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Winter wheat root distribution with irrigation, planting methods, and nitrogen application

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Abstract

Soil water uptake is a function of root growth and distribution. Therefore, restrictions on root system growth may reduce water and nutrient uptake, which results in slower plant growth. The objective of this study was to determine the effects of different irrigation strategies, nitrogen application rates, and planting methods on the winter wheat root growth. The experimental factors included two irrigation strategies (variable alternate furrow irrigation defined as partial root-zone irrigation and ordinary furrow irrigation), two planting methods (in-furrow planting and on-ridge planting), and three nitrogen (N) application rates (0, 150, and 300 kg N ha−1) in 2015–2016 and 2016–2017 growing seasons. Results indicated that the in-furrow planting decreased mean root length density and root mass density (8% and 10%, respectively, in the fertilized treatments) compared to that obtained in the on-ridge planting. The partial root-zone irrigation reduced root length density by about 5% and 7% in the fertilized treatments compared to that obtained in full irrigation in the first and second year, respectively; however, these reductions were not statistically significant. Furthermore, the results implied that nitrogen fertilizer application increased root length density by 48% and 24% in the first and second year, respectively. Likely, root mass density increased by 32% and 5% in the first and second year, respectively. The exponential decaying relationship between root length density and soil depth indicated that the in-furrow planting with 300 kg N ha −1 produced the highest root density at the soil surface layer and reduced deep root penetration compared to the on-ridge planting and the other N treatments. Further analysis revealed that grain yield linearly correlated with root length density and root mass density in the first year. However, a polynomial (quadratic) relationship was obtained in the second year. Consequently, increasing the main root traits, including root length and root mass, enhanced winter wheat grain yield until it reached a threshold value. Higher values negatively affected grain yield, which might be due to allocating carbon to roots instead of grains.

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Abbreviations

I1: OFI:

Ordinary furrow irrigation

I2: VAFI:

Variable alternate furrow irrigation

PRD:

Partial root-zone irrigation

P1: ORP:

On-ridge planting

P2: IFP:

In-furrow planting

N0:

0 kg N ha1

N1:

150 kg N ha1

N2:

300 kg N ha1

SRL:

Specific root length

RMD:

Root mass density

RLD:

Root length density

ETc :

Actual evapotranspiration

SWD:

Soil water deficit

DAP:

Days after planting

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Acknowledgements

This research was supported in part by a research project funded by Grant no. 99-GR-AGR 42 of Shiraz University Research Council, Drought Research Center, the Center of Excellent for On-Farm Water Management, and Iran National Science Foundation (INSF).

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Correspondence to Ali Reza Sepaskhah.

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Mehrabi, F., Sepaskhah, A.R. & Ahmadi, S.H. Winter wheat root distribution with irrigation, planting methods, and nitrogen application. Nutr Cycl Agroecosyst 119, 231–245 (2021). https://doi.org/10.1007/s10705-021-10120-1

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