水、氮对不同收获时间菊芋株高和物质分配规律的影响

Effect of Water and Nitrogen on Yield and Biomass Allocation of Helianthus tuberosus

对不同水、肥及收获时间条件下菊芋的株高、生物量及物质分配规律进行研究,结果表明:施肥、灌水及施肥+灌水均能显著提高菊芋株高和产量(P<0.05);以饲料为主要利用目的的菊芋应该选择早期收获,以生物乙醇和菊粉原材料为主要利用目的应该选择适当晚期收获;施肥、灌水及灌水+施肥与对照相比均能够显著提高菊芋块茎比、根冠比(P<0.05);营养生长阶段施肥、灌水及灌水+施肥与对照相比能够显著提高菊芋叶重比(P<0.05),之后的水、肥对叶重比影响不显著;通过施肥、灌水能够改善土壤肥力,可以肥促根、以肥调水,提高土壤水分利用效率和增加块茎产量,在一定程度上提高菊芋能用价值。

Th thus tuberosus L. e effect of were stud fertilization and ied. The results were significantly improved by fertilization, irrigation on height, biomass and mater allocation of Helianshowed that the height and yield of Helianthus tuberosus I.. irrigation and fertilization ＋irrigation（P〈0.05） ; Helianthus tuberosus L should be early harvested when it was used for forage, and it should be lately harvested when it was used for bio-ethanol and inulin; The root/shoot ratio and luber mass ratio were significantly improved under fertilizer, water and fertilizer ＋water condition（P〈0.05） ; The leaf mass ratio was signifi- cantly improved under fertilizer, water and fertilizer ＋water condition during nutritional growth, and it was not significantly different after nutritional growth; The growth, yield, water use efficiency and the yield of tuber were enhanced by the application of fertilizer and water,and the using value for energy was improved by fertilization and irrigation.