Critical plant phosphorus for winter wheat assessed from long-term field experiments

Fontana, Mario; Bélanger, Gilles; Hirte, Juliane; Ziadi, Noura; Elfouki, Saïd; Bragazza, Luca; Liebisch, Frank; Sinaj, Sokrat

doi:10.1016/j.eja.2021.126263

Cited by 10 publications

(7 citation statements)

References 52 publications

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“…K fertilization effect on grain yield and aboveground biomass production Differences in shoot biomass and grain yield were greater among sites than among the K fertilization treatments (Tables 2 and 4), as observed for longterm experiments on P fertilization established at the same locations (Fontana et al 2021). This highlights the differences of pedo-climatic conditions across the three long-term experiments.…”

Section: Converting Soil K Extracts and K Buffer Power Across Various...supporting

confidence: 53%

“…The "classical" method, which has been widely used for establishing critical dilution curves, proceeds in two steps e.g. (Bélanger et al 2015;Cadot et al 2018;Soratto et al 2020;Fontana et al 2021): (1) the lowest non-limiting K fertilization rate for shoot biomass (4) Kc = a × SB b was identified on each sampling date in 2018 as previously described for the limiting soil K conditions and (2) the K c curve defined by Eq. ( 2) was fitted to the data of shoot biomass and K concentration for that non-limiting K fertilization rate by nonlinear least squares.…”

Section: Discussionmentioning

confidence: 99%

“…Ellighausen was also the only site where shoot biomass production was affected by K fertilization in 2018 (Table 2). As for P fertilization (Fontana et al 2021), the response to K fertilization was greater for shoot biomass production than for grain yield, suggesting that the diagnostic of K deficiency or sufficiency performed on the shoot biomass during the growing season is a good early indicator of a potential yield loss. The lack of a longterm K fertilization effect on wheat grain yield was also reported for a large array of pedoclimatic conditions (Swarup and Ghosh 1979;Swarup and Chhillar 1986;Jouany et al 1996;He et al 2012;Zhao et al 2014).…”

Section: Converting Soil K Extracts and K Buffer Power Across Various...mentioning

confidence: 99%

“…This gives a specific critical value for a given shoot biomass. For N (Greenwood et al 1990;Justes et al 1994;Colnenne et al 1998;Debaeke et al 2012) and P (Bélanger et al 2015;Cadot et al 2018;Soratto et al 2020;Fontana et al 2021), studies were carried out to develop critical dilution curves for many crop species. For K, critical dilution curves have so far only been investigated for vegetables and grasslands (Salette and Huché 1991;Greenwood and Stone 1998;Gómez et al 2019) whereas those for cereal or oilseed crops have never been investigated to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

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Long-term K fertilization effects on soil available K, grain yield, and plant K critical value in winter wheat

Fontana

Hirte

Bélanger

et al. 2022

Nutr Cycl Agroecosyst

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This study takes advantage of Swiss long-term field experiments (> 30 yrs) with different K fertilization rates at three sites to (i) test the possibility to generalize linear relationships between K extracts (ammonium acetate, K-AA; ammonium acetate EDTA, K-AAE; water, K-H2O; and water saturated with CO2, K-CO2), (ii) determine the K fertilization effect on soil exchangeable K, (iii) determine the K fertilization effect on shoot biomass and grain yield of winter wheat, (iv) analyze the possibility to derive a soil K critical value, and (v) determine a critical plant K (Kc) dilution curve as a function of shoot biomass (SB) using a “classical” and a Bayesian method. Shoot biomass during the growing season, grain yield, and four soil extracts were measured in 2018 after more than 30 years with four to five rates of K fertilization. Unpublished data of soil K-AAE concentrations, and grain yield and K concentrations since the start of the experiments were also used to analyze the relationship between soil K-AAE and the cumulative K budget. The K-AA and K-AAE concentrations can be converted from one to the other [K-AAE = 26.8 + (1.11 × K − AA)], while the relationship between K-H2O and K-CO2 depends on soil pH. The K-AAE concentrations were positively related to the cumulative K budget for K-AAE ranges from a minimal K concentration up to a K holding capacity that were specific to each site. The lack of K fertilization during several decades decreased shoot biomass in 2018 and grain yield over the course of the experiments at only one of the three sites. The K-AAE values corresponding to non-limiting soil K conditions at this site (50—75 mg K kg−1) were close to the critical values previously reported but the large range suggests that more soil parameters should be taken into account to improve the accuracy of the fertilization guidelines. The Bayesian and “classical” methods used for estimating the Kc curve yielded similar results (Kc = 58.21 × SB−0.45) that should be confirmed in future studies under a range of pedoclimatic conditions along with the effect of other nutrients and wheat cultivars.

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Section: Converting Soil K Extracts and K Buffer Power Across Various...supporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Converting Soil K Extracts and K Buffer Power Across Various...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Long-term K fertilization effects on soil available K, grain yield, and plant K critical value in winter wheat

Fontana

Hirte

Bélanger

et al. 2022

Nutr Cycl Agroecosyst

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“…Soil fertility assessments are commonly based on 'statistical correlations'-i.e., the results of the soil tests have to be correlated statistically to the results of crop responses, measured in multiple site-year field experiments [19][20][21]. This latter field testing is demanding and thereby also often an obstacle for the introduction of new, improved concepts for soil testing.…”

Section: Introductionmentioning

confidence: 99%

Empower Innovations in Routine Soil Testing

et al. 2022

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Conventional soil tests are commonly used to assess single soil characteristics. Thus, many different tests are needed for a full soil fertility/soil quality assessment, which is laborious and expensive. New broad-spectrum soil tests offer the potential to assess many soil characteristics quickly, but often face challenges with calibration, validation, and acceptance in practice. Here, we describe the results of a 20 year research program aimed at overcoming the aforementioned challenges. A three-step approach was applied: (1) selecting and establishing two contrasting rapid broad-spectrum soil tests, (2) relating the results of these new tests to the results of conventional soil tests for a wide variety of soils, and (3) validating the results of the new soil tests through field trials and communicating the results. We selected Near Infrared Spectroscopy (NIRS) and multi-nutrient 0.01 M CaCl2 extraction (1:10 soil to solution ratio; w/v) as broad-spectrum techniques. NIRS was extensively calibrated and validated for the physical, chemical, and biological characteristics of soil. The CaCl2 extraction technique was extensively calibrated and validated for ‘plant available’ nutrients, often in combination with the results of NIRS. The results indicate that the accuracy of NIRS determinations is high for SOM, clay, SOC, ECEC, Ca-CEC, N-total, sand, and inorganic-C (R2 ≥ 0.95) and good for pH, Mg-CEC, and S-total (R2 ≥ 0.90). The combination of the CaCl2 extraction technique and NIRS gave results that related well (R2 > 0.80) to the results of conventional soil tests for P, K, Mg, Na, Mn, Cu, Co, and pH. In conclusion, the three-step approach has revolutionized soil testing in The Netherlands. These two broad-spectrum soil tests have improved soil testing; have contributed to increased insights into the physical, chemical, and biological characteristics of soil; and have thereby led to more sustainable soil management and cropping systems.

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