Document Type: Original Article


1 Department of Horticultural Science, Special Plants Regional Research, Faculty of Agriculture, University of Birjand, Iran

2 Department of Horticultural Science, Faculty of Agriculture, University of Birjand, Iran


Purpose: Vegetables are important sources of carbohydrates, proteins, vitamins and minerals. Bell peppers, the fruit of Capsicum annuum L. is one of the most important commercial crops in the world. This study was conducted to determine the effects of nitrogen (N) doses on growth and yield of sweet pepper under field conditions. Research Method: Treatments consisted of 0, 50, 100 and 150 kg N ha−1. Plant height, Leaf chlorophyll index, flower number, yield, fruit seed number, 1000 seed weight and vitamin C were assessed at immature and mature. Findings: Nitrogen rate increasing affected significantly plant vegetative growth (plant height, lateral stem number, and leaf chlorophyll). The highest length and number of lateral stem and leaf number were obtained in plants treated with100 kg N ha-1.The results indicated that reproductive factors (weight and volume of fruit, plant yield, and 1000 seed weight) were influenced by nitrogen fertilizer. It was observed that fertilization with 150 kg N ha-1 resulted to the highest fruit weight and fruit yield. Although there were no significant differences in vitamin C content among treated plants with different nitrogen levels at a mature stage, it was shown significant differences between treated plants and control. Research limitations: If we could use several sources of nitrogen fertilizer such as ammonium nitrate and ammonium sulphate, then it was compared themو it seemed that we got better results about sweet pepper. Originality/value: Results showed that nitrogen fertilization has a strong impact on the vegetative, flowering and reproductive growth of pepper plants.


Main Subjects

Akanbi, W.B., Togun, A.O., Olaniran, O.A., Akinfasoye, J.O., & Tairu, F.M. (2007). Physico-chemical properties of eggplant (Solanum melongena L.) fruit in response to nitrogen fertilizer and fruit size. Agriculture Journal, 2(1), 140-148.

Ali, A.M., & Kelly, W.C. (1992). The effects of interfruit competition on the size of sweet pepper (Capsicum annuum L.). Fruits Science Horticulture, 52, 69-76.

Anita, B., Agnieszka Nawirska, A., Alicja, K., & Sokol-Letowska, A. (2009). The effect of nitrogen fertilization methods on yield and chemical composition of pumpkin (Cucurbita maxima) fruits before and after storage. Vegetable Crops Research Bulletin, 70, 203-211.

AOAC (2000). Official Method of Analysis (17thed.). Gaithersburg, MD, USA: Association of Official Analytical Chemists (No. 967.21 Ascorbic acid in vitamin preparation and juices.

Aroiee, H., & Omidbaigi, R. (2004). Effects of nitrogen fertilizer on productivity of medicinal pumpkin. Acta Horticulture, 629, 415-419.

Aujla, M.S., Thind, H.S., & Buttar, G.S. (2007). Fruit yield and water use efficiency of eggplant (Solanum melongema L.) as influenced by different quantities of nitrogen and water applied through drip and furrow irrigation. Scientia Horticulture, 112, 142–148.

Ayodele, O.J., Alabi, E.O., & Aluko, M. (2015). Nitrogen fertilizer effects on growth, yield and chemical composition of hot pepper (Rodo). International Journal of Agriculture and Crop Sciences. 8(5), 666-673.

Ayodele, V.I. (2002). Influence of nitrogen fertilisation on yield of Amaranthus species. Acta Horticulture, 571, 89-95.

Bar-Tal, A., Aloni, B., Karin, L., & Rosenberg, R. (2001). Nitrogen nutrition of greenhouse pepper: Effects of nitrogen concentration and NO3:NH4 ratio on growth, transpiration, and nutrient uptake. Horticulture Science, 36, 1525-1529.

Basela, O., & Mahadeen, A. (2008). Effect of fertilizers on growth, yield, yield components, quality and certain nutrient contents in broccoli (Brassica oleracea). International Journal of Agricultural and Biology, 10, 627–632.

Boroujerdnia, M., & Ansari, N.A. (2007). Effect of different levels of nitrogen fertilizer and cultivars on growth, yield and yield components of romaine lettuce (Lactuca sativa L.). Middle Eastern and Russian Journal of Plant Science and Biotechnology, 1(2), 47-53.

Bosland, P.W., & Vostava, E.J. (2000). Peppers: Vegetable and Spice Capsicum. CABI publishing, New York, USA.

Bowen, P., & Frey, B. (2002). Response of plasticultared bell pepper to staking, irrigation frequency and fertigated nitrogen rate. Horticultural Science, 37, 95-100.

Devi, H.H., Maity, T.K., Paria, N.C., & Thapa, U. (2002). Response of brinjal to different sources of nitrogen. Journal of Vegetable Science, 29(1), 45-47.

Fernández-Luqueño, F., Reyes-Varela, V., Martínez-Suárez, C., Salomón-Hernández, G., Yáñez-Meneses, J., Ceballos-Ramírez, J.M., & Dendooven, L. (2010). Effect of different nitrogen sources on plant characteristics and yield of common bean (Phaseolus vulgaris L.). Bioresource Technology, 101, 396-403.

Geti, T., Song, S., Chi, M., Huang, D., & Iwasaki, K. (2008). Effects of nitrogen forms on carbon and nitrogen accumulation in tomato seedling.  Agricultural Sciences in China, 7(11), 1308-1317.

Gulser, F. (2005). Effect of ammonium sulphate and urea on NO3- and NO2- accumulation nutrient contents and yield criteria in spinach. Scientia Horticulturae, 106, 330-340.

Guohua, X., Shmuel, W., & Uzi, K. (2001). Effect of varying nitrogen from and concentration during growing season on sweet pepper flowering and fruit yield. Journal of Plant Nutrition, 24, 1099-1116.

Jilani, M.S., Afzal, M.F., & Waseem, K. (2008). Effect of different nitrogen levels on growth and yield of Brinjal (Solanum melongena L). Journal of Agriculture Research, 46(3), 245-251.

Khattak, M. N., Muhammad, I., & Nisar, N. (2001). Effect of different levels of nitrogen on the growth and yield of different cultivars of eggplant under the agro-climatic conditions of Peshawar. Sarhad Journal of Agriculture, 17(3), 339-346.

Law-Ogbomo, K., & Egharevba, E. (2009). Effects of planting density and NPK fertilizer application on yield and yield components of tomato (Lecopersicum esculentum Mill) in forest Location. World Journal of Agricultural Sciences, 5(2), 152-158.

Lorenzoni, M.Z., Rezende, R., De Souza, A.H.C., Seron, C.D.C., Hachmann, T.L. (2016). Response of bell pepper crop fertigated with nitrogen and potassium doses in protected environment. Agrotechnology, 5, 1-5.

Magdalena, V.C. (2003). Salinity and nitrogen rate effects of the growth and yield of chilli pepper plants. Journal of Soil Science, 67, 1781-1789.

Mozafar, A. (1993). Nitrogen fertilization and the amount of vitamins in plant. Journal of Plant Nutrition, 16, 2479-2506.

Mylavarapu, R.S., & Kennelley, D.E. (2002). UF/IFAS Extension Soil Testing Laboratory (ESTL): Analytical Procedures and Training Manual. Institute of Food and Agricultural Sciences, University of Florida Gainesville, USA, 28.

Olaniyi, J.O. (2008). Growth and seed yield response of Egusi melon to nitrogen and phosphorus fertilizers application. American-Eurasian Journal of Sustainable Agriculture, 2(3), 255-260.

Pervez, M.A., Ayub, C.M., Bashart, A., Naved, A.V., & Nasir, M. (2004). Effect of nitrogen levels and spacing on growth and yield of radish (Raphanus sativus L.). International Journal of Agricultural and Biology, 6, 504-506.

Remison, S.U. (1997). Basic Principles of Crop Physiology. Sadoh Press. Benin City.

Roe, E.N., & Cornforth, C.G. (2000). Effect of dairy lot scraping and composted dairy manure on growth, yield and profit potential of double-cropped vegetables. Compost Science and Utilization, 8, 320-327.

Satpal, M., & Saimbhi, S. (2003). Effect of varying levels of nitrogen and phosphorus on earliness and yield of brinjal hybrids. Research on Crops, 4(2), 217-222.

Shrivastava A.K. (1996). Effect of fertilizer levels and spacings on flowering, fruit set and yield of sweet pepper (Capsicum annuum var. grossum L.) cv. Hybrid Bharat. Advances in Plant Sciences, 9, 171-175.

Solvadore, J., Locascio, G., & Hochmuth, J. (1997). Nitrogen and potassium application scheduling effects on drip-irrigated tomato yield and leaf tissue analysis. Horticultural Science, 32(2), 230-235.

Tabatabaie, S.J., & Malakouti, M.J. (1997). Studies on the effect of the N, P, and K fertilizers on the potato yield and nitrate accumulation in potato tuber. Iranian Journal of Soil and Water Research, 11, 25-30.

Takebe, M., Ishihara, T., Matsuna, K., Fojimoto, J., & Yoneyama, T. (1995). Effect of nitrogen application on the content sugars, ascorbic acid, nitrate and oxalic acid in spinach (Spinacia oleracea L.) and kamatsuna (Brassica compestris L.). Japanese Journal of Soil Science and Plant Nutrition, 66, 238-246.

Tei, F., Benincasa, P., & Guiducci, M. (2000). Effect of nitrogen availability on growth and nitrogen uptake in lettuce. Acta Horticulture, 533, 385-392.

Togun, A. O., Akanbi, W. B., & Dris, R. (2003). Influence of compost and nitrogen fertilizer on growth, nutrient uptake and fruit yield of tomato (Lycopersicum esculentum). Journal of Crop Research, 98, 40–56.

Tumbare, A.d., & Niikam, D.R. (2004). Effect of planting and fertigation on growth and yield of green chilli (Capsicum annuum). Indian Journal of Agricultural Sciences, 74(5), 242-245.