不同钾水平对剑麻生长和钾素吸收利用特性的影响

采用盆栽试验,研究4个不同钾(K2O)水平(0、76.8、84、91.2 mg/kg土)对剑麻幼苗生物学性状、生物量、养分含量和钾肥吸收利用效率的影响。结果表明,施钾处理剑麻株高和叶片长度显著提高,平均提高64.2%和59.7%。高钾处理K3地上部鲜重、干重显著提高23.2%、11.4%。根冠比随着钾水平的提高呈先增大后减小的趋势。施钾处理剑麻地上部、根系全钾含量显著提高,平均提高60.2%和158.7%。剑麻地上部和根系钾素吸收效率均随着钾水平的增加而增加,氮素和磷素吸收效率则随着钾水平的增加呈先增大后减小的趋势。而钾素利用效率则随着钾水平的增加而减小,施钾处理植株钾素利用效率平均下降31.0%。

Effects of Different Potassium Levels on Growth and Potassium Absorption and Utilization Efficiency of Sisal

Pot experiments were used to explore the effects of different potassium(K) levels on the biological character, biomass, potassium absorption and utilization efficiency of sisal seedling. Four levels of K fertilizer were: none(0 mg/kg), low(76.8 mg/kg), medium(84 mg/kg), and high(91.2 mg/kg). The results showed that compared to the none, using K fertilizer treatment, the plant height and leaf length increased significantly by 64.2% and 59.7%, respectively. When the K fertilizer was on the level of 91.2 mg/kg, the fresh weigh and dry weigh of aboveground were the largest, increased by 23.2% and 11.4%, respectively. The root: shoot ratio increased at first and then decreased with the increasing of K fertilizer. When used the K fertilizer, the total potassium content of aboveground and root increased significantly by 60.2% and 158.7%, respectively over the check. The K absorption efficiency of aboveground and root increased with the increasing of K fertilizer. The utilization efficiency of K absorbed into the sisal decreased with the increasing of K fertilizer. The utilization efficiency of N and P increased at first and then decreased with the increasing of K fertilizer. Compared to the check, the K utilization efficiency decreased by 31.0% as K fertilizer application increased.