The values of exchangeable acidity and effective cation exchange capacity increased generally from surface soil to the sub-soil probably due to leaching or infiltration of the exchangeable cations. Thus, the apparent growth parameters (plant height, leaf count and collar girth) except stem count were highly influenced by the different levels of Albizia lebbeck green manure application and its tree rows (sequel to N2- fixation) at P <0.1 which subsequently brought about different values in yield (tuber count (P <0.5) and tuber weight (P < 0.01) of the crop (Irish potato) in all the 5 treatments and throughout the 5 cropping seasons.

Keywords: Soil chemical properties, Albizia lebbeck, influence, agrisilviculture, potato.

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Cite This Article:

Kareem, I. A. Soil Chemical Properties as Influenced by Albizia lebbeck Benth (Rattle Tree) under Agri-Silvicultural System (Alley Cropping) with Solanum tuberosum Linn. (Potato). Donnish Journal of Horticulture and Forestry. 1(1) 2015 pp. 001-011.


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