Abstract:

The climate of Hexi corridor is very dry, and the evaporation is 20 times of the precipitation. The earth being sandy causes continuously seepage loss and poor water protection, which leads to larger amount of water consumption in turf planting, high cost and poor_quality turf. In this region, the experiment of turf planting was conducted with the water_saving techniques, such as spray irrigation, film_bottomed tillage. Compared with the traditional water flood irrigation, it indicated that film_bottomed tillage irrigation can largely improve water_saving (only 1/3 of the water of the wild flooding irrigation). The film_bottomed tillage irrigation and spray irrigation were employed at the same time, only 1/4 of the water was needed in comparison with the flood irrigation. The quality of grassland planted by three measures was observed, including overlay degree, chlorophyll content, number of tillering, homogeneity, quality, disease_resistance, etc. Through evaluating the turf by using the correlative method of the Grey Systematic Theory, we found that the turf quality was the best with the film_bottomed tillage irrigation and spray irrigation combined. Although the technique of turf plant with film_bottomed tillage and water saving irrigation need much manpower investment for the first year, but the life of film is according to 15 years, this planting effect is much better than the general planting method, economical benefit is very prominent. From long run, this technique has more economical benefit, can save water 5 000 m³·hm^-2 per year, and establish the well foundation of water saving irrigation in the arid desert region.

Key words: arid desert region, film_bottomed tillage in sandy land, water saving irrigation, planting turf_grass, quality evaluation