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چکیده
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The effect of replacement of KNO3 by KCl, with or without MgCl2 via use of various nitrogen sources in Hoagland and Arnon (1950) base nutrient solution on some quantitative and qualitative factors have studied in this paper. The five different solution were supplied in conformity with the experimental design were: KNO3 (control), KCl + NH4NO3, KCl + NH4NO3 + MgCl2, KCl + Ca (NO3)2, KCl + Ca (NO3)2 + MgCl2. Total yield, growth rate and ash amount was increased with replacement of KNO3 by KCl. Using of KCl via CaNO3 have improved total amount of element (ash), total chlorophyll content and fruit firmness in KCl + Ca (NO3)2 treated plants. Use of different treatment in solution have not any significant effect on fruit weight average, titratable acidity, pH, soluble solid content, fruit's dry matter, chlorophyll (a) and (b) content. Maximum growth and low ash rate was recorded in KCl+MgCl2+NH4 NO3-fertigated plants. Many articles confirm that NaCl was decrease yield and chlorophyll content, but our results show that chloride have positive effect on fruit yield and leaf chlorophyll content when was used lonely (without Na). The accumulation of some elements in different organs of both strawberry cultivars was significantly different when the various nutrient solutions were used. Replacement of KNO3 by KCl have caused to leave and fruits chloride amount was increased (P<0.05). Potassium concentration in Ca (NO3)2-treated plants was less than other treatment. Supplemental of MgCl2 cause to have increased potassium concentration in leaf and fruit samples. Despite some previous reports for other plants, chloride had no negative effect on the strawberries used in this study. It seems that, high amount of chloride in nutrient solution caused an improvement in some quantitative and qualitative factors in these cultivars. Also our result proposed to use of KCl as potassium source nitrogen source depend on our abject could be difference. If we want to increase yield, our results
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