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The effects of different potassium fertilizer rates on lodging characteristics, forage yield and quality of two oat cultivars

agricultural-science
plant-science

Abstract

Lodging can restrict the stable and high yield of oats, and fertilization is an important factor affecting lodging of oats. In this experiment, potassium fertilizer (K 2 O) of 0(CK), 50(K50), 100(K100), 150(K150) and 200(K200) kg ha -1 was applied to two oat cultivars, respectively, to study the effects of different potassium fertilizer rates on lodging resistance, forage yield and forage quality of oats. The results showed that the application of potassium fertilizer effectively improved the lodging resistance of oats, and the minimum lodging rates of 'Menglong' and 'Qingyin No. 2' appeared in K200 and K100 treatments respectively, with the lodging rates of 0% and 10% respectively. TOP-SIS comprehensive evaluation showed that 'Menglong' had the best comprehensive performance under K150 treatment (0.6). The structural equation model showed that the interaction between cultivar and KFG had a significant effect on lodging rate (p < 0.01), stem diameter in the second section had a significant effect on fresh weight (p < 0.01), KFG had a significant effect on forage yield (p < 0.05), and cultivar and KFG had a significant effect on oat quality. This study establishes a theoretical foundation and practical framework for enhancing oat lodging resistance, forage yield and quality, and reveals that the potassium fertilization rate required to achieve high yield (with low lodging rate) and quality optimization necessitates cultivar-specific management strategies.
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