Effect of different soil moisture treatments on growth of turfgrass

Five irrigation treatments, including full irrigation with reclaimed water, proper irrigation with reclaimed water, light water stress irrigation with reclaimed water, medium water stress irrigation with reclaimed water and severe water stress irrigation with reclaimed water were used to study the effect on turfgrass growth. Their irrigation start points were 80%, 70%, 60%, 50% and 40% of field capacity respectively and the irrigation amount for an irrigation event was same. The results showed that under the condition of precipitation higher than that in 50% hydrological years, it was benefit to turfgrass growth with high temperature, but the influence of irrigation quota on turfgrass growth was smaller. Under the condition of precipitation lower than that in 75% hydrological years, the response relationship between turfgrass growth and meteorological factors depended on irrigation quota, so proper irrigation was necessary for good qualify turf. The results based on path analysis showed that temperature was the main factor affecting the turfgrass growth under different water treatments in different hydrological years. On the other hand, once the precipitation was lower than that in 75% hydrological year, the turfgrass growth was promoted with high relative atmosphere humidity by regulating macroclimate.