The Interaction of Salinity, Irrigation Management, and Fertilization in Barley (Hordeum vulgare L.)
This work made publicly available electronically on February 14, 2013.
A greenhouse study was conducted involving interactive effects on barley yield of four levels of irrigation water salinity. three frequencies of irrigation water application, four levels of nitrogen. and three levels of phosphorus fertilization.
Dry matter and grain yields were reduced with decreasing irrigation frequency (2 days to 8 days) and increasing salinity of irrigation water (0.5 mmhos/cm to 13.5 mmhos/cm). Reductions in dry matter and grain yield were 31 and 88% over the ranges of irrigation frequency, respectively. Both dry matter and grain yield showed about 25% reduction over the range of irrigation water salinity. Increasing applied nitrogen (0 kg N/ha to 448 kg N/ha) increased dry matter production by 48%, yet grain yield showed slight reduction. Neither dry matter nor grain yield showed appreciable change with increasing phosphorus fertilization (0 kg P/ha to 89.6 kg P/ha). Decreasing leaching fraction (LF) increased both dry matter and grain yield to a certain limit then yield declined as LF decreased. Noticeable increase in the salinity of soil extract (EC ) was evident as irrigae tion water salinity increased. However, frequent irrigation appeared to produce a positive effect in preventing salt build up. (118 pages)