Interaction of white mulch and nitrogen fertilization timing in the late season on flowering and yield components of strawberry (Fragaria × ananassa Duch.) in the following spring

Document Type : Full Paper



Effects of nitrogen fertilization timing close to the beginning of short-day period and white mulch on flowering and yield components have been studied in ‘Paros’ and ‘Queen elisa’ strawberry cultivars. Split plot experiment in a randomized complete block design with eight treatments (two mulch treatments × N fertilization during four different times from last week of August to third week of September) and three replications were used. Total soluble carbohydrates and total soluble proteins of leaves were measured in October. Yield components of both cultivars were evaluated during next spring. Soluble carbohydrates and soluble proteins were increased in plants subjected to nitrogen in the second and the third week of September as well as mulch in both cultivars. This was accompanied by an increase in inflorescence, flower and fruit number per plant in next spring. The greatest flowering enhancement, increased number of flowering and number of inflorescences per plant occurred when N fertilization started second and third week of September compared with the last week of August. General results showed that flower and fruit number per plant were higher in ‘Paros’ compared to ‘Queen elisa’, but average of fruit weight and yield were higher in ‘Queen elisa’ compared to ‘Paros’. These results suggest that application of nitrogen in the second and third week of September, along with the use of mulch can increase strawberry fruit production.


Main Subjects

  1. Blatt, C.R. (1984). Irrigation, mulch, and double rows planting related to fruit size and yield of `Bounty' strawberry. HortScience, 19, 826-827.
  2. Bradford, M.M. (1979). A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Journal of Analytical Biochemistry, 72, 248-254.
  3. Eshghi, S., Tafazoli, E., Dokhani, S., Rahemi, M. & Emam, Y. (2007). Changes in carbohydrate contents in shoot tips, leaves and roots of strawberry (Fragaria× ananassa Duch.) during flower-bud differentiation. Scientia Horticulturae, 113(3), 255-260.
  4. Hancock, J.F. (1999). Strawberries. Department of horticulture, Michigan state university, USA. CABI publishing. pp 257.
  5. Hytönen, T., Elomaa, P., Moritz, T., & Junttila, O. (2009). Gibberellin mediates daylength-controlled differentiation of vegetative meristems in strawberry (Fragaria× ananassa Duch). BMC Plant Biology, 9(1), 1.
  6. 6.       Ganjehi, B. & Golchin, A. (2011). The effect of different levels of N, K and Mg on yield and growth indices of strawberry in hydroponic culture.Journal of Science and Technology of Greenhouse Culture, 2(7), 71-80.
  7. Ghaderi, N. & Talaie, A.R. (2008). Influence of manure and urea on yield and some other fruit characteristics in strawberry cv. Kurdistan. Iranian Journal of Horticultural Sciences, 39(1), 99-107.
  8. Khochert, G. (1987). Carbohydrate determination by phenol-solphoric acid methods. In the handbook of physiological methods. J. A. Hellebust and J. S. Garigie (Eds). (pp. 96-97) Cambridge University press.
  9. PressIto, A., Hayama, H. & Kashimura, Y. (2004). Possible roles of sugar concentration and its metabolism in the regulation of flower bud formation in Japanese pear (Pyrus pyrifolia). Acta Horticulturae, 363, 365-373.
  10. Kumar, S. & Dey, P. (2011). Effects of different mulches and irrigation methods on root growth, nutrient uptake, water-use efficiency and yield of strawberry. Scientia Horticulturae, 127, 318-324.
  11. Larson, K. D., Koike, S. T. & Zalom, F. G. (2006). Polyethylene Mulch, Deficit Irrigation, Overhead Sprinkling and Strawberry Fruit Bronzing. Acta Horticulturae, 708, 51-58.
  12. Lieten, F. (2002). The effect of nutrition prior to and during flower differentiation on phyllody and plant performance of short day strawberry elsanta. Acta Horticulturae, 567, 345-348. 
  13. Moor, U., Karp, K. & Poldma, P. (2004). Effect of mulching and fertilization on the quality of strawberries. Agricultural Food Science, 13 (3), 256-267.
  14. Ngouajio, M., Wanga, G. & Goldy, R. (2007). Withholding of drip irrigation between transplanting and flowering increases the yield of field-grown tomato under plastic mulch. Agricultural Water Management, 87, 285-291.
  15. Opstad, N. & Sønsteby, A. (2008). Flowering and fruit development in strawberry in a field experiment with two fertilizer strategies. Acta Agriculture Scandinavia, Section B: Soil Plant Science, 58, 297-304.
  16. Ranjbar, R., Eshghi, S. & Rostami, M. (2011). Effect of foliar application of nickel sulfate and urea on reproductive growth and quantitative and qualitative characteristics of strawberry fruit (Fragaria×ananassa Duch. cv. Pajaro). Journal of Greenhouse Culture Science and Technology, 7, 41-48. (in Farsi)
  17. Sharma, R.R. & Sharma, V.P. (2003). Mulch influences fruit growth, albinism and fruit quality in strawberry (Fragaria×ananassa Duch). Fruits, 58, 221-227.
  18. Shahriari, S. (2011). The study on the effect of irrigation levels and mulch application on growth indices and essential oil content of peppermint (Mentha piperita L.). Planta Medica, 18, 77-88.
  19. Singh, R. & Asrey, R. (2005). Growth, earliness and fruit yield of microirrigated strawberry as affected by time of planting and mulching. Indian journal of horticulture, 62 (2), 148-151.
  20. Singh, R., Asrey, R. & Kumar, S. (2006). Effect of plastic tunnel and mulching on growth and yield of strawberry. Indian Journal of Horticulture, 63(1), 18-20.
  21. Singh, R., Sharma, R.R. & Goyal, R.K. (2007). Interactive effects of planting time and mulching on ‘Chandler’ strawberry (Fragaria×ananassa Duch.). Scientia Horticulturae, 111, 344-351.
  22. Sonsteby, A., Opstad, N., Myrheim, U. & Heide, M. (2009). Interaction of short day and timing of nitrogen fertilization on growth and flowering of Korona strawberry (Fragaria×ananassa Duch.). Scientia Horticulturae, 123, 204-209.
  23. Yuan, B.Z., Sun, J. & Nishiyama, S. (2004). Effect of drip irrigation on strawberry growth and yield inside a plastic greenhouse. Biosystems Engineering, 87, 237-245.
  24. Khochert, G. (1987). Carbohydrate determination by phenol-solphoric acid methods. In the handbook of physiological methods. J. A. Hellebust and J. S. Garigie (Eds). (pp. 96-97) Cambridge University Press.