D.M. SABRA, A.M. REDA, E.A. EL-SHAWY, Y.Z. EL-REFAEE, and R.E. ABDELRAOUF
To cite this manuscript: Sabra DM, Reda AM, El-Shawy EA, El-Refaee YZ, Abdelraouf RE (2023). Improving barley production under deficient irrigation water and mineral fertilizers conditions. SABRAO J. Breed. Genet. 55(1): 211-229. http://doi.org/10.54910/sabrao2023.55.1.20.
Scarcity in irrigation water led to a gradual increase in water stress, consequently causing a decrease in dry matter, nitrogen uptake, productivity, and the protein content of barley. During two growing seasons, 2020–2021 and 2021–2022, two field experiments ensued to improve barley production in sandy soil under a deficit of irrigation water. The statistical analysis helped recommend the best factors to achieve maximum benefit with barley production under dry conditions and nitrogen mineral fertilizers. The significant variations occurred when irrigating with 60% full irrigation only, but were nonsignificant when irrigating with 80% full irrigation. Increasing the number of mineral fertilization doses to nine times resulted in higher nitrogen concentrations and availability inside the root-spreading area for the longest possible period without washing outside the root-spreading area by deep percolation than when given with three doses only. Irrigating with 80% full irrigation and nine dosages of mineral fertilization obtained the highest and best yield values. It resulted in a 20% reduction in irrigation water use and increased nitrogen fertilizer effectiveness through repeated application doses, resulting in increased productivity and less groundwater pollution. The simulation model received SALTMED model values with high accuracy for most of the studied traits; the R2 was not less than 0.97; therefore, it can function well under sandy soil conditions, which suffer from water scarcity.
Keywords: Deficit irrigation, fertilization doses, SALTMED model, soil moisture, water stress, water productivity, barley
Key findings: The low productivity of barley crops results in less irrigation water. Saving 20% of irrigation water happened with nonsignificant differences in productivity values when irrigating 100% or 80% of full irrigation occurred. Increasing the frequency of fertilizing doses leads to higher productivity values. Using the SALTMED Model gave high accuracy in simulating actual results.
SABRAO Journal of Breeding and Genetics
55 (1) 211-229, 2023
http://doi.org/10.54910/sabrao2023.55.1.20
http://sabraojournal.org/
pISSN 1029-7073; eISSN 2224-8978
Date published: February 2023
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