Pinched sunflowers (Helianthus annuus ‘Teddy Bear’) produce high-quality flowers under high nitrogen fertilizer

Acta agriculturae Slovenica Pub Date : 2023-10-06 DOI:10.14720/aas.2023.119.3.2556

Yahya SELAHVARZI, Maryam KAMALI, Sajede KARIMPOUR, Mahdiyeh KHARRAZI, Mohammad KARIMI

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Abstract

This study was investigated the effect of removing the central bud (pinching) and different levels of nitrogen fertilizer urea on some morphological and physiological traits of ornamental sunflower. This study was conducted as a factorial experiment in a randomized complete block design with four replications on ornamental sunflower (Helianthus annuus ‘Teddy Bear’) at Horticulture Farm, Department of Horticulture, Ferdowsi University of Mashhad, Iran, in 2020-2021. The first factor was pinching in two levels (pinching and non-pinching) and the second factor was using urea at four levels (0, 200, 300, and 400 kg ha-1) in the form of water-soluble fertilizer. Results showed that the highest flower dry mass (59.25 g) was observed in pinched plants fertilized by 400 kg ha-1 of urea. Besides, the application of a high level of urea fertilizer and pinching treatment increased the amount of total chlorophyll and chlorophyll b. By removing the central bud, the amount of N, P, K, Ca, Zn, and Fe elements in the leaf increased by 1.5, 1.6, 1.3, 1.9, 1.4, and 1.5 times, respectively. Therefore, pinching and the adding of urea fertilizer at 400 kg ha-1is recommended for the production of high-quality sunflower plant ‘Teddy Bear’.

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摘向日葵(Helianthus annuus ' Teddy Bear ')在高氮肥条件下能开出高品质的花朵

以观赏向日葵为研究对象，研究了去中心芽(掐芽)和不同水平氮肥尿素对观赏向日葵部分形态和生理性状的影响。本研究采用随机完全区组设计，于2020-2021年在伊朗马什哈德Ferdowsi大学园艺系园艺农场对观赏向日葵(Helianthus annuus ' Teddy Bear ')进行了4个重复的析因试验。第一个因素是2个水平的捏施(捏施和不捏施)，第二个因素是4个水平(0、200、300和400 kg hm -1)的尿素以水溶性肥料的形式施用。结果表明，施用400 kg ha-1尿素的掐枝植株花干质量最高，为59.25 g;此外，施用高水平尿素肥和掐杀处理增加了叶绿素和叶绿素b的含量。去除中心芽后，叶片中N、P、K、Ca、Zn和Fe元素含量分别增加了1.5倍、1.6倍、1.3倍、1.9倍、1.4倍和1.5倍。因此，在优质向日葵“泰迪熊”的生产中，建议采用压榨和400 kg ha-1尿素肥的方式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta agriculturae Slovenica Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： Acta agriculturae Slovenica is a scientific journal published quarterly by the Agronomy, and the Zootechnical Departments of the Biotechnical Faculty, University of Ljubljana, Slovenia. Source of high quality research from the field of agronomy, zootechnics, applied biology and related fields from Slovenia and other countries.