نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری خاکشناسی دانشگاه تربیت مدرس
2 استاد دانشگاه تربیت مدرس
3 عضو هیات علمی مرکز تحقیقات کشاورزی مازندران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This experiment was conducted in order to determine the effects of potassium and micronutrients on the yield and fruit quality of 8-year old orange trees cv. “Marrs” during 2001-2003, at Safi Abad agricultural research center (north Khuzestan) in Dezful, Iran. During first year, nine treatments were arranged in a randomized block design with three replications (each plot including one tree). Treatments were: T1: control, 1000 gr/tree ammonium sulfate as broadcasting application; T2: 1000 gr/tree ammonium sulfate as broadcasting application + 50 kg/tree organic matter and 250 gr/tree sulfur powder as localized placement; T3: T2 + 415 gr/tree potassium chloride; T4: T2 + 500 gr/tree potassium sulfate; T5: T2 + 830 gr/tree potassium chloride; T6: T2 + 1000 gr/tree potassium sulfate; T7: T3 + micronutrients consisting of zinc sulfate (120 gr/tree), iron sulfate (200 gr/tree) and manganese sulfate(200 gr/tree); T8: T4 + micronutrients (like T7); T9: T2 + 250 gr/tree potassium sulfate before start of the growth season + 207.5 gr/tree potassium chloride in the middle of growth season + micronutrients (like T7). Druing the second year, based on results of first year, nitrogen fertilizers were applied in all treatments. Also foliar application of Zn-EDTA (0.3%) was tried in T7, T8 and T9 treatments. The results of combined variance analysis revealed that yield of T7 and T8 treatments with 37.7 and 34.7 kg/tree increased significantly at 5% level as compared to control (25.2 kg/tree). Other treatments did not show any significant difference with control (T1). During the second year, foliar application of Zn-EDTA increased leaf zinc concentration significantly in T7, T8 and T9 in comparison with other treatments, but did not affect the yield or fruit quality indices. Other leaf mineral concentrations and fruit quality indices were not affected by the treatments.
کلیدواژهها [English]
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