Effects of different organic fertilizer treatments on soil water and soil physical properties in the semi-arid area of southern Ningxia.

【Objective】The study was to explore the effects of different organic fertilizer treatments on bulk density,capillary porosity,soil aggregates,soil water storage and WUE.【Method】We conducted the experiment to study the effects of soil water and soil physical properties under different organic fertilizer treatments(H:90t/hm2,M:60t/hm2,L:30t/hm2)for 3years(2007-2009)in southern semi-arid area of Ningxia.The winter wheat for this trial wasXifeng 26.【Result】Organic fertilizer treatments could improve soil porosity,the ability of soil water storage and the content of water-stable aggregates than no fertilizer treatments.Compared with the soil before the experiment,the soil bulk density in 0-60cm soil layer decreased by 5.3%,4.6% and 3.4%respectively on average through H,M and L treatments.Whether dry sieving or wet sieving,0.25mm aggregates increased significantly compared with the soil before experiment.And after wet sieving,the average increase of the content of0.25mm water-stable aggregates after H,M and L treatments on 0-40cm soil layer was 21%,28% and 29% respeetively.Soil water storage capacity showed significant difference between these organic fertilizer treatments and no fertilizer treatment in the regreening stage of winter wheat on 0-60cm soil layer.Following fertilization amount from high to low,the increase of soil water storage was 24.75,15.77,and 13.68mm respectively.There was significant difference between organic fertilizer treatments and no fertilizer treatment in the milking stage of winter wheat on 0-200cm soil layer.And the increase of high fertilizer treatment was 17%.Following the fertilization from high to low,WUE of winter wheat under different fertilizer treatments increased by 38%,38%,23% respectively compared with no fertilizer treatment.Moreover,WUEof winter wheat in high and low fertilizer treatment was significantly higher than that in no fertilizer treatment.【Conclusion】The organic fertilizer treatments can not only enhance the proportion of bigger aggregates,but also can improve the structure of soil.The suitable organic fertilizer treatment may be high fertilizer treatment,but this needs to be reconfirmed.