不同氮水平下根区局部灌溉对烤烟产量、水分利用与氮钾含量的影响

Effects of partial root-zone irrigation on yield,water use,N and K contents of flue-cured tobacco under different N levels

通过盆栽试验研究在不同施氮(N)水平下,根区局部灌溉(部分根干燥和分根区交替灌溉)对烤烟产量、水分利用和烟叶氮钾含量的影响。结果表明,在不同施N水平下,与常规灌溉相比,部分根干燥灌溉(PRD)和分根区交替灌溉(APRI)的烤烟耗水量下降,产量有所减少,而水分利用效率提高7.5%和11.2%;施用N 0.20 g/kg土时,PRD和APRI中部叶N含量分别提高23.1%和25.2%,K含量分别提高33.6%和59.8%。在施用适量N肥条件下,根区局部灌溉生产的烟叶达到了优质烟叶N和K含量的要求。分根区交替灌溉和部分根干燥均是有效的节水优质适产的灌溉方式,但分根区交替灌溉的优势比部分根干燥的更为突出。

Effects of partial root-zone irrigation [partial root-zone drying （PRD） and alternate partial root-zone irrigation （APRI）] on yield, water use and leaf N and K contents of flue-cured tobacco under different N fertilization levels were studied by pot experiment. The results showed that partial root-zone drying and alternate partial root-zone irrigation treatments reduced tobacco water consumption and tobacco yield, but tobacco water use efficiency increased with 7. 5% and 11.2%, N and K contents of middle leaves treated with N 0.20 g/kg soil enhanced 23. 1% and 25.2%, 33.6% and 59.8M, respectively when compared to the conventional irrigation treatment. With the application of suitable N fertilization, the leaf N and K contents of flue-cured tobacco in partial root- zone irrigation met the requirement of higher quality tobacco production. The above results indicated that APRI and PRD were both efficient irrigation methods in saving irrigation water, increasing tobacco quality and keeping suitable yield, but alternate partial root-zone irrigation was better than partial root-zone drying.