اثر هیومیک پرایمینگ گیاهچه های سیب زمینی آگریا برای تولید غده‌چه‌های بذری

به منظور بررسی کارایی خیساندن گیاهچه های سیب زمینی رقم آگریا در غلظت های مختلف هیومات پتاسیم در طی زمان های مختلف برای تولید غده چه های بذری، آزمایشی به‌صورت فاکتوریل در قالب طرح پایه کاملاً تصادفی در سه تکرار انجام شد. فاکتورهای آزمایشی غلظت های مختلف هیومات پتاسیم (صفر، 0/25، 0/5، 0/75، 1، 1/25 و 1/5 گرم در لیتر) و سطوح مختلف مدت زمان پیش تیمار (صفر، 3، 6، 9 و 12 ساعت) بود. اثر متقابل غلظت هیومات پتاسیم و مدت زمان پیش تیمار روی صفات وزن تر و خشک بوته، ارتفاع بوته و تعداد برگ مرکب معنی دار شد. مصرف 1/25 و 1/5 گرم در لیتر هیومات پتاسیم منجر به افزایش معنی‌دار میانگین تعداد غده‌چه در هر گلدان نسبت به تیمار شاهد شد، همچنین بیشترین مقدار این صفت از پیش تیمار 12 ساعته به دست آمد. بالاترین میانگین تعداد غده‌چه در گیاهچه با مصرف 1/5 گرم در لیتر هیومات پتاسیم به دست آمد و 12 ساعت پیش تیمار نیز منجر به ثبت بیشترین میزان این صفت شد. بالاترین میانگین وزن غده چه ها با مصرف 1/5 گرم در لیتر هیومات پتاسیم به دست آمد. افزایش مدت زمان پیش تیمارکردن باعث بهبودی معنی‌دار در میانگین وزن غده‌چه‌های بذری نسبت به شاهد شد. پیش تیمارکردن گیاهچه های سیب زمینی با هیومات پتاسیم می تواند اثر مثبت و معنی داری روی تعداد و وزن غده چه های سیب زمینی بذری داشته باشد و هر چه مدت زمان بیشتری برای پیش تیمارکردن سپری شود، این تاثیر بیشتر می شود.

humic priming of agria potato seedlings for production of seed minitubers

extended abstract 1.    introduction: potato (solanum tuberosum l.) is one of the main crops for food security in the world. this plant has a cultivated area of more than 16 million hectares and a production of 360 million tons per year. this plant is propagated sexually (true potato seeds (tps)), and asexually (tuber formation), but for commercial purposes mainly seed tubers are used. the most important issue for the production of agricultural plants is the choosing appropriate method to propagate them (rashtian et al., 2024). minitubers are used to prevent diseases and pests and increase product yield (askari et al., 2023). minitubers are small seed potato tubers that are obtained from seedlings propagated in laboratory conditions. minituber production is one of the important methods of potato seed production and has created a bridge between rapid propagation of seedlings in glass and field propagation of seed tubers all over the world (struik et al., 2006). various agricultural factors, including the type of variety and the type and amount of fertilizer used in plant nutrition, can affect the quantity and quality of tubers produced (bolandi and hamidi, 2017). in recent decades, agriculture based on the use of biological fertilizers has been considered with the aim of eliminating or significantly reducing the consumption of chemical inputs. in sustainable agricultural systems, the use of biological fertilizers is of particular importance in increasing the quality yield (barzegari barogh et al., 2023). among the organic fertilizers that are used in agriculture today is humic (sardashti and mohammadian moghadam, 2016). humic matter is a natural polymer and is extracted from various sources such as soil, humus, peat, oxidized lignite (sebahattin and necdet, 2005). in this experiment, effect of pretreatment of potassium humate in different time levels investigated on production of potato seed minitubers.2.    materials and methods: the efficiency of potassium humate consumption levels through pretreatment times for potato seed minitubers cv. agria was conducted as an experiment at greenhouse of behparvar sabalan company in ardabil. a factorial experiment was carried out based on completely randomized design with three replications. treatments including were powder potassium humate fertilizer levels (0, 0.25, 0.5, 0.75, 1, 1.25 and 1.5 g/ l) and time of pretreatment levels (0, 3, 6, 9 and 12 hours). plant fresh weight, dry weight, plant height, compound leaves number, the average number of minituber per pot, the average number of minituber per seedling, average minituber weight, and average minituber diameter traits were studied. data were analyzed using sas version 9.4 software and means comparison was done through the least significant difference at five percent probability level.3.    results and discussion: analysis of variance showed that the interaction of potassium humate levels and pretreatment time levels on fresh and dry weight, plant height and numbers of compound leaves were significant at 5% probability level. the best treatment combination for fresh and dry weight was 1.5 g/l potassium humate consumption by 12 hours of pretreatment. in term of plant height, the lowest value was obtained in the combined treatments 0.5 g/l potassium humate without pretreatment, also by treatments combined with 12 hours pretreatment and consumption of 1.5 g/l of potassium humate, the highest number of compound leaves was observed. the average number of minituber per pot and seedling, average minituber weight and diameter minituber significantly affected by potassium humate levels and pretreatment levels at 1% probability level. 1.25 and 1.5 g/l consumption of potassium humate led to a significant increase in the number of minituber per pot compared to control, as well as the highest attribute was from 12 hours pretreatment. the highest average number of minitubers per seedling was obtained from consumption 1.5 g/l of potassium humate and 12 hours pretreatment had the highest value of this trait. in the absence of potassium humate consumption, average minituber weight was the lowest value, while the highest value was in 1.5 g/l of potassium humate.4.    conclusion: increasing of the pretreatment duration with potassium humate caused significant improvement in minituber number and weight compared to control. it concluded that pretreatment of agria potato seedlings with potassium humate before culture in greenhouse affected significantly positive effect on number and weight of potato seed minitubers, and this effect increased by more times pretreatment in high concentrations of potassium humate.