ORIGINAL ARTICLE
Effect of Plant Growth Regulators Used with Adjuvants in Winter Wheat (Triticum aestivum L.)
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1
, Władysława Węgorka 20, 60-318, Poznań, Poland
 
2
, Pigwowa 16, 87-100, Toruń, Poland
 
3
, Wojska Polskiego 28, 60-637, Poznań, Poland
 
These authors had equal contribution to this work
 
 
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
 
 
Submission date: 2025-02-24
 
 
Acceptance date: 2025-05-23
 
 
Online publication date: 2025-06-02
 
 
Corresponding author
Kinga Matysiak   

Department of Weed Science and Plant Protection Technique, Institute of Plant Protection – National Research Institute, Władysława Węgorka 20, 60-318, Poznań, Poland
 
 
 
HIGHLIGHTS
  • Alignment with European agricultural goals regarding the reduction of chemical use
  • Possibility of combining mepiquat chloride and prohexadione calcium with adjuvants
  • Mixing growth regulators at lower doses and adjuvants maintains their effectiveness
  • Application of growth regulators with adjuvants prevents lodging and maintains yield
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ABSTRACT
Crop yields depend not only on genetic traits, agronomic practices, and weather but also on effective crop protection. European agriculture aims to reduce the use of harmful chemicals while maintaining yields. Studies show that adjuvants can reduce the required doses of plant protection products. While their role in herbicide and fungicide applications is well documented, research on plant growth regulators remains limited. Field trials were conducted at the Institute of Plant Protection – National Research Institute in Poland to evaluate the impact of reduced doses of growth regulators, along with adjuvants, on the growth and yield of winter wheat. The study aimed to evaluate the potential and effectiveness of combining the plant growth regulators mepiquat chloride and prohexadione calcium with various adjuvants and additives in winter wheat under field conditions. The experimental treatments included a mixture of mepiquat chloride with prohexadione calcium (Medax Top 350 SC) applied together with citric acid; fertilizers such as urea and ammonium sulfate; and adjuvants—including heptamethyltrisiloxane-modified polyalkylene oxide (Slippa), 76% paraffin oil (Atpolan 80 EC), 80% rapeseed oil fatty acid methyl esters, surface-active agents (surfactants), and a pH buffer (Atpolan BIO 80 EC), as well as ammonium sulfate ((NH₄)₂SO₄ – 40%), a cationic surfactant (20%), and triethanolamine (5%) (AS 500 SL). The studies showed that it is possible to achieve the same results using half the standard doses of regulators, combined with adjuvants, as when using full doses. This also applied to plant height as well as qualitative and quantitative grain parameters. Additionally, the findings demonstrated that the effect of mepiquat chloride combined with prohexadione calcium and adjuvants varied depending on weather conditions during crop growth.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
eISSN:1899-007X
ISSN:1427-4345
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