Statistical analysis of bedslope, shape and fertigation timing to reduce nitrate loss in furrow fertigation.

Parivash Raeisiyanfard,Sayyed-Hassan Tabatabaei,Azad Heidari

doi:10.31220/osf.io/tzcfj

Parivash Raeisiyanfard, Sayyed-Hassan Tabatabaei + Show 1 more

Open Access

https://doi.org/10.31220/osf.io/tzcfj

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Abstract

Abstract Improper use of chemicals in irrigation practices is one of the prime concerns for widespread surface and groundwater pollution in agricultural areas; thus, it is vital to improving chemical application through proper fertigation managements. This research focuses on the impact of shape, slope, and fertigation timing on furrow irrigation performance. The results demonstrated that the effects of furrow shape, bed slope, and timing of fertigation were statistically significant, and altering these parameters would change the absorbed nitrate and nitrate loss amounts.

Highlights

Low irrigation water and fertilizer distribution efficiency make agriculture a major nonpoint source of water resources degradation
The highest nitrate concentration belonged to the various furrow cross-sections with second-half fertigation (VCS-SH) and VCS-T treatments, respectively, which indicated the simultaneous impact of timing and cross-section at this part of the furrow
For the concave slope treatments (VS), the nitrate amounts were similar, and there was no significant difference between the treatments, which puts them in the same statistical class. It implied that fertigation timing was not a sensitive parameter at the downstream of the concave sloped field

Summary

Introduction

Low irrigation water and fertilizer distribution efficiency make agriculture a major nonpoint source of water resources degradation. Application of nutrients, as well as pesticides via irrigation systems (i.e. fertigation), enables control on the distribution and balance of the applied chemicals. Furrow irrigation has the potential to increase fertilizer distribution efficiency in agricultural fields (Walker and Skogerboe, 1987; Sedaghatdoost and Ebrahimian, 2015; Simunek et al, 2016). Simunek et al (2016) assessed the effects of different soil surface management strategies on root water and solute uptake along deep drainage and solute leaching. Their results indicated that the treatment which had plastic at the bottom of the furrow provided more water for transpiration; this treatment has more water lost due to deep percolation and evaporation

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