Cation nutrient reserves decline markedly under intensive cropping of Pampas Mollisols

Larrea, Gastón; Wyngaard, Nicolás; Eyherabide, Mercedes; Calvo, Nahuel Reussi; Puricelli, Marino; Barbieri, Pablo; Angelini, Hernán Pablo; Salvagiotti, Fernando; Rozas, Hernán Saínz

doi:10.1016/j.catena.2023.106916

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…Over the past two decades, the reduction in the proportion of grasses in crop rotations has led to decreased organic matter content in the soils (Wyngaard et al, 2022). Additionally, cation extraction with crop harvest has led to acidified soils (Sainz Rozas et al, 2011;Sainz Rozas et al, 2019;Larrea et al, 2023). Currently, most soils in the Argentinean Pampas do not exhibit potassium deficiencies, although isolated cases have been reported in the northeastern part of the region (Sainz Rozas et al, 2019;Larrea et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, cation extraction with crop harvest has led to acidified soils (Sainz Rozas et al, 2011;Sainz Rozas et al, 2019;Larrea et al, 2023). Currently, most soils in the Argentinean Pampas do not exhibit potassium deficiencies, although isolated cases have been reported in the northeastern part of the region (Sainz Rozas et al, 2019;Larrea et al, 2023). Regarding micronutrients, the levels in the region are generally above critical thresholds, although there have been reports of zinc deficiency in some areas (Sainz Rozas et al, 2019;Larrea et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Catch crops in the Argentinean Pampas: a synthesis-analysis on nutrient characteristics and their implications for a sustainable agriculture

Cafaro La Menza,

Carciochi

2023

Front. Agron.

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Catch crops (CCs) are crops that grow between two cash crops, accumulating nutrients in their biomass and later releasing them through the decomposition of their residues. To our knowledge, no study has compared the nutrient-related traits of different CCs species. This comparison is essential for understanding the possible roles of CCs in agroecosystems and for optimizing adjustments of fertilizer rates. This study aims to: i) synthesize characteristics of the CCs, such as aboveground dry matter accumulation, nutrient [carbon (C), nitrogen (N), sulfur (S), and phosphorus (P)] concentration and accumulation, and C:nutrient ratios, ii) explore factors defining the mentioned characteristics, and iii) discuss their implications on the ecosystem services provided. By analyzing data from 52 studies, (98 site-years) in the Argentinean Pampas, we observed that grasses (excluding ryegrass) accumulated the greatest aboveground dry matter (6.08 ± 0.22 t ha-1, mean ± SE) and C (2.60 ± 0.13 t ha-1), making them suitable for protecting the soil surface from erosion, suppressing weeds, and improving C balances. Conversely, vetch accumulated the highest nutrient content (118 ± 5.3, 15 ± 1.5, and 14 ± 1.2 kg ha-1 for N, S, and P, respectively) with the lowest C:nutrient ratio (means of 15:1, 152:1, and 147:1 for N, S, and P, respectively), making it a suitable choice for recycling nutrients and providing extra N. Mixtures presented intermediate characteristics between the monocultures, allowing a balanced provision of the mentioned ecosystem services. Furthermore, the results showed that dry matter accumulation affected the nutrient-related traits analyzed, and it was related to different factors, such as CCs sowing and termination dates or precipitation. The analysis highlights the importance of selecting CCs species based on the desired ecosystem service and provides valuable information for producers as well as for modeling C balances and nutrient cycling.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catch crops in the Argentinean Pampas: a synthesis-analysis on nutrient characteristics and their implications for a sustainable agriculture

Cafaro La Menza,

Carciochi

2023

Front. Agron.

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Magnitude and driving factors of boron depletion in agricultural soils

Eyherabide,

Wyngaard,

Larrea

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundNeither the magnitude of boron (B) depletion in agricultural soils nor the driving factors of this process have been systematically studied before.AimsThe objectives of our study were to survey the extractable B (Be) in pristine soils as compared with cultivated soils, to estimate the yearly B depletion rate in agroecosystems, and to identify the edaphic, productive, and/or climatic factors determining that rate.MethodsSurface soil samples (0–20 cm layer) were taken from uncropped (UC) sites and nearby agricultural fields in 2011 and 2018 (AGR2011 and AGR2018, respectively) from the Argentinean Pampas. In these samples, Be and other edaphoclimatic and productive variables were determined, such as clay content, precipitation (PP), pH, evapotranspiration (ET), soil organic matter (SOM), and B removal with crop grains (RB).ResultsThe Be concentration decreased with agricultural activity, because UC soils had an average Be value of 1.9 mg kg−1, whereas AGR2011 and AGR2018 soils had values of 1.3 and 0.9 mg kg−1, respectively. The depletion rate from 2018 to 2011 ranged from 0.01 to 0.06 mg kg−1 y−1, and the main factors associated with this process were RB, PP, soil acidification, and SOM depletion (promoting B depletion) and ET and clay (reducing depletion).ConclusionAt current rates, B depletion from these agricultural soils could compromise B availability for crops in the short‐to‐medium term, depending on regional differences caused by edaphoclimatic and productive differences (RB, PP, pH, SOM, ET, and clay). Urgent actions are required to halt and/or revert this soil degradation process.

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Exploring maize grain yield response to boron fertilization in Mollisols: Critical thresholds and predictive models

Barbieri,

Crespo,

Wyngaard

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundThere are no extractable boron (B) thresholds for maize (Zea mays L.) in Mollisols determined by field calibrations.AimsOur objectives were to: (1) explore maize grain yield response to B fertilization, (2) calibrate the soil hot water extractable B (HW‐B) as a predictor of maize response to B fertilization under field conditions, and (3) assess the contribution of clay, pH, and soil organic matter (SOM) as predictive variables of maize response to B fertilization.MethodsWe conducted 53 field trials with 2 treatments: with and without B fertilization. At all sites, we measured clay, SOM, pH, and HW‐B at a 0–20 cm depth.ResultsMaize grain yield ranged from 5.34 to 17.35 Mg ha−1. Grain yield response to fertilization was observed in 6 out of 53 sites (11.3%). In responsive sites, average grain yield response was 1.0 Mg ha−1. Multiple regression models to predict yield response to B addition that included soil, pH, and SOM only explained 19% of the variability. The critical soil HW‐B concentration threshold was 0.78 mg kg−1, correctly diagnosing 79% of the site‐years.ConclusionThe critical threshold for maize B levels resulting from our field study is the first of its kind in Mollisols. This threshold will improve the identification of soils deficient in B.

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Cation nutrient reserves decline markedly under intensive cropping of Pampas Mollisols

Cited by 5 publications

References 36 publications

Catch crops in the Argentinean Pampas: a synthesis-analysis on nutrient characteristics and their implications for a sustainable agriculture

Catch crops in the Argentinean Pampas: a synthesis-analysis on nutrient characteristics and their implications for a sustainable agriculture

Magnitude and driving factors of boron depletion in agricultural soils

Exploring maize grain yield response to boron fertilization in Mollisols: Critical thresholds and predictive models

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