Effect of chemical Fertilization and planting space on growth and flowers production of Helichrysum bracteatum andr. plant
2011
Soliman, D.A.
Two field experiments were carried out at the Agricultural Experiment and Research Station, Faculty of Agriculture, Cairo University, Giza during 2006-2010 to study the effect of plant spacing ,nitrogen and potassium fertilization on the vegetative growth ,flower production and chemical composition of strawflower plant (Helichrysum bracteatum Andr.).Planting space treatments were 20, 30 and 40cm. Fertilization treatments by using ammonium nitrate (33.5%N) at the rates of 100,150 and 200Kg/fed (Nl, N2, N3, respectively) and potassium sulphate (48%K2O) at the rates of 50 and 75Kg/fed (Kl, K2 respectively), in addition to control treatment. The results indicated that the highest values for plant height, stem diameter, number of leaves and branches/plant, leaf area, number. of spray/plant, number of inflorescences/spray, number of inflorescences/plant, inflorescence diameter, fresh and dry weights of spray, total carbohydrates percentages in leaves and first spray, pigments (chlorophyll a, b and carotenoids) nitrogen, phosphorus, potassium content in the leaves, at the first and final spray were obtained for planting distance of 40 cm. The application of NK treatment increased plant height, number of branches, fresh and dry weight of leaves and plant, inflorescences characters, total carbohydrates percentages, pigments content, nitrogen and potassium content in the leaves and spray as compared with control plant. Interaction between plant spacing and NK resulted in the maximum values for the number of leaves, branches /plant, leaf area, number of inflorescence/plant, inflorescence diameter, fresh and dry weight of spray, content pigments, nitrogen and potassium in leaves and spray cultivated at 40cm apart with application of 200kg ammonium nitrate and 75kg potassium sulphate.
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