Effect of cover crops on leaching of dissolved organic nitrogen and carbon in a maize-cover crop rotation in Mediterranean Central Chile

Salazar, Osvaldo; Balboa, Liliana; Peralta, Kiri; Rossi, Michel J.; Casanova, Manuel; Tapia, Yasna; Singh, Ranvir; Quemada, Miguel

doi:10.1016/j.agwat.2018.07.031

Cited by 40 publications

(21 citation statements)

References 52 publications

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“…A possible explanation is DOC excretion by deeper plant roots [121]. However, data for soils under crops are scarce and may not represent actual conditions for croplands, similar to [83].…”

Section: Databasementioning

confidence: 99%

Estimating dissolved carbon concentrations in global soils: a global database and model

et al. 2020

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Dissolved carbon (C) leaching in and from soils plays an important role in C transport along the terrestrial-aquatic continuum. However, a global overview and analysis of dissolved carbon in soil solutions, covering a wide range of vegetation types and climates, is lacking. We compiled a global database on annual average dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) in soil solutions, including potential governing factors, with 762 entries from 351 different sites covering a range of climate zones, land cover types and soil classes. Using this database we develop regression models to calculate topsoil concentrations, and concentrations versus depth in the subsoil at the global scale. For DIC, the lack of a proportional globally distributed cover inhibits analysis on a global scale. For DOC, annual average concentrations range from 1.7 to 88.3 (median = 25.27) mg C/L for topsoils (n = 255) and from 0.42 to 372.1 (median = 5.50) mg C/L for subsoils (n = 285, excluding lab incubations). Highest topsoil values occur in forests of cooler, humid zones. In topsoils, multiple regression showed that precipitation is the most significant factor. Our global topsoil DOC model ($${\mathrm{R}}^{2}=0.36$$ R 2 = 0.36 ) uses precipitation, soil class, climate zone and land cover type as model factors. Our global subsoil model describes DOC concentrations vs. depth for different USDA soil classes (overall ($${\mathrm{R}}^{2}=0.45$$ R 2 = 0.45 ). Highest subsoil DOC concentrations are calculated for Histosols.

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“…A possible explanation is DOC excretion by deeper plant roots [121]. However, data for soils under crops are scarce and may not represent actual conditions for croplands, similar to [83].…”

Section: Databasementioning

confidence: 99%

Estimating dissolved carbon concentrations in global soils: a global database and model

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A possible explanation is DOC excretion by deeper plant roots (Undurraga et al, 2009). However, data for soils under crops are scarce and may not represent actual conditions for croplands, similar to Salazar et al (2019).…”

Section: Modelmentioning

confidence: 99%

Global database and model on dissolved carbon in soil solution

Langeveld

Bouwman

Hoek

et al. 2019

Preprint

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Abstract. Abstract. Dissolved carbon leaching in and from soils plays an important role in C transport along the terrestrial-aquatic continuum. However, a global overview and analysis of dissolved carbon in soil solutions, covering a wide range of vegetation types and climates, is lacking. We compiled a global database on annual average dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) in soil solutions, including potential governing factors, with 762 entries from 351 different sites covering a range of climate zones, land cover types and soil classes. Using this database we develop regression models to calculate topsoil concentrations, and concentrations vs. depth in the subsoil at the global scale. For DIC, the lack of a proportional globally distributed cover inhibits analysis on a global scale. For DOC, annual average concentrations range from 1.7 to 88.3 (median&#8201;=&#8201;25.27)&#8201;mg&#8201;C/L for topsoils and from 0.42 to 372.1 (median&#8201;=&#8201;5.50)&#8201;mg&#8201;C/L for subsoils (excluding lab incubations). Highest topsoil values occur in forests of cooler, humid zones. In topsoils, multiple regression showed that precipitation is the most significant factor. Our global topsoil DOC model (R2&#8201;=&#8201;0.36) uses precipitation, soil class, climate zone and land cover type as model factors. Our global subsoil model describes DOC concentrations vs. depth for different USDA soil classes (overall R2&#8201;=&#8201;0.45). Highest subsoil concentrations are calculated for Histosols.

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“…This is due to the slow release of N that sometimes does not coincide with the stages of higher N uptake by the crops, increasing leaching (Kirchmann and Bergström, 2001). Research on fertilization management to reduce leaching is very limited in Chile, and it is also focused on industrial crops (Claret et al, 2011;Salazar et al, 2019). This suggests the need for further research by extending studies to the important vegetables consumed in the country.…”

Section: Introductionmentioning

confidence: 99%

Comparing nitrate leaching in lettuce crops cultivated under agroecological, transition, and conventional agricultural management in central Chile

González-Miranda¹,

Vidal

Peñaloza

2021

Chil. j. agric. res.

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Nitrogen overfertilization is a common horticultural practice in central Chile, leading to the risk of nitrate leaching and contamination of aquifers and groundwater. The aim of the present study was to evaluate the effect of organic amendments on NO3leaching. Three sites with different management systems were selected: Agroecological (AE, 3-yr agroecological management), Transition (TR, starting agroecological management), and Conventional (CN, traditional conventional management). Two lettuce (Lactuca sativa L.) growing cycles (autumn-winter and spring-summer) were implemented at each site. Nutrition at AE and TR was based on organic fertilizers and microorganisms, and inorganic N fertilizers were used at CN. The pore water was sampled at the beginning and at the end of each cycle at the 70 cm depth. Lettuce yields and unit weight were measured. There was a significant effect of the site and time of sampling (both p = 0.000) on the NO3concentration in leached water. At the beginning of the first cycle, nitrate leaching was 2.2 times higher at TR and CN (370 ± 81 mg L -1 ) compared with AE (163 ± 54 mg L -1 ), reflecting the loss of previously accumulated soil N. Afterward, leaching at CN remained higher than at AE and CN, significantly varying between sampling times; however, it decreased by 37% to 80% compared with the initial measurement. Leaching at both AE and TR remained stable within a low range of 38 to 96 mg L -1 . Results showed that organic soil management is able to maintain a low rate of nitrate leaching in the soil compared with conventional management.

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Effect of cover crops on leaching of dissolved organic nitrogen and carbon in a maize-cover crop rotation in Mediterranean Central Chile

Cited by 40 publications

References 52 publications

Estimating dissolved carbon concentrations in global soils: a global database and model

Estimating dissolved carbon concentrations in global soils: a global database and model

Global database and model on dissolved carbon in soil solution

Comparing nitrate leaching in lettuce crops cultivated under agroecological, transition, and conventional agricultural management in central Chile

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