Nitrogen and Water Utilization Efficiency of Barley Subjected To Desiccated Conditions in Moderately Salt-Affected Soil

Document Type : Original Article

Abstract

TRANSLOCATION of dry matter (DM) and nitrogen (N) in …. barley (Hordeum vulgare L. Giza 2000) subjected to desiccated conditions during pre and post heading in moderately salt-affected soil are important for food production. Nitrogen and water utilization efficiencies are paid an attention in the current investigation and prospected into account of both economic production and environment. The aim of the current study was to investigate the effects of water treatments [fully watering (FW) and desiccated watering (DW)] in response to five N applications 0, 35, 70,105 and 140 kg N ha-1 (0,15,30,45 and 60 kg N fed.-1) (ha.=2.38 fed) on N harvest index (NHI), N and DM translocation, N contribution, nitrogen use efficiency (NUE), nitrogen utilization efficiency (NUtE), N uptake efficiency (NUpE), apparent fertilizer N recovery (AFNR) and water utilization efficiency (WUtE) of barley. The application of either 105 or 140 kg N ha-1 resulted in the highest grain yield, NHI, DM translocation, N contribution and WUtE. Increasing the N application up to 70 kg N ha-1 resulted in the highest NUpE. NUE and NUtE were increased by increasing N application from 35 to 70 kg N ha-1, and were decreased gradually when higher N application was applied. On the other hand, there were no significant differences between the effects of water treatments on all above mentioned parameters, this could due to the timing of water application during water deficit. In conclusion, there were no significant between water treatments in terms of NHI, N and DM translocation, N contribution, NUE, NUtE, N uptake efficiency (NUpE), AFNR and WUtE, which support the hypothesis of better performance for barley plants when grown in desiccated conditions at 105 kg N-1 in moderately salt-affected soil.

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