分根区交替灌溉对盆栽甜玉米水分及氮素利用的影响

Effects of alternate partial root-zone irrigation on water and nitrogen utilization of pot-grown sweet corn

分根区交替灌溉(APR I)是高效节水新技术,该文通过盆栽试验,研究了不同水肥条件下,3种不同灌溉方式对甜玉米干物质积累、水分和氮素利用的影响。结果表明:在施肥和充分供水条件下,与常规灌溉(C I)相比,分根区交替灌溉节水29.1%,总干物质量和冠干物质量仅分别减少6.3%和5.6%,而水分利用效率和氮肥表观利用率分别提高24.3%和16.4%,这表明分根区交替灌溉的节水节肥效应要与合理施肥和适宜的灌水量相结合才能发挥更好的作用。而部分根干燥灌溉(PRD)由于总干物质量下降太多,水分利用效率和氮肥表观利用率都没有得到提高。

Alternate partial root-zone irrigation（APRI） is a newly high-efficient water ,saving technique. Effects of APRI on dry mass accumulation, water use and nitrogen （N） use of pot-grown sweet corn under different fertilization and irrigation levels were studied. Results show that under fertilization and sufficient irrigation, compared with the conventional irrigation（CI）, irrigation water in APRI treatment is saved by 29.1%, and total dry mass and shoot dry mass are only reduced by 6.3% and 5.6% respectively, but water use efficiency（WUE） and nitrogen apparent recovery are enhanced by 24.3% and 16.4%, respectively, which indicate that the efficient effect of alternate partial root-zone irrigation on water saving and fertilizer saving should combine with rational fertilization and suitable water supply. But in the partial root drying（PRD） treatment, both water use efficiency and nitrogen apparent recovery are not enhanced because of greatly reduced total dry mass.