桐油包膜尿素的养分释放速度及其对黑麦草生长的影响

Nutrient release rate of tung oil-coated urea and its influence on ryegrass growth

表征了4种供试桐油包膜尿素(TCU)的特性和包膜形貌,测定了其养分释放曲线和释放速度。在不施基肥以及基施氮素15.8g/m2的尿素和4种TCU的情况下,用盆栽试验考察了各施肥处理对黑麦草生长、形态指标和色泽的影响。结果表明,所有施肥的处理均有助于黑麦草的出苗,在播种后的最初4～5周,TCU和尿素处理的黑麦草植株高度和生物量均优于未施基肥的处理,施肥处理间的差别不大;在播种的5～6周后,具有长释放周期的TCU UT-02(t8024d)和UC-04(t8026d)处理的黑麦草植株高度和生物量均超过了施尿素的处理,这些TCU处理的黑麦草的绿期长于7周,也优于尿素处理的黑麦草的绿期5周。

Basic features and coating layer morphology of 4 kinds of the oil of tung tree(Aleurites fordii)coated urea (TCU) were characterized, the nutrient released curve and nutrient released rate of TCU were also determined . Soil culture experiment was used to study the influence on growth, morphological index, and the color of ryegrass (Lolium perenne) with base fertilizer of urea and TCU at two levels of N fertilizer rate of 0 and 15.8 g/m2 . The results showed that all the basal dressing treatment had contributed the emerging of the ryegrass, after sowing 4-5 weeks, the plant height and biomass of ryegrass for TCU and urea treatment were superior to those of none-fertilizer treatment, however, the difference between TCU treatment and urea treatment was not remarkable. After sowing 5-6 weeks, the plant height and biomass of ryegrass for TCU treatment of UT-02 and UC-04(both with longer nutrient released period, theirs t80 reached 24d and 26d, respectively)were exceeded those of ryegrass for urea treatment, and the green periods was longer than 7 weeks for those TCU treatment, which was superior that of 5 weeks for urea treatment.