Foliar K application to rainfed wheat in a soil testing high K as an option to improve K use efficiency, grain yield and yield components

• Published in: Journal of plant nutrition 2020-05, Vol.43 (8), p.1080-1090
• Main Authors: Limon-Ortega, Agustin, Munguia-Lopez, Juan P., Espitia-Rangel, Eduardo
• Format: Article
• Language: English
• Subjects: accumulated precipitation; Agricultural production; Crop yield; Grain; grain yield; granular K; plant nutrition; potassium; potassium fertilizers; potassium use efficiency; reproductive stage; Seasons; soil; Soil conditions; Soil testing; Soils; Triticum aestivum; water shortage; Wheat
• ISSN: 0190-4167; 1532-4087; 1532-4087
• DOI: 10.1080/01904167.2020.1724301

Granular application of potassium (K) in soils testing high is generally not recommended. However, the effect of foliar K on rainfed wheat (Triticum aestivum L.) under these soil conditions is largely unknown. The objective of this work was to identify the effect of K fertilizer on K use efficiency (KUE), grain yield and yield components of wheat. The data were collected until 2017 in an ongoing trial established in 2007 with eight treatments; two granular K rates (0 and 50 kg K ha −1 ); two foliar N rates (0 and 3 kg N ha −1 ); and two foliar K rates (0 and 3 kg K ha −1 ) in a split-split plot arrangement. Treatments were applied to the same plots each season. Treatment with foliar K resulted in the highest KUE response but the effect size varied according to the accumulated precipitation during the reproductive stage. On average, KUE was enhanced in crop seasons with water constrains (