Yield‐of‐Phosphorus Curves

Liu, Dean

doi:10.2136/sssaj1954.03615995001800040027x

Cited by 32 publications

(27 citation statements)

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“…This is consistent with the fact that continued fertilizer P application fills P sorption sites, increasing the amount of available residual P. Consequently, utilization of fertilizer P decreased and A values increased annually. These results are in agreement with those of earlier studies, which indicated reduced A values with an increase in clay content and P sorption (Dean, 1954;Fried and Dean, 1952;Tahir et al, 1971;Volk and McLean, 1963).…”

Section: Resultssupporting

confidence: 93%

“…Earlier studies reported a similar A value increase,, with fertilizer P applied to wheat (Tahir et al, 1971;Terman and Khasawneh, 1968), oats (Arena sativa L.) (Bouldin and Black, 1960;Volk and McLean, 1963), sudangrass (Sorghum bicolor [L.] Moench) (Laws, 1965), and millet (Setaria italica [L.] Beauv.) (Dean, 1954) in greenhouse pot experiments. The close relationship between BP and A value confirms earlier findings that suggested the increase in A value with continued fertilizer P application was a rest~lt of an increasing contribution from residual P to plant uptake of P (Kamprath, 1967;Robertson et al, 1971;Shelton and Coleman, 1963;Tahir et al, 1971;Volk and McLean, 1963).…”

Section: Resultsmentioning

confidence: 99%

“…It was suggested that increasing A values result from the effect of residual P (Shelton and Coleman, 1968;Tahir et al, 1971) and P sorption (Dean, 1954;Volk and McLean, 1963) on the uptake and utilization of fertilizer P. Little direct information is available on the effect of changes in specific soil properties (via fertilizer P application) and soil type on A values measured in field experiments.…”

Section: Introductionmentioning

confidence: 99%

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Effect of phosphorus fertilizer on A values for soils cropped with winter wheat

Sharpley

1987

Plant Soil

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The effect of successive annual fertilizer P applications'(30 kg P ha-I yr -1) on A values (plant availability) for four soils cropped with winter wheat, was investigated over a four-year period under field conditions in the Southern Plains, USA, using P-32 as a tracer. With successive annual fertilizer P applications, winter wheat dry matter yield and A value increased. This increase was linear for wheat yield on each soil (r 2 = 0.77 to 0.97). For A value, the increase was a positive linear function of residual Bray-I P (r 2 = 0.99 to 1.00) and a negative linear function of P-sorption index of the soil (r 2 = 0.94 to 0.98). This was attributed to the fact that continued fertilizer P applications, by decreasing P-sorption index, increased amounts of available P. Consequently, utilization of fertilizer P decreased with successive applications and A value, thus, represents total soil P availability, including native and residual (carry over) fertilizer P. These results confirm earlier suggestions that the A value may be used as a quantitative measurement of environmental and soil factors influencing P availability.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of phosphorus fertilizer on A values for soils cropped with winter wheat

Sharpley

1987

Plant Soil

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“…A detailed comparison has been made of isotopic and total uptake methods for determing phosphorus derived from fertilizer applications. (62) A s long as the condition of little growth response is met, the methods agree closely. The same agreement was found for several other elements, including calcium, manganese and zinc.…”

Section: Introductionmentioning

confidence: 81%

Soil-Plant Relationships of Radioactive Elements

Rg¹

1965

Health Physics

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The plant concentration of various radioactive elements, after they have been added to soils in water-soluble forms, may be several orders of magnitude higher or lower than the concentration in the soil. Those that are most readily absorbed are soluble in the soil or are isotopic with elements that have metabolic functions in the plant. Those that are least absorbed are quite insoluble in the soil. The gamma radiation doses to plants would come predominantly from the soil, as would the beta radiation doses except for the beta radiation from those few elements which may be highly concentrated in certain plant tissues. The role of plants in movement of radionuclides in soil is minor except over very long periods of time.

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“…Estimating potential nutrient supply from nutrient response functions, nutrient utilization efficiencies and fertilizer recovery fractions It is a common practice to estimate nutrient supply capacity of the native soil by extrapolating the response curve of yield (Y-axis) vs. quantity of nutrient applied (X-axis) until it intersects with the X-axis, with the X value at zero yield representing the (negative value of the) potential of the native soil to supply that nutrient (Dean 1954). The thus obtained estimate of nutrient supply of the native soil is often called the a-value.…”

Section: Rmsementioning

confidence: 99%

Potential nutrient supply, nutrient utilization efficiencies, fertilizer recovery rates and maize yield in northern Nigeria

Tabi

Diels

Ogunkunle

et al. 2007

Nutr Cycl Agroecosyst

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Potential N (SN) and P (SP) supplies, N and P utilization efficiencies and fertilizer recovery rates for the northern Guinea Savanna (NGS) agroecological zone of Nigeria were derived from data collected on farmers' fields, and used as input in the QUantitative Evaluation of the Fertility of Tropical Soils (QUEFTS) model. The potential N supply ranged from 7 to 56 kg N ha -1 , with a mean of 25 kg N ha -1 , while SP ranged from 2 to 12 kg P ha -1 with a mean of 5 kg P ha -1 . Both SN (CV = 42%) and SP (CV = 57%) were highly variable between farmers' fields. Deriving potential nutrient supply from 'a' values gives lower estimates. The empirical equation in QUEFTS that estimates SN (SN ¼ 1:7 Â OC Â ðpH À 3Þ) sufficiently predicted the SN of soils in the NGS (RMSE = 8.0 kg N ha -1 index of agreement (IOA) = 0.81). The SP equation (SP ¼ 0:35 Â ð1 À 0:5 Â ðpH À 6Þ 2 Þ Â OC þ 0:5Â OlsenP) predicted moderately potential P supply (RMSE = 6.80 kg P ha -1 , IOA = 0.54). When N or P is maximally accumulated in the plant (i.e., least efficiently utilized), the utilization efficiency was 21 kg grain kg -1 N taken up and 97 kg grain kg -1 P taken up. When these nutrients were maximally diluted in the plant (i.e., most efficiently utilized), the utilization efficiency was 70 kg grain kg -1 N taken up and 600 kg grain kg -1 P taken up. The range in N recovery fraction (NRF) of N fertilizer applied was from 0.30 to 0.57, with a mean of 0.39, while the P recovery fraction (PRF) ranged from 0.10 to 0.66 with a mean of 0.24. Although SP was moderately predicted, when QUEFTS model input parameters were adjusted for the NGS, the model sufficiently (IOA = 0.83, RMSE = 607 kg DM ha -1 ) estimated maize grain yield in the NGS of Nigeria. The original QUEFTS model however, gave better predictions of maize grain yield as reflected by the lower RMSE (IOA = 0.84, RMSE = 549 kg DM ha -1 ). Consequently, QUEFTS is a simple and efficient tool for making yield predictions in the NGS of northern Nigeria.

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Yield‐of‐Phosphorus Curves

Cited by 32 publications

References 0 publications

Effect of phosphorus fertilizer on A values for soils cropped with winter wheat

Effect of phosphorus fertilizer on A values for soils cropped with winter wheat

Soil-Plant Relationships of Radioactive Elements

Potential nutrient supply, nutrient utilization efficiencies, fertilizer recovery rates and maize yield in northern Nigeria

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