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. 2023 Jan 4;13:1067498. doi: 10.3389/fpls.2022.1067498

Table 4.

Studies that report effects of N deficiency on the root-to-shoot ratio (R_S) and root length per shoot biomass (LENG_SHOOT) at the field scale.

Reference Crop Soil Factors R_S LENG_SHOOT
(Sharifi et al., 2005) potato GEN DEV INCREASE INCREASE
(Xue et al., 2014) winter wheat DEV LEV INCREASE INCREASE
(Eghball and Maranville, 1993) maize silty clay loam LEV INCREASE VARIABLE
(Hadir et al., 2021) sugar beet silty loam DEV INCREASE DECREASE
(Welbank and Williams, 1968) barley DEV LEV INCREASE
(Anderson, 1988) maize silty loam DEV YEAR INCREASE
(Myers, 1980) sorghum clay loamy GEN DEV INCREASE
(Wang et al., 2005) winter wheat clay loamy IRR LEV YEAR INCREASE
(Feng et al., 2016) maize loamy clay, clay loam, sandy loam SOIL YEAR LEV VARIABLE VARIABLE
(Otto et al., 2014) sugarcane Typic Kandiudox, Rhodic Eutrudox SOIL LEV DEV VARIABLE
(Fang et al., 2022) maize loamy LEV YEAR DEV DECREASE DECREASE
(Louvieaux et al., 2018) oilseed rape DEV INCREASE
(Nakamura et al., 2002) sorghum GEN DEV INCREASE
(Comfort et al., 1988) spring wheat silty loam, clay loam GEN SITE LEV INCREASE
(Peng et al., 2012) maize silty loam DEV LEV YEAR   VARIABLE

DECREASE (in red): diminished R_S, LENG_SHOOT, VARIABLE (in yellow): diverse, inconclusive or no effects on R_S, LENG_SHOOT, and INCREASE (in green): higher R_S, LENG_SHOOT in case of deficient as compared to non-deficient conditions. Factors refer to the variables studied in each manuscript. LEV: several levels of N applied, DEV: several development stages investigated, YEAR: several years investigated, IRR: water treatments applied (such as irrigation and drought), PLAN: several planting methods tested, SOIL: several soil types tested, GEN: diverse genotype tested, SITE: different sites tested, TILL: several tillage practices tested. For more details refer to SI Table 1 .