Effects of soil composition on the relationships between soil test values for phosphorus fertilizer requirements

Soil Research ◽  
1971 ◽  
Vol 9 (1) ◽  
pp. 43 ◽  
Author(s):  
JD Colwell ◽  
JD Donnelly
Keyword(s):  
Soil Test ◽  
Soil Composition ◽  
Phosphorus Fertilizer ◽  
Test Procedures ◽  
Reactive Iron ◽  
Standard Procedures ◽  
P Fertilizer ◽  
Calibration Equations

The correlations between the P test values obtained by a series of standard procedures were found to be improved by allowing for the effects of soil composition, particularly with respect to reactive iron, aluminium, magnesium, and calcium. The high correlations thus obtained suggest that most of the P test procedures will be of about equal value for estimating P fertilizer requirements if allowance is made for the effects of variations in soil composition. They also suggest that P test calibration equations should include variables representing soil Fe, Al, Mg, or Ca, as well as the actual P test.

A comparison of soil test calibrations for the estimation of phosphorus fertilizer requirements of wheat

1970 ◽  
Vol 10 (47) ◽  
pp. 774 ◽  
Author(s):  
JD Colwell
Keyword(s):  
Sodium Bicarbonate ◽  
Sorption Capacity ◽  
New South ◽  
New South Wales ◽  
Soil Test ◽  
Phosphorus Fertilizer ◽  
P Sorption Capacity ◽  
South Wales ◽  
Ammonium Lactate ◽  
Calibration Equations

The value of a range of soil analyses as tests for the phosphorus fertilizer requirements of wheat is assessed, for northern New South Wales. The best individual analyses were the standard soil tests, P extracted by ammonium lactate (Egner), 0.5M sodium bicarbonate (Colwell), 0.01N sulphuric acid (Kerr and Von Stieglitz), and Truog's reagent, and the best calibration equation was obtained using both the ammonium lactate and sodium bicarbonate tests. Sorbed phosphate equilibrating with the phosphorus in these extract solutions, estimated by isotopic dilution, made only small contributions to test calibration equations, in the presence of other simpler P analyses. The likely effects of variation in P sorption capacity were represented by analyses for iron and aluminium soluble in Tamm's acid oxalate reagent, but these analyses added little to the calibration equations, suggesting that P sorption capacity is not an important variable affecting wheat production in northern New South Wales. Analyses of variance on the yield data demonstrate the importance of experimental error in field experiments as a factor limiting the precision of soil test calibrations.

Soil and tissue tests to predict pasture yield responses to applications of potassium fertiliser in high-rainfall areas of south-western Australia

2002 ◽  
Vol 42 (2) ◽  
pp. 149 ◽  
Author(s):  
M. D. A. Bolland ◽  
W. J. Cox ◽  
B. J. Codling
Keyword(s):  
Western Australia ◽  
Field Experiments ◽  
Relative Yield ◽  
Subterranean Clover ◽  
Test Method ◽  
Yield Response ◽  
Soil Test ◽  
Test Procedures ◽  
Pasture Production ◽  
Yield Responses

Dairy and beef pastures in the high (>800 mm annual average) rainfall areas of south-western Australia, based on subterranean clover (Trifolium subterraneum) and annual ryegrass (Lolium rigidum), grow on acidic to neutral deep (>40 cm) sands, up to 40 cm sand over loam or clay, or where loam or clay occur at the surface. Potassium deficiency is common, particularly for the sandy soils, requiring regular applications of fertiliser potassium for profitable pasture production. A large study was undertaken to assess 6 soil-test procedures, and tissue testing of dried herbage, as predictors of when fertiliser potassium was required for these pastures. The 100 field experiments, each conducted for 1 year, measured dried-herbage production separately for clover and ryegrass in response to applied fertiliser potassium (potassium chloride). Significant (P<0.05) increases in yield to applied potassium (yield response) were obtained in 42 experiments for clover and 6 experiments for ryegrass, indicating that grass roots were more able to access potassium from the soil than clover roots. When percentage of the maximum (relative) yield was related to soil-test potassium values for the top 10 cm of soil, the best relationships were obtained for the exchangeable (1 mol/L NH4Cl) and Colwell (0.5 mol/L NaHCO3-extracted) soil-test procedures for potassium. Both procedures accounted for about 42% of the variation for clover, 15% for ryegrass, and 32% for clover + grass. The Colwell procedure for the top 10 cm of soil is now the standard soil-test method for potassium used in Western Australia. No increases in clover yields to applied potassium were obtained for Colwell potassium at >100 mg/kg soil. There was always a clover-yield increase to applied potassium for Colwell potassium at <30 mg/kg soil. Corresponding potassium concentrations for ryegrass were >50 and <30 mg/kg soil. At potassium concentrations 30–100 mg/kg soil for clover and 30–50 mg/kg soil for ryegrass, the Colwell procedure did not reliably predict yield response, because from nil to large yield responses to applied potassium occurred. The Colwell procedure appears to extract the most labile potassium in the soil, including soluble potassium in soil solution and potassium balancing negative charge sites on soil constituents. In some soils, Colwell potassium was low indicating deficiency, yet plant roots may have accessed potassum deeper in the soil profile. Where the Colwell procedure does not reliably predict soil potassium status, tissue testing may help. The relationship between relative yield and tissue-test potassium varied markedly for different harvests in each year of the experiments, and for different experiments. For clover, the concentration of potassium in dried herbage that was related to 90% of the maximum, potassium non-limiting yield (critical potassium) was at the concentration of about 15 g/kg dried herbage for plants up to 8 weeks old, and at <10 g/kg dried herbage for plants older than 10–12 weeks. For ryegrass, there were insufficient data to provide reliable estimates of critical potassium.

Relationship of soil phosphorus fractions to phosphorus soil tests and fertilizer response

2003 ◽  
Vol 83 (4) ◽  
pp. 443-449 ◽  
Author(s):  
R. H. McKenzie ◽  
E. Bremer
Keyword(s):  
Available P ◽  
Soil Test ◽  
Strongly Correlated ◽  
P Fractions ◽  
Soil Tests ◽  
Fertilizer Response ◽  
Inorganic P ◽  
Soil P ◽  
P Fertilizer ◽  
Soil Test P

Soil tests for available P may not be accurate because they do not measure the appropriate P fraction in soil. A sequential extraction technique (modified Hedley method) was used to determine if soil test P methods were accurately assessing available pools and if predictions of fertilizer response could be improved by the inclusion of other soil P fractions. A total of 145 soils were analyzed from field P fertilizer experiments conducted across Alberta from 1991 to 1993. Inorganic P (Pi) removed by extraction with an anion-exchange resin (resin P) was highly correlated with the Olsen and Kelowna-type soil test P methods and had a similar relationship with P fertilizer response. No appreciable improvement in the fit of available P with P fertilizer response was achieved by including any of the less available P fractions in the regression of P fertilizer response with available P. Little Pi was extractable in alkaline solutions (bicarbonate and NaOH), particularly in soils from the Brown and Dark Brown soil zones. Alkaline fractions were the most closely related to resin P, but the relationship depended on soil zone. Inorganic P extractable in dilute HCl was most strongly correlated with soil pH, reflecting accumulation in calcareous soils, while Pi extractable in concentrated acids (HCl and H2SO4) was most strongly correlated with clay concentration. A positive but weak relationship as observed between these fractions and resin P. Complete fractionation of soil P confirmed that soil test P methods were assessing exchangeable, plant-available P. Key words: Hedley phosphorus fractionation, resin, Olsen, Kelowna

scholarly journals Impact of Energy Dependence on Ground Level and Avionic SEE Rate Prediction When Applying Standard Test Procedures

Aerospace ◽  
2019 ◽  
Vol 6 (11) ◽  
pp. 119
Author(s):  
Matteo Cecchetto ◽  
Rubén García Alía ◽  
Frédéric Wrobel
Keyword(s):  
Cross Sections ◽  
Random Access ◽  
Ground Level ◽  
High Energy ◽  
Standard Test ◽  
Fissile Material ◽  
Test Procedures ◽  
Relative Contribution ◽  
Standard Procedures ◽  
Commercial Flight

Single event effects (SEEs) in ground level and avionic applications are mainly induced by neutrons and protons, of which the relative contribution of the latter is larger with increasing altitude. Currently, there are two main applicable standards—JEDEC JESD89A for ground level and IEC 62396 for avionics—that address the procedure for testing and qualifying electronics for these environments. In this work, we extracted terrestrial spectra at different altitudes from simulations and compared them with data available from the standards. Second, we computed the SEE rate using different approaches for three static random access memory (SRAM) types, which present a strong SEE response dependence with energy. Due to the presence of tungsten, a fissile material when interacting with high energy hadrons, the neutron and proton SEE cross sections do not saturate after 200 MeV, but still increase up to several GeV. For these memories, we found standard procedures could underestimate the SEE rate by a factor of up to 4-even in ground level applications—and up to 12 times at 12 km. Moreover, for such memories, the contribution from high energy protons is able to play a significant role, comparable to that of neutrons, even at commercial flight altitudes, and greater at higher altitudes.

Yield benefit of phosphorus fertilizer for wheat, barley and canola in Alberta

2003 ◽  
Vol 83 (4) ◽  
pp. 431-441 ◽  
Author(s):  
R. H. McKenzie ◽  
E. Bremer ◽  
L. Kryzanowski ◽  
A. B. Middleton ◽  
E. D. Solberg ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Brassica Napus ◽  
Hordeum Vulgare ◽  
Soil Types ◽  
Yield Response ◽  
Soil Test ◽  
Fertilizer Response ◽  
Wide Range ◽  
P Fertilizer ◽  
Soil Test P

Crop responsiveness to P fertilizers on the Canadian Prairies has likely declined during the past three to four decades due to regular application of P fertilizer and reduced tillage. Its relationship to extractable soil P as determined by various soil tests may also have changed. The objective of this study was to evaluate five soil test P methods for three major crops across a wide range of soil types and environmental conditions. Small-plot P fertilizer trials were conducted at 154 locations across Alberta from 1991 through 1993. At each location, fertilizer responses were determined for one, two, or three crops: barley (Hordeum vulgare L.), spring wheat (Triticum aestivum L.) or canola (Brassica napus L.). Fertilizer treatments consisted of seed-placed monoammonium phosphate at rates of 0, 6.5, 13.1 and 19.6 kg P ha-1. The average increase in seed yield due to application of P fertilizer was 10%, with little difference among crop types. Relative yield increases were significantly greater in Gray soils (Dark Gray Chernozemics, Dark Gray-Gray Luvisols) than in Black (Black Chernozemics) or Brown soi ls (Brown and Dark Brown Chernozemics). The maximum variation in P fertilizer response accounted for by any soil test P was 27% for barley, 15% for wheat and 7% for canola. The Kelowna method and its derivatives generally provided the best fit with P fertilizer response. Only a modest increase in the proportion of variation that could be accounted for by soil test was achieved by multiple regressions with soil pH, clay or organic matter or by separate analyses of different soil types or years. The probability of a profitable yield response due to P fertilizer application did decline with increasing soil test P. However, profitable yield responses were frequent at all levels of soil test P for the first increment of 6.5 kg P ha-1 and low at all levels of soil test P for the third increment of 6.5 kg P ha-1 (19.6 kg P ha-1). The poor relationship of soil test P to fertilizer response was attributed to frequent but variable starter effects of P fertilizer and the infrequent occurrence of highly responsive sites. Key words: Soil testing, Olsen, Bray, Kelowna, fertilizer response functions, Hordeum vulgare, Triticum aestivum, Brassica napus

scholarly journals RESPON PERTUMBUHAN DAN HASIL TANAMAN KACANG KEDELAI TERHADAP DOSIS PUPUK FOSFOR DAN VARIETAS YANG BERBEDA

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Aditya Murtilaksono ◽  
Mardhiana Mardhiana ◽  
Made Emilius Adhi
Keyword(s):  
Glycine Max ◽  
Seed Weight ◽  
Fertilizer Application ◽  
Soy Sauce ◽  
Growth And Yield ◽  
Phosphorus Fertilizer ◽  
Plant Seed ◽  
Food Ingredients ◽  
North Borneo ◽  
P Fertilizer

Glycine max is a plant that can be used as a variety of food ingredients, such as tofu, tempeh, soy sauce. Glycine max production in North Kalimantan in 2017 has decreased production. One effort to increase Glycine max production is to use phosphorus fertilizer. Phosphorus fertilizer has the function of stimulating root growth especially at the beginning of growth, accelerating flowering, ripening of seeds and fruit. Therefore it is necessary to fertilize to increase Glycine max production. The purpose of this study was to determine the response of growth and yield of Glycine max plants to the dose of phosphorus fertilizer (p) and different varieties to determine the effect of the interaction between the dose of fertilizer with Glycine max varieties.This study used a factorial randomized block design with 8 treatments, 4 replications to produce 32 treatment units. The first factor is the dose of phosphorus fertilizer consisting of without using P fertilizer (P0), P fertilizer application 0.138 g per plant (P1), P fertilizer application 0.276 g per plant (P2), and P fertilizer application 0.552 g per plant (P3) . The second factor is Glycine max varieties consisting of Devon 1 varieties (V1) and Dena 1 varieties (V2). Analysis of data using variance with 95% confidence level and if significantly different, continued with DMRT test. The results obtained are that the dose of phosphorus fertilizer cannot affect the growth and yield of Glycine max plants in Dena 1 and Devon varieties 1. The use of Dena 1 varieties has a significant effect on the growth and yield of Glycine max plants in the treatment of plant height 3 mst (34.46 cm), 4 mst (46.35 cm), 5 mst (96.76 cm), main stem diameter 2 mst (0.33 cm) and plant seed weight (6.89 grams) and seed weight per hectare (1.1 tons / ha) . There was no interaction with the dose of phosphorus fertilizer and the use of varieties on the growth and yield of Glycine max plants in Dena 1 and Devon 1 varieties. Key words: Fertilizer, Phosphorus, Glycine max, North Borneo Kedelai merupakan tanaman yang dapat dijadikan berbagai macam bahan makanan, contohnya seperti tahu, tempe, kecap. Produksi kedelai di Kalimantan Utara tahun 2017 mengalami penurunan produksi. Salah satu upaya untuk meningkatkan produksi kedelai adalah menggunakan pupuk fosfor. Pupuk fosfor memiliki fungsi Merangsang pertumbuhan akar terutama pada awal-awal pertumbuhan, mempercepat pembungaan, pemasakan biji dan buah.oleh sebab itu perlu dilakukan pemupukan untuk meningkatkan produksi kedelai. Tujuan penelitian  ini adalah Mengetahui Respon pertumbuhan dan hasil tanaman kacang kedelai terhadap dosis pupuk fosfor (p) dan varietas yang berbeda mengetahui pengaruh interaksi antara dosis pupuk dengan varietas kacang kedelai. Penelitian ini mengunakan Rancangan Acak Kelompok Faktorial dengan 8 perlakuan, 4 ulangan sehingga menghasilkan 32 unit perlakuan. Faktor pertama yaitu dosis pupuk fosfor yang terdiri dari tanpa menggunakan pupuk P (P0), pemberian pupuk P 0,138 g per tanaman (P1), pemberian pupuk P 0,276 g per tanaman (P2), dan  pemberian pupuk P 0,552 g per tanaman (P3). Faktor kedua yaitu varietas tanaman kedelai yang terdiri dari varietas Devon 1 (V1) dan varietas Dena 1 (V2). Analisis data menggunakan sidik ragam dengan tingkat kepercayaan 95% dan apabila berbeda nyata dilanjut dengan uji lanjut DMRT. Hasil penelitian yang diperoleh adalah Pemberian  dosis pupuk fosfor tidak dapat mempengaruhi pertumbuhan dan hasil tanaman kedelai varietas  Dena 1 dan Devon 1. Penggunaan varietas Dena 1 berpengaruh nyata terhadap pertumbuhan dan hasil tanaman kedelai pada perlakukan tinggi tanaman 3 mst (34,46 cm), 4 mst (46,35 cm), 5 mst (96,76 cm), diameter batang utama 2 mst (0,33 cm) dan  berat biji  pertanaman (6,89 gram) dan berat biji perhektar (1,1 ton/ha). Tidak terjadi interaksi pada pemberian dosis pupuk fosfor dan penggunaan varietas terhadap pertumbuhan dan hasil tanaman kedelai varietas Dena 1 dan Devon 1. Kata Kunci: Pupuk, Fosfor, Kedelai (Glycine max), Kalimantan Utara

Effect of Phosphorus Soil Test Level on Sorghum‐Sudangrass Response to Phosphorus Fertilizer

1997 ◽  
Vol 89 (1) ◽  
pp. 9-16
Author(s):  
James W. Bauder ◽  
Shaukat Mahmood ◽  
Bernard E. Schaff ◽  
David J. Sieler ◽  
Jeffrey S. Jacobsen ◽  
...  
Keyword(s):  
Soil Test ◽  
Phosphorus Fertilizer ◽  
Sorghum Sudangrass ◽  
Test Level
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