Soil phosphorus tests and grain yield responsiveness of maize (Zea mays) on Ferrosols

Moody, P. W.; Dickson, T.; Aitken, R. L.

doi:10.1071/s96103

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…As the supply rate of P by diffusion in the soil is linked to the P intensity, the P intensity consequently governs the P uptake by the plant roots. P bioavailability may become more dependent on the capacity of the soil to buffer the P concentration in the soil solution at later stages of plant growth, and if the demand of P by the crop is large compared to the P supply capacity of the soil (Moody et al 1997). Barrow (1967) verified that a larger capacity of the soil to buffer the phosphate potential in solution led to a larger P uptake by Bromus mollis.…”

Section: Discussionmentioning

confidence: 95%

“…P uptake by plant roots depends both on the intensity and the quantity factor. However, this relationship with Q and I changes during plant growth and differs between crop species based on their P demand (Moody et al 1997). Initially, P uptake strongly depends on the P intensity, but also on the PBC, as the PBC affects the P diffusion rate in the soil.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity

et al. 2006

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Phosphorus (P) uptake by plant roots depends on P intensity (I) and P quantity (Q) in the soil. The relative importance of Q and I on P uptake is unknown for soils with large P sorption capacities because of difficulties in determining trace levels of P in the soil solution. We applied a new isotope based method to detect low P concentrations ( < 20 lg P l )1 ). The Q factor was determined by assessment of the isotopically exchangeable P in the soil (E-value) and the I factor was determined by measurement of the P concentration in the pore water. A pot trial was set up using four soils with similar labile P quantities but contrasting P buffering capacities. Soils were amended with KH 2 PO 4 at various rates and pigeon pea (Cajanus cajan L.) was grown for 25 days. The P intensity ranged between 0.0008 and 50 mg P l )1 and the P quantity ranged between 10 and 500 mg P kg )1 . Shoot dry matter (DM) yield and P uptake significantly increased with increasing P application rates in all soils. Shoot DM yield and P uptake, relative to the maximal yield or P uptake, were better correlated with the P concentration in the pore water (R 2 =0.83-0.90) than with the E-value (R 2 =0.40-0.53). The observed P uptakes were strongly correlated to values simulated using a mechanistic rhizosphere model (NST 3.0). A sensitivity analysis reveals that the effect of P intensity on the short-term P uptake by pigeon pea exceeded the effect of P quantity both at low and high P levels. However, DM yield and P uptake at a given P intensity consistently increased with increasing P buffering capacity (PBC). The experimental data showed that the intensity yielding 80% of the maximal P uptake was 4 times larger in the soil with the smallest PBC compared to the soil with the largest PBC. This study confirms that short-term P uptake by legumes is principally controlled by the P intensity in the soil, but is to a large extent also affected by the PBC of the soil.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity

et al. 2006

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“…Most authors who found good or intermediate relationships between Olsen P and plant P uptake or relative yield, carried out their experiments on a particular class of soil or on a limited number of different soils (Ahmad et al 2006;Csatho et al 2005Csatho et al , 2002Moody et al 1997;Saggar et al 1999;Sardi et al 2009;Ziadi et al 2001). It has often been noted that the relationship between Olsen P and relative yield or plant P uptake, is heavily influenced by soil type and soil pH (Delgado and Torrent 1997;Smethurst 2000).…”

Section: Use Of Dgt For the Prediction Of Plant-available Cu And Znmentioning

confidence: 99%

“…On US alkaline soils, Olsen-P is frequently used but in various parts of the country, acidic extractants such as Mehlich-1, Mehlich-3 or Bray-1 are mostly used (Bundy et al 2005). While some authors have found good relationships between bicarbonate-extracted P concentrations and the plant availability of P, their experiments were carried out on a particular class of soil or on a limited number of different soils (Ahmad et al 2006;Csatho et al 2005Csatho et al , 2002Moody et al 1997;Saggar et al 1999;Sardi et al 2009;Ziadi et al 2001). Only Mcbeath et al (2007) found a good relationship over a large number of different soils, however they only used a single rate of fertiliser and assessed P availability by dry matter response, therefore it was not possible to determine if maximum yields had been reached.…”

Section: Introductionmentioning

confidence: 99%

The use of DGT for prediction of plant available copper, zinc and phosphorus in agricultural soils

et al. 2011

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Soil chemical extractions are widely used to predict the nutritional status of soils. However, the correlation between extracted elements and plant uptake is often poor, especially if compared over a range of soil types. The aim of this study was to examine a new method called Diffusive Gradients in Thin films (DGT), which measures the diffusive supply of elements, thereby mimicking a plant root. The ability of DGT to assess plant-available P, Zn and Cu was tested in a wide range of typical Scandinavian agricultural soils along with conventional methods (EDTA and DTPA for Cu and Zn; NaHCO 3 for P and soil solution concentrations). Extracted soil concentrations were compared to that of the element in the youngest fully developed leaf of barley (Hordeum vulgare L.) grown in pots. For Zn and P, only DGT could predict plant uptake while conventional extraction methods and soil solution analyses performed poorly. All soil tests could predict Cu concentration in leaves, but the DGT technique proved to be most accurate followed by the soil solution concentration of Cu. We conclude that DGT is much more accurate at predicting plant-available P, Zn and Cu than commonly used methods for analysing plantavailable nutrients in soil.

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“…The P extracted by water, or a dilute salt solution, is readily available to plants and has been well correlated with plant P uptake (Codling et al, 2002;Schoenau and Huang, 1991;Stout et al, 2003), and grain yield (Moody et al, 1983) in some studies, though has provided a poor indication of plant uptake (Stout et al, 2003) and grain yield (Moody et al, 1997) in others. These measurements of immediatelyavailable P fail with plants having high P requirements (Ballard and Prichett, 1975).…”

Section: Introductionmentioning

confidence: 99%

Assessment of P availability in heavily fertilized soils using the diffusive gradient in thin films (DGT) technique

2005

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Phosphorus-availability tests typically provide an indication of quantity of P available (Colwell bicarbonateextractable P), or of the intensity of supply (0.01 M CaCl 2 -extractable P). The soil's capacity to buffer P is more difficult to assess, and is generally estimated using a P-adsorption curve. The diffusive gradient in thin films (DGT) approach may provide a simpler means of assessing a soil's ability to maintain soil solution P. Optimal extraction conditions were found to be 24 h exposure of DGT samplers to saturated soil. The DGT approach was evaluated on a range of 24 soils, some of which had high Colwell-(>100 µg g −1 ) and Bray 1-(>30 µg g −1 ) extractable P content, but showed a tomato (Lycopersicon esculentum Mill.) yield response to the addition of P fertilizer. The DGT approach provided an excellent separation of soils on which tomato showed a yield response, from those where fertilizer P did not increase dry-matter yield. Phosphorus accumulation was strongly correlated with soil solution P concentration and anion exchange resin-extractable P, but showed poor correlation with Colwellor Bray 1-extractable P. The DGT P accumulation rate of 3.62 × 10 −7 to 4.79 × 10 −5 mol s −1 m −3 for the soils tested was comparable to the uptake rate of roots of tomato plants that were adequately supplied with P (2.25 × 10 −5 mol s −1 m −3 ).Abbreviations: DGT -diffusive gradient in thin films; ICPAES -inductively coupled plasma atomic emission spectroscopy.

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Soil phosphorus tests and grain yield responsiveness of maize (Zea mays) on Ferrosols

Cited by 8 publications

References 9 publications

Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity

Phosphorus intensity determines short-term P uptake by pigeon pea (Cajanus cajan L.) grown in soils with differing P buffering capacity

The use of DGT for prediction of plant available copper, zinc and phosphorus in agricultural soils

Assessment of P availability in heavily fertilized soils using the diffusive gradient in thin films (DGT) technique

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