摘要
为了给紫色土合理施钾和提高钾肥利用效率,在国家紫色土肥力与肥料效益监测基地长期定位试验中,研究了不同施肥对冬小麦钾素吸收利用的影响。结果表明,土壤施用钾肥能明显促进冬小麦对钾素的吸收利用。冬小麦吸钾强度具有明显的规律性,表现为出苗～拔节盛期前吸钾强度很小,每日每公顷吸收钾素(K2O)仅0.168～0.540kg;拔节盛期～开花期,每日每公顷吸钾0.42～1.149kg;以后,小麦吸钾强度下降并有钾素外排现象。土壤非交换性钾和矿物钾是冬小麦吸收钾素的主要来源。
Wheat K absorption and utilization were studied on the national purple soil fertility and fertilizer (efficiency) monitoring base. The results indicated that wheat K utilization was obviously raised after K (application). The K absorption intensity changed regularly in the course of wheat growth and development. During the (period) of seedling stage to animated jointing stage, the K absorption (intensity) was very small ((only) 0.168~0.540 kg K2O·hm^(-2)·d^(-1)) in wheat. During the (period) of animated jointing stage to (flowering) stage, K absorption (intensity) quickly reinforced (0.42~1.149 kg K2O·hm^(-2)·d^(-1)). Then K absorption (intensity) decreased and companied with plant K transpiration. Soil non-exchangeable K (NEK) and mineral K (MRK) were the main sources from which the absorbed K was in wheat.
出处
《麦类作物学报》
CAS
CSCD
2004年第1期51-54,共4页
Journal of Triticeae Crops
基金
教育部科学技术研究重点项目(2003-58)。
关键词
小麦
钾素
吸收
利用
紫色土
Potassium
Absorption and utilization
Long-term (application)
Purple soil
