Titles (79)Keywords (1)Abstracts (1)
A new phosphorus fertilizer blend enhances grain legume yield and profitability in northern part of Ghana, Adjei-Nsiah, S. and Ulzen, J.*, in: Scientific African, volume 25, number -: e02273, pages 1-15, ISSN 2468-2276, 2024. [DOI]
 
Additive yield response of chickpea (Cicer arietinum L.) to rhizobium inoculation and phosphorus fertilizer across smallholder farms in Ethiopia, Wolde-Meskel, E., van Heerwaarden, J., Abdulkadir, B., Kassa, S.*, Aliyi, I.*, Degefu, T., Wakweya, K.*, Kanampiu, F. and Giller, K., in: Agriculture, Ecosystems and Environment, volume 261, pages 144-152, ISSN 0167-8809, 2018. [DOI]
 
Aluminum resistance of cowpea as affected by phosphorus-deficiency stress, Jemo, M., Abaidoo, R., Nolte, C. and Horst, W. J., in: Journal of Plant Physiology, volume 164, number 4, pages 442-451, ISSN 0176-1617, 2007.
 
Aluminum resistance of cowpea as affected by phosphorus-deficiency stress, Jemo, M., Abaidoo, R., Nolte, C. and Horst, W. J., in: Journal of Plant Physiology, volume (under review), 2006.
 
Assessment of labile phosphorus fractions and adsorption characteristics in relation to soil properties of West African savanna soils, Nwoke, C., Vanlauwe, B., Diels, J ., Sanginga, P., Osonubi, O.* and Merckx, R ., in: Agriculture, Ecosystems and Environment, volume 100, pages 285-294, ISSN 0167-8809, 2003.
 
Carbon and nitrogen dynamics in a phosphorus deficient soil amended with organic residues and fertilizers in western Kenya, Nziguheba, G., Merckx, R . and Palm, C., in: Biology and Fertility of Soils, volume 41, number 4, pages 240-248, ISSN 0178-2762, 2005.
 
Co-inoculation effect of rhizobia and plant growth promoting rhizobacteria on common bean growth in a low phosphorus soil, Korir, H.*, Mungai, N. W.*, Thuita, M., Hamba, Y.* and Masso, C., in: Frontiers in Plant Science, volume 8, number 141, pages 1-10, ISSN 1664-462X, 2017. [DOI]
 
Combined application of inoculant, phosphorus and organic manure improves grain yield of cowpea, Ulzen, J.*, Abaidoo, R., Ewusi-Mensah, N.* and Masso, C., in: Archives of Agronomy and Soil Science, pages 1-15, ISSN 0365-0340, 2019. [DOI]
 
Combining ability of soybean (Glycine max) for low phosphorus tolerance on acidic soils of western Ethiopia, Abebe, A. T., Githiri, M.*, Derera, J.* and Debele, T.*, in: Plant Breeding, pages 1-9, ISSN 0179-9541, 2020. [DOI]
 
Diallel analysis of soybean (Glycine max L.) for biomass yield and root characteristics under low phosphorus soil conditions in western Ethiopia, Abebe, A. T., Adewale, S., Chigeza, G. and Derera, J., in: PloS ONE, volume 18, number 2: e0281075, pages 1-15, ISSN 1932-6203, 2023. [DOI]
 
Differential phosphorus responses of leguminous cover crops on soils with variable history, Tian, G., Carsky, R. and Kang, B., in: Journal of Plant Nutrition, volume 21, pages 1641-1653, 1998.
 
Differential response of cowpea lines to aluminum and phosphorus application, Kolawole, G., Tian, G. and Singh, B., in: Journal of Plant Nutrition, volume 23, pages 731-740, 2000.
 
Edaphic factors modulating phosphorus availability in lowland rice systems, Nigeria, Mesele, S. A., Ajiboye, G. A.* and Talbot, J., in: Communications in Soil Science and Plant Analysis, volume 55, number 19, pages 2935-2951, ISSN 0010-3624, 2024. [DOI]
 
Effect of co-application of phosphorus fertilizer and in vitro-produced mycorrhizal fungal inoculants on yield and leaf nutrient concentration of cassava, Aliyu, I.*, Yusuf, A. A.*, Uyovbisere, E. O.*, Masso, C. and Sanders, I. R., in: PloS ONE, volume 14, number 6: e0218969, pages 1-19, ISSN 1932-6203, 2019. [DOI]
 
Effect of liming and phosphorus application on performance of Leucaena leucocephala in acid soils, Duguma, B., Kang, B. and Okali, D. U. U., in: Plant and Soil, volume 110, pages 57-61, 1988.
 
Effect of phosphorus (P) application on nutrient uptake, biomass, pod and seed formation in cowpea (Vigna unguiculata (L.) Walp]): proceeding (poster), Suzuki, K., Fatokun, C. and Boukar, O., African Soil Science Society, 2016.
 
Effect of phosphorus (P) application on nutrient uptake, biomass, pod and seed formation in cowpea (Vigna unguiculata), Suzuki, K., Fatokun, C. and Boukar, O., Abstract in the book of abstract p. 66, of the 7th International Conference of the Africa Soil Science Society: critical soil solutions for sustainable development in Africa, 29 May - 1 June, Burkina Faso, Ouagadougou, 2016.
 
Effect of phosphorus application and soybean cultivar on grain and dry matter yield of subsequent maize in the tropical savannas of north-eastern Nigeria, Kamara, A., Kwari, J.*, Ekeleme, F., Omoigui, L. and Abaidoo, R., in: African Journal of Biotechnology, volume 7, number 15, pages 2593-2599, ISSN 1684-5315, 2008.
 
Effect of phosphorus application in legume cover crop rotation on subsequent maize in the savanna zone of West Africa, Carsky, R., Oyewole, B. and Tian, G., in: Nutrient Cycling in Agroecosystems, volume 59, pages 151-159, 2001.
 
Effect of phosphorus application on the performance of some cowpea lines, Suzuki, K., Fatokun, C. and Boukar, O., in: Agronomy Journal, pages 1-12, ISSN 0002-1962, 2021. [DOI]
 
Effect of seed size and phosphorus fertilization on growth of selected legumes, Kolawole, G. and Kang, B., in: Communications in Soil Science and Plant Analysis, volume 28, pages 1223-1235, 1997.
 
Effects of arbuscular mycorrhizal inoculation and phosphorus application on yield and nutrient uptake of yam, Dare, M. O.*, Abaidoo, R., Fagbola, O.* and Asiedu, R., in: Communications in Soil Science and Plant Analysis, volume 41, pages 2729-2743, ISSN 0010-3624, 2010.
 
Effects of lime and phosphorus rates on growth of hybrid Arabica coffee seedlings at Jimma, southwest Ethiopia, Teshale, E.*, Kufa Obso, T. and Regassa, A.*, in: Journal of Biology, Agriculture and Healthcare, volume 9, number 15, pages 37-46, ISSN 2224-3208, 2019. [DOI]
 
Evaluation of early maturing cowpea (Vigna unguiculata) germplasm for variation in phosphorus use efficiency and biological nitrogen fixation potential with indigenous rhizobial populations, Abaidoo, R., Dare, M. O.*, Killani, A. S. and Opoku, A.*, in: Journal of Agricultural Science, volume 155, number 1, pages 102-116, ISSN 0021-8596, 2017. [DOI]
 
Field validation of intraspecific variation in phosphorus use efficiency and nitrogen fixation by provenances of Gliricidia sepium grown in low P soils, Sanginga, N., Danso, S. K. A.*, Zapata, F. and Bowen, G. D., in: Applied Soil Ecology, volume 1, pages 127-138, ISSN 0929-1393, 1994.
 
Forms of phosphorus in some important agricultural soils of Nigeria, Uzu, F. O., Juo, A. S. R. and Fayemi, A.A.A., in: Soil Science, volume 120, number 3, pages 212-218, ISSN 0038-075X, 1975.
 
Generation mean analysis of phosphorus-use efficiency in freely nodulating soybean crosses grown in low-phosphorus soil, Uzokwe, V. N. E., Asafo-Adjei, B., Fawole, I.*, Abaidoo, R., Odeh, I., Ojo, D. K., Dashiell, K. and Sanginga, N., in: Plant Breeding, volume 136, number 2, pages 139-146, ISSN 0179-9541, 2017. [DOI]
 
Genotypic variation of soybean for phosphorus use efficiency and their contribution of N and P to subsequent maize crops in three ecological zones of West Africa, Abaidoo, R., Sanginga, N., Okogun, J., Kolawole, G., Diels, J . and Tossah, B.*, in: In Demand driven technologies for sustainable maize production in West and Central Africa, pages 194-224, WECAMAN; International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2007.
 
Groundnut response to ash, phosphorus, potassium, lime, and tillage in southern Cameroon, Wendt, J ., in: Biological Agriculture and Horticulture, volume 20, number 3, pages 187-199, ISSN 0144-8765, 2002.
 
Growth and yield responses of cowpea to inoculation and phosphorus fertilization in different environments, Boahen, S., Engoke, C., Chikoye, D. and Abaidoo, R., in: Frontiers in Plant Science, volume 8, number 646, pages 1-13, ISSN 1664-462X, 2017. [DOI]
 
Impact of residue characteristics on phosphorus availability in West African moist savanna soils, Nwoke, C., Vanlauwe, B., Diels, J ., Sanginga, P. and Osonubi, O.*, in: Biology and Fertility of Soils, volume 39, pages 422-428, 2004.
 
Influence of phosphorus application on growth and yield of soybean genotypes in the tropical savannas of northeast Nigeria, Kamara, A., Abaidoo, R., Kwari, J.* and Omoigui, L., in: Archives of Agronomy and Soil Science, volume 53, number 5, pages 539-552, 2007.
 
Inoculant, nitrogen and phosphorus improves photosynthesis and water-use efficiency in soybean production, Engoke, C., Wiredu, A., Omondi, J. O. and Boahen, S., in: Journal of Agricultural Science, pages 1-14, ISSN 0021-8596, 2021. [DOI]
 
Lime-Phosphorus-Zinc Interactions in Two Nigerian Ultisols, Friessen, D.K, Juo, A. S. R. and Miller, M. G., 1978.
 
Liming and lime-phosphorus-zinc interactions in two Nigerian Ultisols: I. Interactions in the soil, Friese, D. K., Miller, M. H. and Juo, A. S. R., in: Soil Science Society of American Journal, volume 44, number 6, pages 1221-1226, ISSN 0361-5995, 1980. [DOI]
 
Maize yield as affected by the interaction of fertilizer nitrogen and phosphorus in the Guinea savanna of Nigeria, Tofa, A., Kamara, A., Babaji, B. A.*, Aliyu, K. T., Ademulegun, T. and Bebeley, J. F., in: Heliyon, volume 8, number 11: e11587, pages 1-9, ISSN 2405-8440, 2022. [DOI]
 
Maize yield following phosphorus-fertilized soybean in the Nigerian Guinea savanna, Ogoke, I.*, Carsky, R., Togun, A.* and Dashiell, K., pages 205-213, WECAMAN; International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2001.
 
Managing phosphate rock to improve nutrient uptake, phosphorus use efficiency, and carrot yields, Mwangi, E.*, Ngamau, C.*, Wesonga, J. M.*, Karanja, E., Musyoka, M. W., Matheri, F., Fiaboe, K., Bautze, D. and Adamtey, N., in: Journal of Soil Science and Plant Nutrition, volume 20, pages 1350-1365, ISSN 0718-9508, 2020. [DOI]
 
Nitrogen and phosphorus uptake by maize as affected by particulate organic matter quality, soil characteristics, and land-use history for soils from the West African moist savanna zone, Vanlauwe, B., Aihou, K.*, Tossah, S., Aman, B. K., Diels, J ., Lyasse, O., Hauser, S., Sanginga, P. and Merckx, R ., in: Biology and Fertility of Soils, volume 30, pages 440-449, 2000.
 
Nodulation and growth response of Allocasuarina and Casuarina species to phosphorus fertilization, Sanginga, N., Danso, S. K. A.* and Bowen, G. D., in: Plant and Soil, volume 118, pages 125-132, 1989.
 
Obliteration of phosphorus deficiency in plants by microbial interceded approach, Dipta, B.*, Bhardwaj, S.*, Kaushal, M., Kirti, S.* and Sharma, R.*, in: Symbiosis, pages 1-14, ISSN 0334-5114, 2019. [DOI]
 
On-farm evaluation and determination of sources of variability of soybean response to Bradyrhizobium inoculation and phosphorus fertilizer in northern Ghana, Ulzen, J.*, Abaidoo, R., Ewusi-Mensah, N.* and Masso, C., in: Agriculture, Ecosystems and Environment, volume 267, pages 23-32, ISSN 0167-8809, 2018. [DOI]
 
Opportunities for better phosphorus use in agriculture, Masso, C., Zhang, F.*, Adhya, T. K.*, Blackwell, M. S. A., Macintosh, K. A., Johnes, P. J., Haygarth, P. M., Withers, P., Feng, G.*, Li, H.*, Zhang, C.*, Wu, J.*, Shen, J.*, Stutter, M., Cheng, L. and Brownlie, W., pages 113-154, chapter 4, UK Centre for Ecology and Hydrology, ISBN 978-1-906-69879-9, 2022. [DOI]
 
Organic acids in the rhizosphere and root characteristics of soybean (Glycine max) and cowpea (Vigna unguiculata) in relation to phosphorus uptake in poor savanna soils, Nwoke, C., Diels, J ., Abaidoo, R., Nziguheba, G. and Merckx, R ., in: African Journal of Biotechnology, volume 7, number 20, pages 3617-3624, ISSN 1684-5315, 2008.
 
Organic phosphorus dynamics in tropical agroecosystems, Nziguheba, G. and Buenemann, E., pages 243-268, CABI, 2005.
 
Performance of cowpea as influenced by native strain of rhizobia, lime and phosphorus in Samaru, Nigeria, Bello, S. K.*, Yusuf, A. A.* and Masso, C., in: Symbiosis, volume 75, number -:177, pages 167-176, ISSN 0334-5114, 2018. [DOI]
 
Performance of cowpea as influenced by native strain of rhizobia, lime and phosphorus in Samaru, Nigeria, Bello, S. K.*, Yusuf, A. A.*, Abdelgadir, A. H. and Masso, C., Abstract, p. 33, in the book of abstracts of the 17th AABNF Biennial Conference 17-21 October, Gaborone, Botswana, 2016.
 
Phenotyping cowpea for seedling root architecture reveals root phenes important for breeding phosphorus efficient varieties, Mohammed, S. B.*, Burridge, J. D., Ishiyaku, M. F.*, Boukar, O. and Lynch, J. P., in: Crop Science, pages 1-20, ISSN 0011-183X, 2021. [DOI]
 
Phenotyping for adaptation to drought and low-phosphorus soils in cowpea (Vigna unguiculata (L.) Walp.): proceedings/poster, Belko, N., Boukar, O., Fatokun, C. and Vadez, V., 2015.
 
Phosphorus and liming effects on early growth of selected plant species grown on an Ultisol, Kang, B., Ladipo, D. O. and Ofeimu, O., in: Communications in Soil Science and Plant Analysis, volume 26, number 9 and 10, pages 1659-1673, 1995.
 
Phosphorus and nitrogen fertilization of soybean in the Nigerian savanna, Kamara, A., Ekeleme, F.*, Omoigui, L.* and Ajeigbe, H., in: Experimental Agriculture, pages 1-10, ISSN 0014-4797, 2011. [DOI]
 
Phosphorus availability of phosphate rock incubated with plant residues with various chemical compositions, Tian, G. and Kolawole, G., in: Agroforestry Forum, volume 9, pages 40-42, 1999.
 
Phosphorus benefits from grain-legume crops to subsequent maize grown on acid soils of southern Cameroon, Jemo, M., Abaidoo, R., Nolte, C., Tchienkoua, M.*, Sanginga, P. and Horst, W. J., in: Plant and Soil, volume 284, number 1-2, pages 385-397, 2006.
 
Phosphorus effects on growth and yield of groundnut varieties in the tropical savannas of northeast Nigeria, Kamara, A., Ekeleme, F.*, Kwari, J.*, Omoigui, L.* and Chikoye, D., in: Journal of Tropical Agriculture, volume 49, number 1 and 2, pages 25-30, ISSN 0971-636X, 2011.
 
Phosphorus fractions in fallow systems of West Africa: effect of residue management, Kolawole, G., Tijani-Eniola, H. and Tian, G., in: Plant and Soil, volume 263, pages 113-120, 2004.
 
Phosphorus in smallholder farming systems of sub-Saharan Africa: implications for agricultural intensification, Nziguheba, G., Zingore, S., Kihara, J., Merckx, R ., Njoroge, S., Otinga, A.*, Vandamme, E. and Vanlauwe, B., in: Nutrient Cycling in Agroecosystems, volume 104, number 3, pages 321-340, ISSN 1385-1314, 2016. [DOI]
 
Phosphorus recovery from triple superphosphate by soyabean in the Guinea savanna of Nigeria, Ogoke, I.*, Togun, A.*, Carsky, R. and Dashiell, K., in: Tropical Science, volume 46, number 3, pages 129-133, ISSN 0041-3291, 2006.
 
Phosphorus requirement and nodulation of herbaceous and shrub legumes in low P soils of a Guinean Savanna in Nigeria, Sanginga, N., Okogun, J., Akobundu, I. and Kang, B., in: Applied Soil Ecology, volume 3, number 3, pages 247-255, ISSN 0929-1393, 1996.
 
Phosphorus response efficiency in cowpea genotypes, Olaleye, O.*, Fagbola, O.*, Abaidoo, R. and Ikeorah, N.*, in: Journal of Agricultural Science, volume 4, number 1, pages 81-90, ISSN 1916-9752, 2012. [DOI]
 
Phosphorus response of cowpea,Vigna unguiculata(L) Walp, Kang, B. and Nangju, D., in: Tropical Grain Legume Bulleting, volume 27, pages 11-16, 1983.
 
Phosphorus response of maize grown on alfisols of southern Nigeria, Kang, B. T. and Osiname, O.*, in: Agronomy Journal, volume 71, pages 873-877, ISSN 0002-1962, 1979. [DOI]
 
Phosphorus use efficiency and nitrogen balance of cowpea breeding lines in a low P soil of the derived savanna zone in West Africa, Sanginga, N., Lyasse, O. and Singh, B., in: Plant and Soil, volume 220, pages 119-128, ISSN 0032-079X, 2000. [DOI]
 
Physiological responses of cowpea (Vigna unguiculata L. Walp) varieties to Rhizobia inoculation, phosphorus application and sequential cropping system in Minna, Nigeria, Adediran, O. A.*, Federal University of Technology, 2019.
 
Potential of inoculant and phosphorus application on soybean production in Mozambique, Engoke, C. and Boahen, S., in: Universal Journal of Agricultural Research, volume 8, number 2, pages 46-57, ISSN 2332-2268, 2020. [DOI]
 
Preliminary report on evaluation of phosphorus sources in Westen Nigeria, Kang, B. T. and Juo, A. S. R., 1974.
 
Pyrophosphate as a source of phosphorus for Maize in some Acid Soils from Southern Nigeria, Uzo, F.O, Udo, E.* and Juo, A. S. R., in: Journal of Experimental Agriculture, in press, 1982.
 
Residual phosphorus effects and nitrogen x phosphorus interactions in soybean-maize rotations on a P-deficient Ferralsol, Vandamme, E., Pypers, P., Vanlauwe, B., Baijukya, F., Smolders, E. and Merckx, R ., in: Nutrient Cycling in Agroecosystems, volume 98, number 2, pages 187-201, ISSN 1385-1314, 2014. [DOI]
 
Response of common bean (Phaseolus vulgaris L.) to nitrogen, phosphorus and rhizobia inoculation across variable soils in Zimbabwe, Chekanai, V.*, Chikowo, R.* and Vanlauwe, B., in: Agriculture, Ecosystems and Environment, volume 266, pages 167-173, ISSN 0167-8809, 2018. [DOI]
 
Response of cowpea (Vigna unguiculata L.Walp) varieties to Bradyrhizobial strains (USDA 3384 and 3451) and phosphorus levels in the Sudan Savanna of Nigeria, Musa, M.*, Bayero University, 2017.
 
Response of cowpea genotypes to low soil phosphorus conditions in Africa, Adusei, G., Gaiser, T. and Ousmane, B., Abstract, p. 103 in the book of abstracts of the Tropentag 2015: management of land use systems for enhanced food security - conflicts, controversies and resolutions, in Humboldt-Universitat Berlin, Germany, September 16 - 18, 2015.
 
Response of grain legumes to phosphorus application in the guinea savanna agro-ecological zones of Ghana, Adjei-Nsiah, S., Alabi, B. U., Ahiakpa, J. K.* and Kanampiu, F., in: Agronomy Journal, volume 110, number 2, pages 1-8, ISSN 0002-1962, 2018. [DOI]
 
Response of maize (Zea mays) to phosphorus application on basaltic soils in northwestern Cameroon, Osiname, O. A., Meppe, F.* and Everett, L., in: Nutrient Cycling in Agroecosystems, volume 56, pages 209-217, ISSN 1385-1314, 2000.
 
Response of soybean (Glycine max L.) genotypes to varying levels of phosphorus for yield and related traits under acid soils of western Ethiopia, Abebe, A. T., Githiri, M.*, Derera, J.* and Debele, T.*, in: Ethiopian Journal of Applied Science and Technology, volume 9, number 2, pages 1-16, 2018.
 
Soybean (Glycine max L. Merrill) responds to phosphorus application and rhizobium inoculation on Acrisols of the semi-deciduous forest agro-ecological zone of Ghana, Adjei-Nsiah, S., Martei, D.*, Yakubu, S. A.* and Ulzen, J.*, in: PeerJ, pages 1-16, ISSN 2167-8359, 2022. [DOI]
 
Soybean phosphorus-use efficiency in the moist Savanna of West Africa, Ogoke, I.*, Togun, A.* and Dashiell, K., in: Journal of Sustainable Agriculture, volume 28, number 1, pages 5-18, ISSN 1044-0046, 2006. [DOI]
 
The distribution of phosphorus fractions and desorption characteristics of some soils in the moist savanna zone of West Africa, Nwoke, C., Vanlauwe, B., Diels, J ., Sanginga, P. and Osonubi, O.*, in: Nutrient Cycling in Agroecosystems, volume 69, pages 127-141, 2004.
 
The phosphate inhibition paradigm: host and fungal genotypes determine arbuscular mycorrhizal fungal colonization and responsiveness to inoculation in cassava with increasing phosphorus supply, Venegas, R. A. P., Lee, S. J., Thuita, M., Mlay, P. D.*, Masso, C., Vanlauwe, B., Rodriguez, A.* and Sanders, I. R., in: Frontiers in Plant Science, volume 12, number : 693037, pages 1-11, ISSN 1664-462X, 2021. [DOI]
 
Towards our phosphorus future, Brownlie, W., Spears, B. M., Heal, K. V., Reay, D. S., Benton, T. G., Cordell, D., Heathwaite, A. L., Hermann, L., Johnes, P. J., Masso, C., Mcdowell, R., McGrath, J. W. and Metson, G. S., pages 339-369, chapter 9, UK Centre for Ecology and Hydrology, ISBN 978-1-906-69879-9, 2022. [DOI]
 
Utilization of phosphorus from different sources by genotypes of promiscuous soybean and cowpea in a low-phosphorus savanna soil, Nwoke, C., Diels, J ., Abaidoo, R. and Sanginga, N., in: African Journal of Agricultural Research, volume 2, number 4, pages 150-158, 2007.
 
Phosphorus recovery from triple superphosphate by soyabean in the Guinea savanna of Nigeria, Ogoke, I.*, Togun, A.*, Carsky, R. and Dashiell, K., in: Tropical Science, volume 46, number 3, pages 129-133, ISSN 0041-3291, 2006.
 
Keywords:Phosphorus; Soyabean; Guinea savanna; Apparent fertilizer P recovery; Residual P

Influence of phosphorus application on growth and yield of soybean genotypes in the tropical savannas of northeast Nigeria, Kamara, A., Abaidoo, R., Kwari, J.* and Omoigui, L., in: Archives of Agronomy and Soil Science, volume 53, number 5, pages 539-552, 2007.
 
Abstract:
The cultivation of soybean is increasing in the savannas of Nigeria due to its widespread use in the food and feed industry. Production is, however, constrained by low soil phosphorus (P) levels in northeast Nigeria. This study evaluated four soybean varieties for their response to three rates of P in two agro-ecozones in 2004 and 2005. Experimental design was a split-plot arrangement of treatments with three replications. The main plots were assigned the P treatments and subplots were soybean cultivars randomised within the main plots. The studies found that soybean responds to P application but differences between 20 and 40 kg P/ha were not significant, despite low test P levels. This may be due to limitations in other nutrients. More studies are needed to determine the synergistic effect of P and other nutrients on soybean growth and yield. Soybean growth and seed yield were lower in 2004 than in 2005 because trials were established comparatively late in 2004 and crops were therefore affected by late season moisture stress. There is, therefore, a need to establish the appropriate time for planting soybean in these zones. Late maturing varieties produced higher yields than early maturing varieties in 2005 probably due to early planting which allowed full use of the growing season.