Galina Gospodinova, Galia Panayotova
Trakia University, Faculty of Agriculture, Department of Plant Production, 6000 Stara Zagora, Bulgaria
Gospodinova, G. & Panayotova, G. (2019). Strategies for nitrogen fertilization of cotton (Gossypium hirsutum L.). A review. Bulg. J. Agric. Sci., 25 (Suppl. 3), 59–67
The purpose of this review was to summarize the results obtained in Bulgaria and other countries on the impact of mineral fertilization on cotton yield. All authors confirm that a significant increase in seed-cotton yield was achieved by both using new varieties and through optimal fertilization. Nitrogen as a nutrient is of great importance for cotton productivity. Nitrogen fertilization leads to stronger increase in leaf area, dry matter accumulation, boll size and number of bolls. Accumulated nitrogen mainly depends on formed dry matter. At low nitrogen rates yield increased at higher phosphorus level. Suppressant effect of high nitrogen rates on growth and development is emphasized in richer soil and under excessive moisture when maturity is delayed. A number of authors have found genotypic specificity of cotton yield as dependent on fertilization rate.