Effects of different drip irrigation threshold on water use and biomass of soilless culture anthurium in greenhouse

In order to explore appropriate irrigation mode of soilless culture anthurim, effect of drip irrigation with different irrigation threshold on water use and biomass of soilless culture anthurim in multi-span greenhouse were investigated. The experimental anthurium was planted in plastic pot with substrate. The low irrigation threshold was designed based on the proportion of irrigating substrate moisture content with the substrate moisture capacity(θFC), and treatments included 90%θFC(T1),80%θFC(T2),70%θFC(T3),60%θFC(T4) and 50%θFC(T5). Results showed that the irrigation water use efficiency was only 0.4 to 0.5 under experiment condition. The substrate moisture content and irrigation water use efficiency decreased with low irrigation threshold reduction, but the irrigation cycle increased reversely. Compared with T1, the flower size and quantity of T4 were similar, but the plant height and crown diameter were larger than T1 significantly, the plant height increased 19.3% and the crown diameter increased 14.7%. T2 and T3 had no obvious influence on anthurium’s flower and biomass compared with T1,but T5 reduced the flower size. Water consumption amount of one pot anthrium was about 2 522 g to 2986g during experiment. Compared with T1, water consumption amount of T2, T3,T4 and T5 decreased 4% to 16%. Lower water consumption amount and better flower quality were got from the treatment with low irrigation threshold of 60%θFC, so 60%θFC was appropriate low irrigation threshold for experimental anthurim.