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Alloway, B.J. (2008). Zinc in soils and crop nutrition (2nd.ed.). Paris, France: International Zinc Association.

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Fageria, N.K. (2012). Role of soil organic matter in maintaining sustainability of cropping                        systems. Communications in Soil Science and Plant Analysis, 43(16), 2063-2113.

 

Miller, S.A and Mazurak, A.P. (1958). Relationships of particles and pore size to the growth of sunflowers. Soil Science of American Journal, 4(22), 275-278.

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OMAFRA staff. (2009). Agronomy guide for field crops. Retrieved from:  http://www.omafra.gov.on.ca/english/crops/pub811/7other.htm#sunflower

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The Cottage Country Gardener. (2016). Retrieved from: http://www.cottagegardener.com/

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World Weather. (2016). Kathmandu monthly climate average, Nepal. Retrieved from:                              https://www.worldweatheronline.com/v2/weather-kathmandu-weather-averages/np.aspx

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Picture reference: WIX image

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