Correction: Plant Biostimulants: Importance of the Quality and Yield of Horticultural Crops—A Review: Agronomy 2019, 9, 335

In Drobek at al. [1], an error was introduced. We propose the following amendment: Chemical acid or alkaline hydrolysis are generally used to produce biostimulants of animal origin, from raw materials such as hen feathers, bone meal, casein, collagen from skins, animal tissue or fish waste (Table 1). Biostimulants of plant origin are produced mainly using enzymatic hydrolysis.

The authors apologize to readers for an error in the article. All inaccuracies have been corrected and the article will be updated.