نوع مقاله : مقالات پژوهشی
نویسندگان
دانشگاه محقق اردبیلی
چکیده
بررسی کاربرد اسید هیومیک بر جذب عناصر غذایی و شاخصهای کمی و کیفی کیوی فروت در طی سالهای 94-95 در شهرستان تالش استان گیلان در قالب طرح بلوکهای کامل تصادفی با 7 سطح کاربرد برگی و خاکی هیومیکاسید در غلظتهای شاهد، 2، 4، 6 کیلوگرم در هکتار در چهار تکرار انجام شد. در این پژوهش شاخصهای جذب عناصر غدایی (ازت، پتاسیم، فسفر، کلسیم، روی، منیزیم، منگنز، مس و آهن) و صفات کمی و کیفی میوه (عملکرد، سفتی، ویتامین ث، مواد جامد محلول میوه و سطح برگ و میزان کلروفیل برگ) مورد اندازهگیری قرار گرفتند. نتایج حاصل از تجزیه واریانس دادهها نشان داد که غلظتهای مختلف اسیدهیومیک بر روی شاخصهای مورد اندازهگیری به جز سفتی میوه در سطح احتمال 1 درصد از نظر آماری تاثیر معنیداری داشتند. بر اساس نتایج بهدست آمده از این تحقیق، کاربرد اسیدهیومیک باعث افزایش جذب عناصر غذایی و بهبود کمی و کیفی میوه در کیوی شد. مقایسه میانگین دادهها نشان داد که بیشترین مقدار در شاخصهای جذب عناصر غدایی ازت، فسفر و کلسیم از تیمار 4 کیلوگرم و عناصر پتاسیم، منگنز و آهن از تیمار 6 کیلوگرم و عنصر منیزیم در تیمار 2 کیلوگرم در هکتار اسیدهیومیک بصورت مصرف خاکی حاصل شد. بررسی دادهها نشان داد که عناصر روی و مس در تیمار محلولپاشی با اسیدهیومیک به مقدار 2 و 4 کیلوگرم جذب بیشتری داشتهاند. بر اساس نتایج به دست آمده غلظت چهار کیلوگرم در هکتار اسیدهیومیک با روش کاربرد خاکی و برگی بیشترین اثر را برروی شاخصهای کمی و کیفی میوه کیوی داشتند.
کلیدواژهها
عنوان مقاله [English]
Investigation of Application of Humic Acid on Nutrient Uptake and Quantitative and Qualitative Indices in Kiwifruit
نویسندگان [English]
- Ali Akbar Shokouhian
- Ali Asghari
- Hadi Mahmoodi
University of Mohaghegh Ardabili
چکیده [English]
Introduction: Kiwifruit (Actinidia Sp) is one of the fruits that it is considered as an appropriate food source, because it is rich in vitamins, especially vitamins c, E, A, B1 and also in the form of potassium. Humic substances are contained nutrients that improve the soil nutrients and are increases the availability of food and therefore plant growth and yield. Studies have shown that adding certain amount of humic acid fertilizer can improve the growth of root, stem and leaves of plants and enhances yield and quality of products and increases the efficiency of nitrogen fertilizer consumption. According to pervious findings, recent research was performed aimed to achieving the best combination of humic acid and its application method for improving yield and organic fruits production in Kiwifruit cv. Hyvard.
Materials and methods: In order to investigate the effects of humic acid concentration and application method on nutrient uptake and quality and quantity of fruit indices, of Kiwifruit CV Hyvard an experiment based on complete block design with four replications was conducted during 2015-2016 in Talesh city, Gilan province. Experimental treatments included soil drenching method and foliar spraying of different levels (control, 2, 4 and 6 kg. ha-1) of humic acid. In this study traits such as absorption indexes of nutrient elements consisting nitrogen, potassium, phosphorus, calcium, zinc, magnesium, manganese, copper and iron content of leaves and quantitative and qualitative traits of fruit (yield, Tissue firmness, vitamin C, total soluble solids of fruits and leaf area and leaf chlorophyll content) were measured. Phosphorus was measured by spectrophotometer at 430 nm and potassium was measured by flame photometer. Atomic absorption was used to determine the amount of calcium (at wavelength of 422.7 nm) and magnesium (at wavelength of 285.2 nm). Nitrogen was also measured by Kjeldahl method. Micro elements were determined by flame atomic absorption method. Standard samples and treatments were cloudy with a blue acetylene flame and the adsorption of iron, manganese, zinc and copper were read at wavelengths of 243/3, 288.5, 213.9, 327.7 nm, respectively. This study was carried out in a randomized complete block design with seven treatments (0%) and application of humic acid at concentrations of 2, 4, 6 kg.ha-1 as spraying on leaves and soil application on Hayward cultivar with four replications. Data from this study were analyzed by using Jmp statistical software and graphs were drawn using Excel 2013 software.
Results and Discussion: Results of analysis of variance showed that different concentration of humic acid had significant effect on nutrient uptake and quality and quantity of fruit indices at 1% probability level. Results of this research indicated that using of humic acid caused increasing in nutrient elements uptake and improving the quality and quantity of fruit in Hyvard cv. of Kiwifruit. Comparison of means showed that the highest value of nitrogen (1.8%) of foliar application of 2 kg.ha-1 and 4 kg.ha-1 to soil of humic acid, phosphorus (0.3%) obtained by foliar application of 2 and 4 kg.ha-1, calcium (3.5%) by foliar and soil application of 4 kg.ha-1. The highest value of potassium (1.92) with soil application of 6 kg.ha-1, manganese (0.33%) and copper (12.8 Mg.Kg Dw-1) of foliar application of 4 kg.ha-1,iron (226 Mg.Kg Dw-1) of soil application 6 kg.ha-1 humic acid and the highest value of magnesium (34.7 Mg.Kg Dw-1) uptake index obtained from adding 6 kg.ha-1 humic acid to soil. The results indicated that foliar spraying of 2 kg.ha-1 humic acid had higher efficiency for zinc uptake (21.7 Mg.Kg Dw-1). Comparison of means showed that the lowest value of measured elements obtained in control treatment. Based on the results, the concentration of four kilograms per hectare of humic acid with soil and leaf application methods had the highest effect on quantitative and qualitative indices of kiwifruit.
Conclusion: Results showed that application of humic acid caused increasing in absorption of nutrients and improving the quality and quantity of fruit in Hyvard CV of Kiwifruit. Comparison of meanings showed that the application, soil application of 4 kg.ha-1 of humic acid, was more effective in absorption indices of nitrogen elements, phosphorus, calcium and quantitative and qualitative indices of kiwifruit. Treatment of 6 kg.ha-1 soil increased the adsorption of manganese and iron elements and soil treatment of 2 kg ha-1 humic acid had the highest absorption of magnesium. Data analysis showed that zinc and copper elements were more adsorbed in humic acid by 2 and 4 kg.ha-1 in spray application. In this study the lowest value of measured elements obtained in control trait.
کلیدواژهها [English]
- Iron
- Nitrogen
- Potassium
- Total soluble solids
- yield
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