نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران
2 گروه تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
source and amount of nitrogen-containing fertilizers in soilless cultivation significantly affects the phytochemical compounds of medicinal plants and production costs. This study was conducted to compare the effects of various urea-to-nitrate ratios with a common ammonium-to-nitrate solution regarding growth and the phytochemical compounds in the leaves of Stevia (Stevia rebaudiana Bertoni( in a soilless cultivation system, performed as a completely randomized block with three replications. The urea-to-nitrate ratios were tested at five levels: 0:100, 25:75, 50:50, 75:25, and 100:0, while the ammonium-to-nitrate ratio of 10:90 was considered as the control treatment. The results indicated a significant difference between the various urea-to-nitrate ratios and the ammonium-to-nitrate solution (control) concerning the yield of stevioside (p ≤0.001) and the yield of rebaudioside A and C (p ≤0.001). The highest yield of stevioside (2.3 grams per pot) and rebaudioside C (2.3 grams per pot) was obtained with an ammonium-to-nitrate ratio of 10:90. Different urea-to-nitrate ratios did not cause a significant difference in nitrate absorption, fresh and dry weight of the plant and plant height, leaf area and number. It can be concluded that the ammonium-to-nitrate ratio of 10:90 can be used as the optimal ratio in nutrient solutions in soilless culture, to enhance the phytochemical compounds of Stevia, particularly glycosides.
کلیدواژهها [English]
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