highly significantp < 0.01
As shown in Table 5 , wheat-straw returning, K application, and their interaction exerted significant ( p < 0.05) or highly significant ( p < 0.01) effects on K translocation amount and K translocation contribution rate in stem sheaths (leaves) during the grain-filling stage, as well as K agronomic efficiency (KAE) and K physiological efficiency (KRE).