An experiment was established in 1986 to examine the contribution of Tephrosia candida and Cajanus cajan shrubs to improving the productivity of an acid soil. The main treatments were N levels (0 and 60 kg ha-1) with subplots of maize/natural bush, maize/Tephrosia candida, maize/Cajanus cajan, maize + cassava/natural bush, maize + cassava/Tephrosia candida, and maize + cassava/Cajanus cajan. In 1988, all plots were cleared and maize uniformly planted to study the residual effects of the treatments. No residual effects of N application were observed. Tephrosia candiada and Cajanus cajan increased surface soil organic carbon and total N levels over the natural bush. However, only Tephrosia candida plots produced improved maize grain and stover yield. Highly significant correlations were found between maize grain yield and earleaf N (r=0.73**), grain N (r=0.51**), and stover N (r=0.54**) contents. These results suggest that Tephrosia candida increased N availability in the soil. Therefore, the shrub has potential for improving the productivity of acid soils under traditional systems, where N is limiting due to the absence of N2-fixing legumes in the natural bush fallow.
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Aweto P M 1981 Secondary succession and soil fertility restoration in southwestern Nigeria. III. Soil and vegetation interrelationships. J. Ecology 69, 957–963.
Date R A 1973 Nitrogen, a major limitation in the productivity of natural communities, crops and pastures in the Pacific area. Soil Biol. Biochem. 5, 5–18.
Ewel J J 1976 Designing agricultural ecosystems for the humid tropics. Annu. Rev. Ecol. Syst. 17, 245–271.
Gichuru M P and Kang B T 1989 Calliandra calothyrsus (Meissn.) in an alley cropping system with sequentially cropped maize and cowpea in southwestern Nigeria. Agrof. Syst. 9, 191–203.
Jaiyebo E O and Moore A W 1964 Soil fertility and nutrient storage in different soil-vegetation systems in a tropical rainforest environment. Tropical Agric. (Trin.) 41, 130–138.
Juo A S R and Lal R 1977 The effect of fallow and continuous cultivation on the chemical and physical properties of an Alfisol in western Nigeria. Plant and Soil 47, 567–584.
Kang B T and Wilson G F 1987 The development of alley cropping as a promising agroforestry technology. In Agroforestry: A Decade of Development. Eds. H ASteppler and P K RNair. International Council for Research in Agroforestry, Nairobi, Kenya.
MacDicken K G 1990 Agroforestry management in the humid tropics, In Agroforestry: Classification and Management. Eds. K GMacDicken and N TVergara. pp 98–149. Wiley, New York.
Nye P H 1958 The relative importance of fallow and soils in storing plant nutrients in Ghana. J. West Afri. Sci. Assoc. 4, 31–41.
Nye P H and Greenland D J 1960 Soils under Shifting Cultivation. Tech. Communication 51. Commonwealth Bureau of Soils, Farnham, UK.
Padwick G W 1983 Fifty years of experimental agriculture. II. The maintenance of soil fertility in tropical Africa: A review. Expl. Agric. 19, 293–310.
Raintree J B 1990 Theory and practice for agroforestry diagnosis and design. In Agroforestry: Classification and Management. Eds. K GMacDicken and N TVergara. pp 58–97. Wiley, New York.
SAS Institute Staff 1985 SAS Users' Guide, 1985 Ed. Statistical Analysis Systems Institute Inc., Cary, NC.
Tel D and Rao P 1982 Automated and semi-automated methods for soil and plant analysis. IITA Manual Series No. 7. Intern. Inst. Trop. Agric., Ibadan, Nigeria.
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Gichuru, M.P. Residual effects of natural bush, Cajanus cajan and Tephrosia candida on the productivity of an acid soil in southeastern Nigeria. Plant Soil 134, 31–36 (1991). https://doi.org/10.1007/BF00010714
- fallow management
- humid forest
- nutrient cycling