Calibration of maize phosphorus status by plant-available soil P assessed by common and process-based approaches. Is it soil-specific or not?
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | MOREL, Christian | |
| hal.structure.identifier | Plantes et systèmes de culture horticoles [PSH] | |
| dc.contributor.author | PLÉNET, Daniel | |
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | MOLLIER, Alain | |
| dc.date.accessioned | 2024-04-08T11:53:08Z | |
| dc.date.available | 2024-04-08T11:53:08Z | |
| dc.date.issued | 2021-01 | |
| dc.identifier.issn | 1161-0301 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/195517 | |
| dc.description.abstractEn | The sustainable management of phosphorus (P) fertility in agroecosystems depends on either soil- or plant-based diagnosis methods. Our overall objective was to determine the relationship between the P nutrition index based on a critical P dilution of maize (Zea mays. L.) and indicators of the soil P supply assessed using either a process-based approach or the common chemical extraction of the Olsen’ method. Long-term field experiments on mineral P fertilization, conducted at four sites with contrasting soil types representative of the main types of cropped soils in France, were selected to have deficient to excessive plant-available soil P. Three annual rates of superphosphate including no-P (P0) and about one (P1) and two (P2) times the annual P exported in harvests were studied, while the N and K supply was non-limiting. The shoot biomass (W, Mg DM ha−1) and its P concentration (Pmaize, g P kg−1 DM) were determined at 5–8 dates during the plant cycle after more or less two decades of P applications. Plant-available soil P in the ploughed layer was assessed by a functional and process-based approach that consists in determining together orthophosphate ions (oPions) concentration (CP, mg P L−1), and the oPions amount (Qw) in solution, and the amounts of diffusive oPions bound to soils (Pr, mg P kg−1 soil) that equilibrates the solution over time (t in minutes). We also assessed plant-available soil P by the Olsen’ extraction (Olsen-P). Shoot biomass significantly decreased for the P0 treatment while there was no significant differences between the P1 and P2 treatments. The Pmaize decreased as W increased. The criticalPmaize curve, the minimum Pmaize required to achieve maximum growth, was estimated using all data of the P1 treatment from the four sites: 3.66 × W−0.238 (r² = 0.61 for 78 observations). At maturity, the P nutritional index (PNI), calculated as the measured Pmaize divided by the criticalPmaize, ranged from 53 % to 92 % for the P0 treatment and from 94 % to 128 % for the P1 and P2 treatments. The CP values ranged from 0.04 to 2.25 mg P L−1. The Pr values were described accurately by: Pr = v × CPw × tp for t <400 min with (v, w, p) highly different across soils types. Calibrations of PNI to CP or to Olsen-P were both soil-specific. The new result brought by this study was that a unique calibration curve for all sites was obtained for PNI vs (Qw + Pr) considering a period of resupplying soil solution oPions of about one day. All points fell on the same regression line suggesting that this soil- and plant-based methods of diagnossis would both equally effective. This result provides new evidence of much better relevance and reliability of the process-based assessment rather than chemical extraction to adequately estimate the fraction of soil P that contributes to plant nutrition. The plant available soil P stock was better evaluated by the process-based approach because oPions buffering capacity of soils was accounted for. Consequently, the relationship between plant and soil indicators was highly improved. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Cropland | |
| dc.subject.en | Critical plant P concentration | |
| dc.subject.en | P nutritional index | |
| dc.subject.en | PNI | |
| dc.subject.en | Diagnosis | |
| dc.subject.en | Ions orthophosphates | |
| dc.subject.en | Maize | |
| dc.subject.en | Olsen extraction | |
| dc.subject.en | Soil-Solution diffusion | |
| dc.subject.en | Long term field | |
| dc.subject.en | Experiment | |
| dc.title.en | Calibration of maize phosphorus status by plant-available soil P assessed by common and process-based approaches. Is it soil-specific or not? | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.eja.2020.126174 | |
| dc.subject.hal | Sciences de l'environnement | |
| bordeaux.journal | European Journal of Agronomy | |
| bordeaux.page | 1-12 | |
| bordeaux.volume | 122 | |
| bordeaux.hal.laboratories | Interactions Soil Plant Atmosphere (ISPA) - UMR 1391 | * |
| bordeaux.institution | Bordeaux Sciences Agro | |
| bordeaux.institution | INRAE | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02962163 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02962163v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=European%20Journal%20of%20Agronomy&rft.date=2021-01&rft.volume=122&rft.spage=1-12&rft.epage=1-12&rft.eissn=1161-0301&rft.issn=1161-0301&rft.au=MOREL,%20Christian&PL%C3%89NET,%20Daniel&MOLLIER,%20Alain&rft.genre=article |
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