Impact of drainage water reuse on soil properties and tomato yield in Moghan plain

Abdi Agdam, Farshad (2017) Impact of drainage water reuse on soil properties and tomato yield in Moghan plain. Masters thesis, university of Mohaghegh Ardabili.

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Abstract

This study aimed to evaluate the use of drainage water in agriculture by the mixing canal water and drainage water to examine the effects on chemical, biological and physical properties of soil and yield of the crops in Moghan Plain, Iran. The experimental design was completely random, conducted with three different irrigation treatments and four replications, including the control treatment (canal water only), the second treatment (50% drainage water diluted with canal water) and the third treatment (drainage water only). Comparison of tretments related to different soil and plant characteristics between two years (1394-1395) performed as split plots in time. According to the results, various treatments had significant differences (p≤0.05) in terms of the effects on the microbial population, basal respiration and substrate-induced respiration. Using drainage for two years increased the electrical conductivity of soil solution significantly at 1% probability level. So that in drainage treatment (1/54 dS / m), more water irrigation treatments were 50% diluted with irrigation channel water (1/24 dS / m) and 50% water drainage treated with irrigation channel water It was more than control (0.62 dS / m). While, mean comparison of soil organic matter, yield and the chlorophyll content of tomato showed no significant differences between the treatments. The treatments did not differ significantly in terms of the bulk density in both years, whereas the Ks for the drainage water treatment differed significantly (p≤0.05) in 2016. No significant differences observed in the soil water retention function parameters of van Genuchten (θs, θr and α) among the treatments. Whereas the slope of the soil water retention curve differs significantly (p≤0.01) in the treatments of irrigation with 50% drainage water diluted with canal water as well as irrigation with drainage water. It could be concluded that although the use of drainage water negatively affected soil pH, salinity and biological properties, it did not decrease the Tomato plant yield.

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