摘要：Camellia oleifera is a common woody oil tree species in China. Potassium plays a vital role in its growth and fruiting, but the difference in potassium efficiency among varieties has yet to be investigated. In this paper, the seedlings of two C. oleifera varieties (Ganwu 1 and Ganshi 83-4) were selected for study. For both varieties, some seedlings underwent a potassium application of 2mM, whereas the control seedlings did not receive any potassium. The characteristics pertaining to the potassium efficiency of the two varieties were studied by measuring the growth and potassium concentration of the C. oleifera seedlings. Our results indicated that there were differences between the two C. oleifera varieties in their responses to potassium, most notably in the areas of aboveground growth, fine root growth, and dry biomass. After undergoing the potassium application, the growth of Ganwu 1 increased markedly, and its total biomass increased, but the aboveground growth and biomass of Ganshi 83-4 did not undergo a significant increase. Ganwu 15s potassium nutrient responsiveness was 3.38, which was about three times that of Ganshi 83-4 (1.11), indicating it is a potassium sensitive variety, whereas Ganshi 83-4 is a potassium insensitive variety. In both varieties, the potassium application increased the potassium concentration and accumulation in each organ of the C. oleifera seedlings, while simultaneously decreasing their potassium utilization efficiency. However, the increase of potassium accumulation in Ganwu 1 (139.1%) was higher than that in Ganshi 83-4 (99.6%), with Ganwu 15s potassium absorption efficiency also slightly elevated. In contrast, Ganshi 834 had a higher potassium efficiency coefficient and potassium utilization efficiency, indicating that Ganshi 83-4 was, overall, relatively more tolerant of low potassium conditions, and able to use potassium more efficiently.
