Application of Plant Growth Regulators on Soft White Winter Wheat under Different Nitrogen Fertilizer Scenarios in Irrigated Fields

Ruijun Qin, Christos Noulas, Don Wysocki, Xi Liang, Guojie Wang and Scott Lukas
Additional contact information
Ruijun Qin: Hermiston Agricultural Research and Extension Center, Oregon State University, Hermiston, OR 97838, USA
Christos Noulas: Institute of Industrial and Forage Crops, Hellenic Agricultural Organization-“Demeter”, 41335 Larissa, Greece
Don Wysocki: Columbia Basin Agricultural Research Center, Oregon State University, Adams, OR 97810, USA
Xi Liang: Aberdeen Research and Extension Center, University of Idaho, Aberdeen, ID 83210, USA
Guojie Wang: Eastern Oregon Agriculture and Natural Resources Program, La Grande, OR 97850, USA
Scott Lukas: Hermiston Agricultural Research and Extension Center, Oregon State University, Hermiston, OR 97838, USA

Agriculture, 2020, vol. 10, issue 7, 1-13

Abstract: Lodging in cereal crops can result in yield loss and harvesting difficulties for growers. Application of plant growth regulator (PGR) has been an indispensable management practice to reduce lodging problems that are often exacerbated during high wind growing conditions and/or high nitrogen (N)/water environments, but the data is limited in the Columbia Basin of Oregon. The objective of this research was to evaluate the effect of two PGR products (chlormequat chloride-CC, trinexapac-ethyl-TE) at different rates and application timings on two soft white winter wheat varieties (ORCH-102 and SY Ovation). Crop growth (stem height and thickness), yield-related (spike density as ears m −2 , seeds per spike, grain weight) and quality parameters (test weight, protein) were measured for two cropping seasons from October 2017 to July 2019 following the application of the two PGR products at tillering (GS21-26), stem elongation (GS30-32), and/or flag leaf (GS37-39) stages under a high-N fertilizer scenario. In both growing seasons, no lodging problems were recorded for any treatments. The plant height was reduced after PGR application, but the impact on stem thickness was limited. PGR application slightly affected wheat yield, yield components, testing weight, and protein level in both growing seasons. Our results suggested that the effect of PGR application is relatively limited if no lodging problem occurred.

Keywords: chlormequat chloride-CC; trinexapac-ethyl-TE; nitrogen; stem height; wheat yield; lodging (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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