Determination of optimum level of NPK for cultivation of sweetpotato in Samoa

Taniela K Siose, Md Abdul Kader

Abstract


Establishment of a sound fertiliser dose is necessary for achieving higher yield, soil fertility protection and environmental sustainability. Currently, there is no data pertaining to the optimum fertiliser requirement for sweetpotato under Samoan situation. To achieve this, an experiment was conducted to determine the optimum NPK levels for three sweetpotato cultivars under screen-house and field conditions in Samoa. The experiment includes four levels of NPK in kg/ha equivalent (control, 30:30:30, 60:60:60, and 90:90:90) and three improved sweetpotato cultivars (IB/PH/03, IB/PR/12, and IB/PR/13). Results revealed that each cultivar exhibited remarkably varied responses to NPK levels. Yield of IB/PH/03 increased consistently with increasing NPK levels indicating that, the applied NPK levels was insufficient to determine optimum NPK level. Cultivar IB/PR/13 followed a typical crop response curve, however, IB/PR/12 failed to produce significantly higher yield with increased level of NPK. Based on a quadratic model, the putative optimum NPK level for IB/PR/13 and IB/PR/12 was determined - 49-49-49 and 42-42-42 kg/ha respectively, however, the most profitable NPK levels were 30-30-30 and 18-18-18 kg/ha, respectively. Although the profitable NPK level was the highest level for IB/PH/03, it has not been possible to determine the optimum NPK level correctly. Thus, further studies are suggested to test higher NPK dose for IB/PH/03 and other varieties of sweetpotato under wider soil conditions in order to verify the result.  This study would be a good basis for future study in a wide range of sols in Samoa and sweetpotato cultivars to achieve conclusive findings


Keywords


Crop response curve, Fertiliser, Nutrient utilisation, Sweetpotato, Samoa

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References


AGBEDE T.M. 2010. Tillage and fertiliser effects on some soil properties, leaf nutrient concentrations, growth and sweetpotato yield on an Alfisol in southwestern Nigeria. Soil Tillage Research, 110(1): 25-32. GS SEARCH

ASGHAR M., DAVIDSON JR.T.J. & MORRISON R.J. 1988. Soil classification and fertility in the South Pacific. University of the South Pacific, Apia, Western Samoa.

ASORO, F.G. & CARPENA, C. 2005. Variability analysis of improved sweet potatoes [Ipomoea batatas (L.) Lam] varieties in the Philippines. Philippine Agricultural Scientist, 88(4):408-417.

BLAKEMORE L.C., SEARLE P.L. & DALY B.K. 1981. Methods for chemical analysis of soils. New Zealand Soil Bureau Scientific Report 10A.

BLAKEMORE L.C., SEARLE P.L. & DALY, B.K. 1987. Methods of Chemical Analysis of Soils. New Zealand Soil Bureau Scientific Report 80. pp: 103.

BOURKE R.M. 1985. Sweetpotato (Ipomoea batatas) production and research in Papua New Guinea. Papua New Guinea Journal of Agriculture Forestry and Fisheries, 33: 89-108.

BREMNER, J. M. 1996. Nitrogen-Total. In Methods of Soil Analysis. Part 3, Chemical Methods; Sparks, D. L., Ed.; Soil Science Society of America, American Society of Agronomy: Madison, WI, pp 1085–1121.

CHAND K. 2002. Samoa. http://www.apipnm.org/swlwpnr/reports/y_pa/z_ws/ws.htm Viewed on 23rd June, 2020.

CHIPUNGAHELO G.S., NGEREZA A., KAWAMALA P., KWILEKA T., 2010 - Effects of light on sweetpotato (Ipomoea batatas L.), cowpea (Vigna unguiculata L.) and pineapple (Ananas comosus L.). Journal of Life Science, 4(6)(31): 39-45.

DALY B.K., MANU V.T. & HALAVATAU S.M. 1984. Soil and plant analysis methods for use at the Agricultural Research Station, Vaini, Tonga. New Zealand Soil Bureau Laboratory Report AN2.

DUMBUYA G., SARKODIE-ADDO J., DARAMY M.A. & JALLOH, M. 2016. Growth and yield of response sweetpotato to different tillage methods and phosphorus fertiliser rates in Ghana. Journal of Experimental Biology and Agricultural Sciences, 4(5): 475-483.

GWEYI-ONYANGO J.P., SAKHA M.A. & JEFWA J. 2021. Agricultural Interventions to Enhance Climate Change Adaptation of Underutilized Root and Tuber Crops. In: Leal Filho W., Oguge N., Ayal D., Adeleke L., da Silva I. (eds) African Handbook of Climate Change Adaptation. Springer, Cham. https://doi.org/10.1007/978-3-030-45106-6_40

HALIRU M., AUDU M., LUKMAN S.A., SAUWA M.M., ALIYU I. & HAYATU N.G. 2015. Effect of cow dung, NPK and their combinations on soil properties and performance of sweetpotato (Ipomoea batatas L.) in Sudan Savanna, Nigeria. American Journal of Experimental Agriculture, 6(3): 189-195.

HARTEMINK A.E., POLOMA S. & O’SULLIVAN J.N. 2001. Integrated nutrient management research with sweetpotato at Hobu. pp. 698-711. - In: BOURKE R.M., M.G. Allen and J.G. Salisbury (eds.) Food Security in Papua New Guinea. ACIAR Proceedings no. 99, Canberra.

HASSAN M.A., EL-SEIFI S.K., OMAR E.A. & SAIF EI-DEAN U. M. 2005. Effect of mineral and bio-phosphate fertilization and foliar application of some micronutrients on growth, yield and quality of sweet potato (Ipomoea batata, L). 1- Vegetative growth, yield and tuber characteristics. Journal of Agricultural Science Mansoura University, 30: 6149-6166.

JOHNSTON M. & ONWUEME I.C. 1998. Effect of shade on photosynthetic pigments in the tropical root crops: yam, taro, tannia, cassava and sweetpotato. Experimental Agriculture, 34: 301-312.

KAREEM I. 2013a. Effects of phosphorus fertiliser treatments on vegetative growth, tuberous yield and phosphorus uptake of sweetpotato (Ipomoea batatas). African Journal of Agricultural Research, 8(22): 2681-2684.

KAREEM I. 2013b. Fertiliser treatment effects on yield and quality parameters of sweetpotato (Ipomoea batatas). Research Journal of Chemical and Environmental Sciences, 1(3): 40-49.

LESE, V., HOLLAND, E., WAIRIU, M., HAVEA, R., PATOLO, S., NISHI, N., HOPONOA, T., BOURKE, R.M., DEAN,A., & WAQAINABETE, L. 2018. Facing Food Security Risks: The Rise and Rise of Sweet Potato in the Pacific Islands. Global Food Security, 18, 48-56. https://doi.org/10.1016/j.gfs.2018.07.004

MARSCHNER H., 1995. Mineral Nutrition of Higher Plants. 2nd Edn. Academic Press, Harcourt Brace and Company Publishers. London. pp. 864.

MOHANTY A.K., SETHI K., SAMAL S., NASKAR S. K., & NEDUNCHEZHIYAN M. 2005. Relationship of optimum stage of harvest with weevil incidence in sweetpotato under different agro-climatic conditions of Orissa. Orissa Journal of Horticulture, 33 (1): 43-45.

MOTSA, N.M., MODI, A.T. & MABHAUDHI, T. 2015. Sweetpotato (Ipomoea batatas L.) as drought tolerant and food security crop. South African Journal of Science, 111(11/12):8. https://doi.org/10.17159/sajs.2015/20140252

MUKHOPADHYAY S. K., SEN H. & HANA, P.K. 1990. Effect of planting materials on growth and yield of sweetpotato. Journal of Root Crops, 16(2): 119-122.

MUKHTAR A.A., TANIMU B., ARUNAH U.L. & BABAJI B. A. 2010. Evaluation of the agronomic characteristics of sweetpotato cultivars grown at varying levels of organic and inorganic fertiliser. Journal of Agricultural Science, 6(4): 370-373.

NAIR G.M. & NAIR V.M. 1995. Influence of irrigation and fertilisers on the growth attributes of sweetpotato. Journal of Root Crops, 21: 45-49.

NAIR G.M., NAIR V.M. & SREEDHARAN C. 1996. Response of sweetpotato to phasic stress irrigation in summer rice fallows. Journal of Root Crops, 22(1): 45-49.

NO AUTHOR (NA), 1998. Potassium interactions with other nutrients. Better Crops, 82: 12-13.

NORMAN M.J.T., PEARSON C.J. & SEARLE P.G.E. 1995. Sweetpotato (Ipomoea batatas). The Ecology of Tropical Food Crops 2nd Edn. pp. 291-304. Cambridge University Press. http://dx.doi.org/10.1017/CB09791172479.017

O’SULLIVAN J.N., ASHER C.J. & BLAMEY F. P. C.. 1997. Nutrient disorders of sweetpotato. ACIAR Monograph No 48. Canberra, Australia, pp. 136.

ONWUDIKE S.U. 2010. Effectiveness of cow dung and mineral fertiliser on soil properties, nutrient uptake and yield of sweetpotato in southeastern Nigeria. Asian Journal of Agricultural Research, 4(3): 148-154. DOI: 10.3923/ajar.2010.148.154

PIERRE-LOUIS R.C., KADER, M.A., DESAI, M.N., JHON, E.H. 2021. Potentiality of Vermicomposting in the South Pacific Island Countries: a review. Agriculture, 11(9), 876. https://doi.org/10.3390/agriculture11090876

PUREKAR P.N., SINGH R.R. & DESHMUKH R.D. 1992. Plant Physiology and Ecology. 2nd Edn. S Chand, and Company, New Delhi, India.

SIOSE T.K., KADER M.A. & TULIN A.B. 2017. Determination of limiting nutrient to sweetpotato growth on Samoa Oxisol using a nutrient omission technique. Annals of Tropical Research, 19(1): 105-119. https://doi.org/10.32945/atr3917.2017

SIOSE, T.K, GUINTO, D.F. & KADER, M. A. 2018. Organic amendments increased sweetpotato (Ipomoea batata L.) yield in calcareous sandy soil of Samoa. South Pacific Journal of Natural and Applied Sciences. 36(1): 36-45. https://doi.org/10.1071/SP18005

TREHAN S.P., PANDEY S.K. & BANSAL S.K. 2009. Potassium nutrition of potato crops - The Indian Scenario (pp. 2-9). No. 19.

WALKER R.L., BURN I.G. & MOORBY J. 2001. Responses of plant growth to nitrogen supply: a comparison of relative addition and N interruption treatments. Journal of Experimental Botany, 52(355): 309-317.

WEIL R.R. & BRADY N.C. 2017. The nature and Properties of Soils. 15th Edn. Upper Saddle River, NJ: Prentice Hall.


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