Investigation of alternate irrigation strategies using saline and non-saline water on yield and water productivity of grain maize in drip tape irrigation.
Message:
Abstract:
A field experiment was conducted with completely randomized block design، three replications and seven treatments for two lasted growth stages of corn. Treatments were: T1 and T2 (50% of T1): full and deficit irrigation with non-saline water، respectively; T3 and T4: variable and fixed full irrigation with saline-non saline water in every other row، respectively; T5 and T6: fixed and variable deficit irrigation with non-saline water in every other rows، respectively and T7: full irrigation with saline water. Irrigation water salinity in non-saline and saline treatment were 8 and 1. 5 dS/m، respectively. The results showed that instead of deficit irrigation with non saline water using alternate furrow irrigation، if not irrigated furrows are irrigated with saline water، are more effective when they are compared with deficit irrigation. In deficit irrigation treatments 29 and 36 % and in T3 and T4 about 50 % of fresh water was saved in 2012 and 2013، respectively. The quantitative comparison have shown a significant reduction in maize yield by 22% with deficit irrigation scenarios (T2، T5 & T6) when compared to salinity treatments (T3 & T4). In terms of water use efficiency، the results indicate that if fresh and saline water are considered as the same worth، deficit irrigation treatments have the highest water productivity and it was not significantly different with T1 treatment. However، water use efficiency is calculated on the basis of fresh water، treatments T3 and T4 are higher water use efficiency than others and، therefore the criteria above have been selected as the preferred option. However، water use efficiency is calculated on the basis of fresh water per treatment، the efficiency of water use in treatments T3 and T4 are higher than others and therefore، they will be selected as the best options.
Language:
Persian
Published:
Iranian Journal of Soil and Water Research, Volume:46 Issue: 1, 2015
Pages:
1 to 10
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