Variable root:shoot ratios and plant nitrogen concentrations discourage using just aboveground biomass to select legume service crops

Pinto, Priscila; Rubio, Gerardo; Gutiérrez, Félix; Sawchik, Jorge; Arana, Santiago; Piñeiro, Gervasio

doi:10.1007/s11104-021-04916-x

Cited by 23 publications

(11 citation statements)

References 53 publications

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“…Yet, significant amounts of N released in synchrony with crop uptake could be undetected by soil sampling, either due to (a) lack of sensitivity of regular soil N tests to small differences in N (Mueller et al., 2018), (b) other soil organic sources (McDaniel et al., 2020), or (c) the length of intervals between sampling dates. Thus, N released from aboveground as well as from belowground crop residues (Pinto et al., 2021; Taveira et al., 2020) could have differed between treatments. This could partially explain the larger contribution of SNF to N uptake on N0 plots (relative to the N240) observed under dryland.…”

Section: Discussionmentioning

confidence: 99%

“…Multiple locations are also desirable because the SNF process presents a strong dependency on environmental factors (Borja Reis et al., 2021) and because soil N dynamics could be highly dependent on soil and weather conditions, such as the occurrence of extreme precipitation events favoring N leaching beyond the root zone (Iqbal et al., 2018), among others. Lastly, including the evaluation of belowground biomass and N components (Pinto et al., 2021) could provide key information toward a more comprehensive picture about N dynamics within a corn–soybean crop rotation.…”

Section: Discussionmentioning

confidence: 99%

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Footprints of corn nitrogen management on the following soybean crop

et al. 2022

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Corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] is among the most typical crop rotations in the U.S. Corn Belt, and N is the most limiting nutrient for both crops.This study aims to assess the effects of N management for corn on the following soybean crop. Two corn-soybean rotation N fertilizer rate studies-a long-term study (1983 and a two-season study (2019-2020, Case Study II)were conducted in Kansas (United States). Case Study I focused on soybean seed yield as the response variable, whereas Case Study II included a detailed seasonal characterization of soil N, symbiotic N fixation (SNF), and plant N uptake for soybean considering N fertilizer rates on the previous corn crop. Apparent N budgets from corn (N fertilizer minus grain N removal) ranged from approximately −100 to approximately +50 kg N ha −1 , and soybean yields were slightly or not affected by corn N management. Case Study I showed that long-term N budgets in corn crops did not affect the following soybean crop yields. In Case Study II, the previous corn N management produced negative or small N surplus that influenced neither soil residual N nor SNF, without compromising soybean productivity. Farmers applying close to economic optimum N rates on corn will likely not generate scenarios of N surplus to compromise SNF or soybean yields. Forthcoming research should further address how long-term and large soil N mining or surplus in corn may enhance or inhibit N fixation for the next soybean crop. INTRODUCTIONAlternating soybean [Glycine max (L.) Merr.] with corn (Zea mays L.) has been demonstrated to promote higher yields than monocrop scenarios (

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Footprints of corn nitrogen management on the following soybean crop

et al. 2022

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“…Rice–soybean and rice–cover crop systems sustained TN, which could suggest substantial N contributions through biological N fixation by the annual legume cover crop and the soybean included in these systems. For example, T. alexandrinum is reported to be one of the top‐ranked species in terms of biological N fixation (Pinto et al., 2021). Additionally, it is possible that the relatively low soybean grain yield (2.5 Mg ha −1 ), which indicates the low N removal by this crop and the relatively high contribution through biological N fixation, resulted in a slightly negative or neutral apparent N balance (Salvagiotti et al., 2008; Santachiara et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The shoot/root ratios of cover crops used were those reported by Pinto et al. (2021): 8 and 6 for ryegrass and Egyptian clover, respectively. Shoot/root ratios for soybean (5) as well as the perennial pasture (2) were based on Bolinder et al.…”

Section: Methodsmentioning

confidence: 99%

“…A value of 7 was used for rice based on previous measurements of the shoot/root ratio in Uruguay (Deambrosi and Mendez, personal communication, October 2018), similar to the values reported by Ju et al (2015) under different N rates and varieties. The shoot/root ratios of cover crops used were those reported by Pinto et al (2021): 8 and 6 for ryegrass and Egyptian clover, respectively. Shoot/root ratios for soybean (5) as well as the perennial pasture (2) were based on Bolinder et al (2007).…”

Section: Soil and Plant Samplingmentioning

confidence: 99%

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Irrigated rice rotations affect yield and soil organic carbon sequestration in temperate South America

et al. 2022

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Rice (Oryza sativa L.) systems rotated with perennial pastures have intensified in South America to increase annual grain productivity, but the effects on rice yield and soil quality remain poorly understood. We evaluated rice grain yield, crop and pasture biomass production, and soil organic carbon (SOC) and total nitrogen stocks (0-15-cm depth) in three rice-based rotations over 8 yr in Uruguay. Treatments were: (a) rice-pasture [a 5 yr rotation of rice-ryegrass (Lolium multiflorum Lam.)-rice, then 3.5 yr of a perennial mixture of tall fescue (Festuca arundinacea Schreb.), white clover (Trifolium repens L.), and birdsfoot trefoil (Lotus corniculatus L.)], (b) rice-soybean [a 2-yr rotation of rice-ryegrass-soybean (Glycine max [L.] Merr.)-Egyptian clover (Trifolium alexandrinum L.)], and (c) rice-cover crop (an annual rotation of rice-Egyptian clover). Rice after soybean or pasture achieved the highest yield (9.8 Mg ha -1 ), 9% higher than rice after rice in the rice-pasture and rice-cover crop systems. Estimated belowground biomass under rice-pasture (2.7 Mg ha -1 ) was 12 and 42% greater than under rice-cover crop and rice-soybean rotations, respectively. Rice-pasture showed an increase of 0.6 Mg ha -1 yr -1 of SOC; no changes were observed in the intensified rotations replacing pasture with additional rice or soybean. All systems sustained soil total N. These results provide insights for implementing sustainable rice-based rotations, with rice-pasture being the only system that increased SOC while achieving high rice yields and belowground biomass productivity.

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Background soil nitrogen regulates the contribution of cover crop-derived nitrogen into subsequent crop

Farzadfar

Congreves

2022

Biol Fertil Soils

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Variable root:shoot ratios and plant nitrogen concentrations discourage using just aboveground biomass to select legume service crops

Cited by 23 publications

References 53 publications

Footprints of corn nitrogen management on the following soybean crop

Footprints of corn nitrogen management on the following soybean crop

Irrigated rice rotations affect yield and soil organic carbon sequestration in temperate South America

Background soil nitrogen regulates the contribution of cover crop-derived nitrogen into subsequent crop

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