[1] Abdirazak A,Bereket T. Pre-Scaling up of Improved Maize Varieties in Essera and Boloso Sore Woreda of Southern Nation Nationalities and Peoples Regional State, Ethiopia. Agri Res & Tech :Open Access J. 2018; 17(2): 556019. DOI: 10.19080/ARTOAJ.2018.17.556019.
[2] T. Abate, B. Shiferaw, A. Menkir et al., “Factors that transformed maize productivity in Ethiopia,” Food Security, vol. 7, no. 5, pp. 965–981, 2015.
[3] CSA. (2021). Ethiopian Agricultural Sample Enumeration, 2021/22 (2014 E.C). Central Statistics Authority, Addis Ababa, Ethiopia.
[4] Sirkanth M, Mohamed AM, Muthukrihan P (2009). Influence of plant density and fertilizer on yield attributes yield and grain uality of hybrid maize. Madras Agric. J. 96(1-6):139-143.
[5] Bould, C., E.J. Hewitt, and P. Needham, 1984. Diagnosis of Mineral Disorders in Plants. Vol. 1: Principles. Chemical Publishing, New York.
[6] Schrader LE (1984) Functions and transformation of nitrogen in higher plants. In: Hauck RD (Ed.) Nitrogen in Crop Production. pp. 55-60
[7] Tolessa D, Tesfa B, Wakene N, Tenaw W, Minale L, Tewodros M, Birtukan M , Waga M (2002). A review of fertilizer management research on maize in Ethiopia. Enhancing the Contribution of Maize to Food Security in Ethiopia:
[8] Tilahun Tadesse1* Alemayehu Assefa2 Minale Liben1 and Zelalem Tadesse1. (2013). Effects of nitrogen split-application on productivity, nitrogen use efficiency and economic benefits of maize production in Ethiopia
[9] Batjes, N. H., (1995). Aglobal data set of soil pH properties. Technical Paper 27, International Soil Reference and Information Centre (ISRIC), Wageningen.
[10] Olsen, S. R., Cole, C. V., Watanabe, F. S. and Dean, L. A. (1954). Estimation of available phosphorus in soilby extraction with sodium bicarbonate. USDA circular 939. 1-19p.
[11] Berhanu, D., (1980). A survey of studies conducted about soil resources appraisal and evaluation for rural development in Ethiopia, Addis Ababa. 70p.
[12] Tekalign M, and Haque I (1991). Phosphorus status of some Ethiopian soils, II. Forms and distribution of inorganic phosphates and their relation to available phosphorus. Tropical Agriculture, 68: 2-8.
[13] Donald CM (1962). "In search of yield." Journal of Australian Institute of Agricultural Science, vol. 28, pp. 171-178.
[14] CIMMYT (1988). From agronomic data to farmer recomendations: An economic training manual. Revised Edition. Mexico, D.F.
[15] Getachew, A., and Taye, B., (2005). On-farm integrated soil fertility management in wheat on nitisols of central Ethiopian highlands. Ethiopian Journal of Natural Resources, 7: 141-155.
[16] Shah H, Sharif M, Majid A, Hayat U, Munawar A. 2009. From experimental data to farmer recommendation: an economic analysis of onfarm trial of UMMB feed for milking animals in rain-fed Pothwar, Pakistan. Livestock Research for Rural Development, 21(117)
[17] Adhikari, P., Baral, B.R., & Shrestha, J. (2016). Maize response to time of
[18] nitrogen application and planting seasons. Journal of Maize Research and Development,2(1):83-93, doi: http://dx.doi.org/10.3126/jmrd.v2i1.16218
[19] Schrader LE (1984) Functions and transformation of nitrogen in higher plants. In: Hauck RD (Ed.) Nitrogen in Crop Production. pp. 55-60
[20] Brady, N., Weil R. R., (2008). Nature and Properties of Soils (14th edn.). Prentice Hall, Upper Saddle River. 992p.
[21] Abebe Z, Feyisa H. Effects of nitrogen rates and time of application on yield of maize: rainfall variability influenced time of N application. Int J Agron 2017; 2017: 1545280.CrossRef in wheat. J Agron 2006; 5(2): 251-6.
[22] Gehl RJ, Schmidt JP, Maddux LD, Gordon WB (2005). Corn yield response to nitrogen rate and timing in sandyirrigated soils. Agron. J.(97). Pp. 1230-1238
[23] Jamal Z, Hamayun M, Ahmad N, Chaudhary MF. Effects of soil and foliar application of different concentrations of NPK and foliar application of (NH4)2 SO4 on different yield parameters in wheat. J Agron 2006; 5(2): 251-6.
[24] Haile D, Nigussie D, Ayana A. Nitrogen use efficiency of bread wheat: effects of nitrogen rate and time of application. J Soil Sci Plant Nutr 2012; 12(3): 389-409
[25] Binder DL, Sander DH, Walters DT. Maize response to time of nitrogen application as affected by level of nitrogen deficiency. Agron. J. 2000; 92: 1228–1236. ttps://doi.org/10.2134/agronj2000.9261228x
[26] Thomison PR, Geyer AB, Bishop BL, Young JR, Lentz E (2004). Nitrogen fertility effects on grain yield, protein, and oil of corn hybrids with enhanced grain quality traits. Plant Management Network. Accepted for publication 15 October 2004. Published 24 November 2004
[27] Diekow J, Ceretta CA, Pavinato PE. Possible to anticipate the nitrogen dubbing of corn in the no-tillage system? In: South-brazilian soil science meeting 2. Santa Maria, DS/UFSM 1998; pp. 163-6.
[28] Megersa Debele, Tolera Abera and Tedesse. 2020. Debele Effect of Nitrogen Fertilizer Rates and Time of Applications on Phenology, Growth, Yield and Yield Components of Maize (Zea mays L.) Varieties at Bako, Western Oromia, Ethiopia
[29] Keyro Assefa* and Zenebe Mekonnen .2019. Effect of level and time of nitrogen fertilizer application on growth, yield and yield components of maize (Zea mays L.) at Arba Minch, Southern Ethiopia.
)
