钾水平对甘蔗氮、磷、钾养分吸收利用的影响  

Effects of different potassium levels on nutrient absorption and utilization of N, P, K in sugarcane

作　　者：黄莹[1] 曾巧英[1] 敖俊华[1] 陈迪文[1] 周文灵[1] 卢颖林[1] 江永[1] 黄振瑞[1] 李奇伟[1] 

机构地区：[1]广州甘蔗糖业研究所/广东省甘蔗改良与生物炼制重点实验室,广东广州510316

出　　处：《广东农业科学》2013年第10期50-53,61,共5页Guangdong Agricultural Sciences

基　　金：国家现代农业(甘蔗)产业技术体系专项(CARS-20-3-1)

摘　　要：采用水培试验方法,研究不同钾水平对两个甘蔗品种(BC2-32和YT55)氮、磷、钾养分吸收利用的影响。结果表明:施钾使两品种的总干重显著增加,根冠比降低;不同钾处理下,BC2-32的根干重,根冠比均比YT55高,地上部则相反;随着钾浓度的升高,BC2-32的总干重增长幅度比YT55大;施钾显著提高了两品种的各器官氮、磷含量以及全株氮、磷积累量和利用效率,BC2-32的地上部氮、磷积累量分别占全株氮、磷积累量的比例以及氮利用效率在各钾处理下均比YT55低,而磷利用效率在较低钾处理下低于YT55,在较高钾处理下则相反;施钾显著提高了两品种的全株钾积累量,降低了钾利用效率,在不同钾处理下,BC2-32的钾素利用效率都高于YT55。Two sugarcane varieties were grown under hydroponic culture at different levels of potassium to evaluate their absorption and utilization of nitrogen, phosphorus and potassium. The result showed that with the increase in K level, the dry weight increased significantly, but the root/shoot ratio reduced. The root weight and root / shoot ratio of BC2-32 was higher than YT55 but the shoot dry weight was lower at different K levels. The growth rate of dry weight in BC2-32 was high than YT55 with the increase of K concentration.. High K levels could promote the N, P content in different organs and total accumulation amount of N, P in sugarcane. The utilization efficiency of N, P was significantly increased with the raising of K level. The ratio of N, P accumulation amount between shoot and plant and N utilization efficiency of BC2-32 were lower than YT55 at different K levels. The P utilization efficiency of BC2-32 was lower than that of YT55 under the low K treatment, but was opposite under the high K treatment. With the increase of K level, the plant K accumulation amount was increased significantly, whereas the utilization efficiency of K was reduced. The utilization efficiency of K in BC2-32 was higher than YT55 at different K levels.

关 键 词：钾水平 甘蔗 干物质 养分吸收利用 

分 类 号：S143.3[农业科学—肥料学]