Abstract
Promiscuous soyabean varieties have potential to contribute significantly to income generation, food security and soil N budgets on smallholder farms. One of the major factors limiting this potential is farmers’ preference to allocate nutrient resources to food security cereal crops on the most fertile fields, leaving grain legumes to grow on residual fertility on infertile fields. Two experiments were conducted to: (i) compare the current farmer practice with targeting manure and single super phosphate (SSP) to soyabean in a three-year rotation cycle on two fields with different soil fertility: an infertile sandy soil and a more fertile clay soil; and (ii) assess the effects of variability of soil fertility within and across farms on productivity of soyabean and groundnut. In the first experiment, soyabean (<0.2 t ha−1) and maize yields (<0.7 t ha−1) without fertilizer were poor on a degraded sandy soil. Both crops responded poorly to SSP due to deficiency of other nutrients. Manure application significantly increased soyabean and maize yields, led to yield stabilization over three seasons and also significantly increased the proportion of N2 fixed by soyabean (measured using 15N natural abundance) from 60% to 83%. On the sandy soil, P was used more efficiently and gross margins were greater when SSP and manure were applied to maize in a maize–soyabean rotation. Soyabean and maize yields without fertilizer inputs were larger on clay soil with moderate fertility (0.4–0.7 t ha−1 and 2.0–2.3 t ha−1 respectively) and were significantly increased by application of SSP and manure. Within rotations, P recovery was higher when manure and SSP were applied to maize (43 and 25%) than when applied to soyabean (20 and 19%). However, application of manure to soyabean on the clay was more profitable than application to maize for individual crops and within rotations. In the second experiment, soyabean and groundnut yields were largest (∼1 and ∼0.8 t ha−1 respectively) on plots closest to homesteads on wealthy farms, which were more fertile due to good past management. Yields were poor (< 0.5 t ha−1) on other fields which previously had received little nutrient inputs. Soyabean and groundnut yields correlated well with available P (R 2 = 0.5–0.7) and soil organic C (SOC) contents (R 2 = 0.4–0.6). For smallholder farmers to maximise benefits from legume production they need to focus attention on the more fertile plots, although production should be optimized in relation to maize. Targeting nutrients to maize as currently practiced by farmers was more efficient and economic under poor soil fertility conditions, whilst potential exists to increase income by targeting manure to soyabean on the more fertile soils.
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References
Ae N, Otani T, Makino T, Tazawa J (1996) Role of cell wall of groundnut roots in solubilizing sparingly soluble phosphorus in soil. Plant and Soil 186:197–204
Agricultural Economics and Marketing Division (2001) The agricultural sector of Zimbabwe Staistical Bulletin-2001. Ministry of Lands, Agriculture & Rural Resettlement, Harare
Anderson JM, Ingram JSI (1993) Tropical soil biology and fertility: a handbook of methods. CAB International Wallingford, UK
Aune JB, Lal R (1997) Agricultural productivity in the tropics and critical limits of properties of Oxisols, Ultisols, and Alfisols. Trop Agric 74:96–103
Boddey RM, Peoples MB, Palmer B, Dart PJ (2000) Use of the 15N natural abandance technique to quantify biological nitrogen fixation by woody perennials. Nutr Cycl Agroecosys 57:235–270
Boddey RM, Sa JC, Alves BJ, Urquiaga S (1997) The contribution of biological nitrogen fixation for sustainable agriculture systems in the tropics. Soil Biol Biochem 29:787–799
Buresh RJ, De Datta SK (1991) Nitrogen dynamics and management in rice-legume cropping systems. Adv Agron 45:1–59
Carsky RJ (2003) Response of cowpea and soybean to P and K on terre de barre soils in southern Benin. Agric, Ecosyst Environ 100:241–249
Chikowo R, Tagwira F, Piha M (1999) Agronomic effectiveness of poor quality manure supplemented with phosphate fertilizer on maize and groundnut in a maize-groundnut rotation. Afr Crop Sci J 7:383–395
De Ridder N, Van Keulen H (1990) Some aspects of the role of organic matter in sustainable intensified arable farming in west-African semi-arid-tropics (SAT). Fert Res 26:299–310
Giller KE (2001) Nitrogen fixation in tropical cropping systems. CAB International, Walliford, UK
Giller KE, Cadisch G (1995) Future benefits from biological nitrogen fixation: an ecological approach to agriculture. Plant and Soil 174:255–277
Giller KE, Cadish G, Ehaliotis C, Adams E, Sakala WD, Mafongoya PL (1997) Building soil nitrogen capital in Africa. In: Buresh RJ, Sanchez PA, Calhoun F (Eds) Replenishing soil fertility in Africa. Soil Science Society of America Special Publication No. 51, Madison, Wisconsin, USA, pp 81–95
Kasasa P, Mpepereki S, Musiyiwa K, Makonese F, Giller KE (1999) Residual nitrogen benefits of promiscuous soybeans to maize under field conditions. Afr Crop Sci J 7:375–382
McNeill AM, Zhu C, Fillery IRP (1997) Use of in situ 15N-labelling to estimate the total below-ground nitrogen of pasture legumes in intact soil-plant systems. Aust J Agric Res 48:295–304
Moll HAJ (2003) Costs and benefits of livestock systems and the role of market and non-market relationships. Agric Econ 32:181–193
Mpepereki S, Javaheri F, Davis P, Giller KE (2000) Soyabeans and sustainable agriculture: Promiscuous soybean in southern Africa. Field Crops Res 65:137–149
Mpepereki S, Pompi I (2003) Promoting new BNF technologies among smallholder farmers: A success story from Zimbabwe. In: Waddington SR (ed) Grain legumes and green manures for soil fertility in Southern Africa: taking stock of progress. Proceedings of a Conference held 8–11 October 2002 at Leopard Rock Hotel, Vumba, Zimbabwe, Harare, Zimbabwe, pp 33–38
Musiyiwa K, Mpepereki S, Giller KE (2005) Symbiotic effectiveness and host ranges of indigenous rhizobia nodulating promiscuous soyabean varieties in Zimbabwean soils. Soil Biol Biochem 37:1169–1176
Nyamangara J, Piha M, Kirchmann H (1999) Interactions of aerobically decomposed cattle manure and nitrogen fertilizer applied to soil. Nutr Cycl Agroecosys 54:183–188
Okogun JA, Sanginga N, Abaidoo R, Dashiell KE, Diels J (2005) On-farm evaluation of biological nitrogen fixation potential and grain yield of Lablab and two soyabean varieties in the northern Guinea savanna of Nigeria. Nutr Cycl Agroecosys 73:267–275
Sanchez PA, Shepherd KD, Soule MJ, Place FM, Buresh RJ, Izac AMN (1997) Soil fertility replenishment in Africa: an investment in natural resource capital. In: Buresh RJ, Sanchez PA, Calhoun F (eds) Replenishing soil fertility in Africa. Soil Science Society of America Special Publication No. 51, Madison, Wisconsin, USA, pp 1–46
Sanginga N, Dashiell K, Okogun JA, Thottappilly G (2002a) Nitrogen fixation and N contribution by promiscuous nodulating soybeans in the southern Guinea savanna of Nigeria. Plant and Soil 195:257–266
Sanginga N, Okogun J, Vanlauwe B, Dashiell K (2002b) The contribution of nitrogen by promiscuous soybeans to maize based cropping the moist savanna of Nigeria. Plant and Soil 241:223–231
Shumba EM (1983) Do soyabeans have a place in communal areas? Zimbabwe Agric J 80:189–191
Snapp SS, Rohrbach DD, Simtowe F, Freeman HA (2002) Sustainable soil management options for Malawi: can smallholder farmers grow more legumes? Agric, Ecosyst Environ 91:159–174
Svubure O (2000) Contributions of biological nitrogen fixation (BNF) by selected grain legumes to sustainabilty of the maize-based cropping systems in communal areas of Zimbabwe. MPhil Thesis. University of Zimbabwe, Harare, Zimbabwe
Vanlauwe B, Bationo A, Carsky RJ, Diels J, Sanginga N, Schultz S (2003) Enhancing the contribution of legumes and biological nitrogen fixation in cropping systems: Experiences from West Africa. In: Waddington SR (Ed) Grain legumes and green manures for soil fertility in Southern Africa: taking stock of progress. Proceedings of a Conference held 8–11 October 2002 at Leopard Rock Hotel, Vumba, Zimbabwe. Soil Fert Net and CIMMYT-Zimbabwe, Harare, Zimbabwe, pp 3–13
Waddington SR, Karigwindi J (2001) Productivity and profitability of maize plus groundnut rotations compared with continuous maize on smallholder farms in Zimbabwe. Exp Agric 37:83–98
Zingore S, Murwira HK, Delve RJ, Giller KE (2007) Influence of nutrient management strategies on variability of soil fertility, crop yields and nutrient balances on smallholder farms in Zimbabwe. Agric, Ecosyst Environ 119:112–126
Zingore S (2006) Exploring diversity within smallholder farming systems in Zimbabwe: nutrient use efficiencies and resource management strategies for crop production. PhD Thesis. Wageningen University, Wageningen, The Netherlands
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We thank the International Fund for Agricultural Development (IFAD) and the Department for International Development (DFID) for providing funding for this work. The assistance of Francis Dzvene in managing the field experiments is also gratefully acknowledged. Ken Giller thanks the European Union for funding through AfricaNUANCES.
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Zingore, S., Murwira, H.K., Delve, R.J. et al. Variable grain legume yields, responses to phosphorus and rotational effects on maize across soil fertility gradients on African smallholder farms. Nutr Cycl Agroecosyst 80, 1–18 (2008). https://doi.org/10.1007/s10705-007-9117-3
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DOI: https://doi.org/10.1007/s10705-007-9117-3