Effects of Regulated Deficit Irrigation on soil nutrient, microorganism and enzyme activity of Isatis indigotica

Abstract

The changes of soil ecological environment caused by different degrees of water deficit will affect the sustainable planting of soil, so it is of great significance to explore moderate water deficit and maintain a good ecological environment with sustainable soil. In this study, the effects of water stress on soil nutrients, microorganisms and enzyme activities of Isatis indigotica in Hexi corridor were studied by Mulched Drip Irrigation. The results showed that it was beneficial to the absorption and utilization of available phosphorus and available potassium in the soil of the root of Isatis indigotica by mild water deficit, increased the number of fungi and actinomycetes in the soil, and did not affect the activity of urease in the soil from 0 to 20cm. It was resulted in slow absorption of available phosphorus and available potassium in the soil and significantly decreased soil urease activity by severe water deficit, but it did not affect the number of fungi and actinomycetes. Therefore, mild water deficit is helpful to improve the utilization of soil nutrients and soil enzyme activity. This study provided a theoretical basis for the standardized planting of Isatis indigotica in northwest arid region on the basis of efficient water saving.