Diagnostic de la nutrition minérale de prairies permanentes au printemps. I. Établissement de références

Duru, Michel; Cransac, Yves; Dalmière, A.; Rosière, Mathieu; Marion, P; Roussel, Richard

doi:10.1051/agro:19920302

Cited by 22 publications

(19 citation statements)

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“…2). Similar results were reported by Duru (1992) on permanent pastures and Salette (1990) on pure swards of perennial ryegrass (Lolium perenne L.) and tall fescue.…”

Section: Decrease In P Concentration With Shoot Biomasssupporting

confidence: 85%

“…4). Duru (1992) made a similar observation. Salette (1990), however, reported that the relationship between P and N concentrations took into account the effect of both the N deficiency and the decrease in N concentration by dilution in shoot biomass.…”

Section: Decrease In P Concentration With Shoot Biomasssupporting

confidence: 61%

“…The decrease in P and N concentrations with time or advancing maturity is well documented for many grass species including timothy (Gervais and St-Pierre 1979;Jeffrey 1988;Duru 1992;Whitehead 1995). Increasing N fertilization rates had a positive effect on P concentration, but this effect decreased with time (Table 2).…”

Section: Decrease In P and N Concentrations With Timementioning

confidence: 96%

“…Duru (1992) and Koerselman and Meulman (1996) suggested using the P:N ratio for diagnostic purposes because it eliminates the need to determine shoot biomass. It might be feasible to obtain a valid diagnostic of P and N deficiencies by only measuring P and N concentrations if we assume a negligible effect of N deficiency on the relationship between P and N concentrations.…”

Section: Implications For P and N Diagnostic In Timothymentioning

confidence: 99%

“…The possibility of using this relationship for diagnostic purposes of N deficiency is thoroughly discussed by Lemaire and Meynard (1997). Salette and Huché (1991) extended this approach to other nutrients such as P and K. Because of the similarities in the decrease in N and P concentrations with increasing shoot biomass, it was proposed to use the P:N ratio for diagnostic purposes (Salette and Huché 1991;Duru 1992;Duru and Ducrocq 1997). The use of P:N ratio to detect the nature of nutrient limitations was also proposed by Koerselman and Meuleman (1996) on natural ecosystems in the Netherlands and by Sinclair et al (1997) on cut white clover/ryegrass swards in New Zealand.…”

mentioning

confidence: 99%

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Relationship between P and N concentrations in timothy

Bélanger¹,

Richards²

1999

Can. J. Plant Sci.

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. Relationship between P and N concentrations in timothy. Can. J. Plant Sci. 79: 65-70. Tools quantifying the status of N and P in plants may help to achieve efficient management of these nutrients and to optimize crop growth and yield. The objective of this study was to establish the relationship between P and N concentrations during the regrowth of timothy (Phleum pratense L.) and, in particular, to estimate the critical P concentration required to diagnose P deficiency. The relationship between P and N concentrations was determined for timothy grown in two experiments conducted with early-and latematuring cultivars under non-limiting N conditions in spring of 1991 and 1992, and in two experiments with four rates of N fertilization conducted in the spring of 1993 and the summer of 1994. Shoot biomass and P and N concentrations were determined weekly during each regrowth cycle. The P and N concentrations decreased with time in all four experiments. The decrease in P concentration with increasing shoot biomass was generally similar to the decrease in N concentration. The relationship between P concentration and shoot biomass was not different for early-and late-maturing timothy cultivars. This relationship, however, was affected by N fertilization. For a given shoot biomass, increasing N fertilization rates increased P concentration. The relationship between P and N concentrations under non-limiting N conditions is described by a linear relationship (P = 1.46 + 0.069N, R 2 = 0.79, P < 0.001, n = 48) in which P concentration (P) and N concentration (N) are expressed in g kg -1 DM. The relationship between P and N concentrations was different under N limiting conditions. For a given N concentration, the P concentration was greater under limiting N conditions than under non-limiting N conditions. Our results show that the critical P concentration for shoot growth is a function of the N concentration in the shoot biomass and the level of N deficiency. The present study provides the relationship required to estimate the critical P concentration which is essential for quantifying levels of P deficiency in timothy, and in developing models to predict the quantity of fertilizer P needed to correct that deficiency.Key words: Phleum pratense L., timothy, nitrogen, phosphorus, grasses Bélanger, G. et Richards, J. E. 1999. Relation entre les teneurs en P et N de la fléole des prés. Can. J. Plant Sci. 79: 65-70. Le développement d'outils permettant de quantifier le statut de nutrition en N et P dans les plantes est une étape essentielle pour atteindre une gestion efficace de ces éléments nutritifs, et pour optimiser la croissance et le rendement. L'objectif de cette étude était d'établir la relation entre les teneurs en P et N au cours de repousses de fléole des prés (Phleum pratense L.), et plus particulière-ment, de déterminer la teneur critique en P laquelle pourrait être utilisée pour diagnostiquer les déficiences en P. Cette relation entre les teneurs en P et N a été développée à partir de deux expériences avec des cult...

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“…2). Similar results were reported by Duru (1992) on permanent pastures and Salette (1990) on pure swards of perennial ryegrass (Lolium perenne L.) and tall fescue.…”

Section: Decrease In P Concentration With Shoot Biomasssupporting

confidence: 85%

Section: Decrease In P Concentration With Shoot Biomasssupporting

confidence: 61%