Abstract
Given the shortage of fresh water in semi-arid and arid zones, wastewater is becoming an increasingly important source of irrigation. This study analyzes the principles of root water/nitrogen uptake dynamics in wastewater-irrigated pepper fields. Comparison of pepper root uptake rates of nitrogen show that the root uptake rate of NO3-N is an order of magnitude higher than that of NH4-N. When the original NO3-N content in the soil is high, additional wastewater irrigation will not increase the root uptake of NO3-N. The pepper root water uptake rates gradually increase with increasing light intensity and air temperature
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