نوع مقاله : مقالات پژوهشی
نویسندگان
1 مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان گیلان، رشت، ایران
2 گروه علوم باغبانی، دانشکده کشاورزی دانشگاه زنجان، زنجان، ایران
3 علوم باغبانی، دانشکده کشاورزی دانشگاه گیلان، رشت، ایران
4 گروه خاکشناسی، دانشکده کشاورزی دانشگاه زنجان، زنجان، ایران
چکیده
محدوده وسیعی از ترکیبات کودی با فرمولها و کاراییهای مختلف در بازارهای جهانی موجود میباشد. علاوه بر کودهای شیمیایی مرسوم، کودهای کمپلکس شده آلی در ابعاد نانو بهعنوان یک نوآوری در بخش تغذیه کشاورزی محسوب میشوند. بنابراین، برای ارزیابی تأثیر چنین کودهایی در کشت و کار زیتون پژوهشی طی دو سال متوالی 1398 تا 1399 در یک باغ تجاری انجام گرفت. تیمارهای تغذیه شامل پنج تیمار از ترکیب عناصر نیتروژن و پتاسیم با دو منبع کودی نانو کود (نانو کود کلات نیتروژن و نانو کود کلات پتاسیم nano-NK) و کود شیمیایی (اوره و نیترات پتاسیم NK) بود. مقدار کود استفاده شده از هر دو منبع شامل دو سطح از غلظتهای 02/1 و 81/0 گرم در لیتر (N1K1 و nano-N1K1) و 36/1 و 08/1 گرم در لیتر (N2K2 و nano-N2K2) بهترتیب نیتروژن و پتاسیم خالص بود که در چهار مرحله تورم جوانه، قبل از شکوفایی گلآذین، سخت شدن هسته میوه و بعد از برداشت کنسروی میوه روی درختان محلولپاشی برگی شد. درختان شاهد در همان مراحل زمانی با آب محلولپاشی شدند. نتایج نشان داد که درختان تحت تیمار N2K2 دارای بالاترین عملکرد (43/36 کیلوگرم) بودند. از نظر محتوای عناصر معدنی هر دو فرم کاربردی کود منجر به افزایش غلظت عناصر نیتروژن و پتاسیم برگ در دو زمان اندازهگیری یعنی مراحل سخت شدن هسته میوه و بعد از برداشت کنسروی میوه در مقایسه با درختان شاهد شدند. بیشترین مقدار کلروفیل برگ مربوط به تیمار nano-N1K1 با میانگین بهترتیب 60/2 و 48/2 میلیگرم بر گرم وزن تر در دو زمان اندازهگیری بود. تیمار nano-N1K1در مرحله سخت شدن هسته میوه و تیمار nano-N2K2 در مرحله بعد از برداشت کنسروی میوه باعث افزایش مقدار کربوهیدرات برگ بهترتیب 39/1 و 48/1 برابر بالاتر از تیمار شاهد شد. تیمار nano-N1K1 با وجود عملکرد کمتر، نه تنها باعث افزایش درصد روغن شد بلکه منجر به بهبود خصوصیات کیفی روغن (اسیدچرب آزاد، ارزش پراکسید، شاخصهای K232، K270 و رنگیزههای روغن)، محتوای فنل کل، آنتیاکسیدان و پروفایل اسید چرب نیز گردید. با توجه به نتایج بهدست آمده، در مجموع عملکرد میوه تحت تأثیر تیمار کودهای اوره و نیترات پتاسیم در غلظت بالاتر و ویژگیهای کیفی روغن زیتون متأثر از تیمار با غلظت پائینتر نانو کلات قرار گرفت.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Effect of Foliar Application of Different Sources of Nano-Chelate Fertilizer (Nitrogen and Potassium) and Chemical Fertilizers (Urea and Potassium Nitrate) on Yield and Oil’s Quantity Attributes of Olive Tree cv. Zard
نویسندگان [English]
- Zohre Rohi Vishekaii 1
- Ali Soleimani 2
- Mahmood Ghasemnejad 3
- Akbar Hasani 4
1 Guilan Agricultural and Natural Resources Research and Education Center, Rasht, Iran
2 Department of Horticultural Science, University of Zanjan, Zanjan, Iran
3 Department of Horticultural Science, University of Guilan, Rasht, Iran
4 Department of Soil Science, University of Zanjan, Zanjan, Iran
چکیده [English]
Introduction
Olive tree, with a thousand years of cultivation history, is one of the most important horticultural crops in Iran and has always played an important economical role for orchardists. In olive orchards traits such as an increased formation of incomplete flowers, low yield of fruits and oil are often found as major problems. It should be noted that these traits are affected by numerous environmental and management factors from which the nutrition status is one of the most important ones. Proper nutrition plays an important role in both olive fruit and oil yield. There is a wide range of fertilizer compounds with different formulas and efficiencies available in the world market, among which nano-products are becoming increasingly popular. However, there is limited information on their efficacy in different plant species.
Materials and Methods
In order to evaluate the impact of fertilizers on olive cultivation, a research was conducted during two successive years from 2019 to 2020 in a commercial orchard on 15 year old olive tree cv. ‘Zard’, in Manjil city of Guilan province. Foliar application included five treatments using two types of fertilizers; nano (nano-chelated nitrogen and potassium: nano-NK) and chemical fertilizers (urea and potassium nitrate; NK). Treatments involved application of two concentrations from each fertilizers sources; 1.02g and 0.81g (nano-N1K1 and N1K1), 1.36 g and 1.08 g (nano-N2K2 and N2K2) of pure nitrogen and potassium, respectively. Foliar application was conducted in four stages bud-swelling, before blooming, pit hardening and shortly after harvest of table olive. Spraying with water was considered as the control. The nano-chelated fertilizers were obtained from Khazra Company, Teheran, Iran (http://en.khazra.ir). Spraying with water was considered as control. The experiment was performed in a randomized block design with three replications. The measurement of leaf nutrient status and its chlorophyll and carbohydrate contents were carried out at two times each growing season; in August (during pit hardening stage) and October (shortly after the harvest of table olive). At the green ripening stage, fruits were collected and weighted to determine fruit yield. At the end of the experiment quantity and quality traits of oil were measured.
Results and Discussion
The results showed that the trees under N2K2 treatment had the highest yield. In terms of mineral content, both forms of fertilizers increased the concentration of nitrogen and potassium leaf elements compared to the control trees. Chlorophyll content was affected by nano-N1K1 foliar application and carbohydrate content was affected by nano-N1K1 in the pit hardening stage and nano-N2K2 in shortly after the harvest of table olive. Nano-N1K1 treatment with the lower crop load not only increased oil content but also improved quality characteristics of olive oil (free fatty acids, peroxide value, specific ultraviolet absorbance K232, K270 and contents of pigments), total phenol content, antioxidant capacity and fatty acid composition. Generally, the results showed that olive trees responded well to fertilizer feeding. These trees produced better crop and higher quality oil in comparison with control trees. According to the results, fruit yield is better under urea and potassium nitrate treatment, and the quality of olive oil is more stable after nano-chelated nitrogen and potassium foliar application. It seems that the reason for the high amount of fruit yield with N2K2 in comparison to the slow-release property of nano-fertilizers is that using nitrogen and potassium in the form of ordinary chemical fertilizer regulates the biosynthesis, conversion and rapid translocation of assimilates and mineral elements into reproductive structures, which resulted in soaring yield. We assumed that nano-N1K1 foliar spray in the pit hardening stage and shortly after the fruit harvest for table olive might export the assimilation into the fruit to fulfill cell metabolism requirements for oil synthesis.
Conclusion
The current findings indicated that two of four treatments, i.e. nano-N1K1 and N2K2, could be more effective on olive trees in terms of general fruit and oil attributes. It was remarkable that nano treatment with a lower concentration could provide adequate beneficial effects on quality characteristics of olive oil and is in line with good management strategies regarding the preservation of the environment. To the best of our knowledge, the current work is the first report considering the application of nano-chelated nitrogen and potassium and their is use as a foliar application on olive trees. Additional studies would be necessary to further optimize the concentration and timing of the applications with these new formulations.
کلیدواژهها [English]
- Antioxidant capacity
- Fatty acid profile
- Foliar fertilizer
- Olive
©2023 The author(s). This is an open access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source.
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