Die Wirkung der Phosphorsäure in statischen P-Steigerungs-versuchen und der Verbleib der Restphosphorsäure im Boden

Bergmann, Werner; Witter, Bodo

doi:10.1080/03650346509412979

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Values of K (DL) are equal to K (CAL), and test values are given here as K (CAL). For P, the CAL method was used in most of the studies, whereas the DL method was used in the studies of Bergmann and Witter (1965), Finger (1965), and Wulff (1996. Values of P (DL) in these cases were converted to P (CAL) by multiplying the P (DL) value by 0.833 (Hoffmann, 1991).…”

Section: Field Fertilization Trialsmentioning

confidence: 99%

Re‐visiting potassium‐ and phosphate‐fertilizer responses in field experiments and soil‐test interpretations by means of data mining

Kuchenbuch

Buczko

2011

Z. Pflanzenernähr. Bodenk.

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Currently, potassium (K)‐ and phosphate (P)‐fertilizer recommendation in Germany is based on standardized soil‐testing procedures, the results of which are interpreted in terms of nutrient availability. Although site‐specific soil and plant properties (e.g., clay and carbon content, pH, crop species) influence the relation between soil nutrient content and fertilizer effectiveness, most of these factors are not accounted for quantitatively when assessing fertilizer demand. Recent re‐evaluations of field observations suggest that even for soil nutrient contents well within the range considered to indicate P or K deficiency, fertilizer applications often resulted in no yield increase. In this study, results from P‐ and K‐fertilization trials (in total about 9000 experimental harvests) conducted during the past decades in Germany and Austria were re‐analyzed using a nonparametric data‐mining procedure which consists of a successive segmentation of the data pool in order to elaborate a modified recommendation scheme. In addition to soil nutrient content, fertilizer‐application rates, nutrient‐use efficiency, and site properties such as pH, clay content, and soil organic matter, have a distinct influence on yield increase compared to an unfertilized control. For K, nutrient‐use efficiency had the largest influence, followed by soil‐test K content, whereas for P, the influence of soil‐test P content was largest, followed by pH and clay content. The results may be used in a novel approach to predict the probability of yield increase for a specified combination of crop species, fertilizer‐application rate, and site‐specific data.

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Section: Field Fertilization Trialsmentioning

confidence: 99%

Re‐visiting potassium‐ and phosphate‐fertilizer responses in field experiments and soil‐test interpretations by means of data mining

Kuchenbuch

Buczko

2011

Z. Pflanzenernähr. Bodenk.

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“…Empirical assessments are based consistently on differential trials Fig. 4 Changes in the concentration of double-lactate-soluble P in the surface soil during a 9-year field trial with increasing P fertilization using super-phosphate (extracted from Bergmann and Witter 1965) because of the lack of stable isotopes other than the natural isotope 31 P, or alternatively radioactive isotopes with a long half-life time. The experiments indicate constantly that about a quarter of the fertilized P has not been used by the plants.…”

Section: Empirical Methods To Determine the Fertilizer Nutrient Utilimentioning

confidence: 99%

The Enigma of Fertilizer Phosphorus Utilization

Schnug

Haneklaus

2016

Phosphorus in Agriculture: 100 % Zero

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The need for a sustainable use of the limited resource phosphorus in agriculture is generally acknowledged though scarcity is no pressing topic. There is no doubt that phosphorus losses from agricultural soils to the environment are a major contributor to eutrophication of water bodies. There is also no doubt that the excessive application of farmyard manure in the vicinity of big livestock enterprises yields an undesired accumulation of P in soils, while on numerous arable farms phosphorus mining can be observed. The premise for a sustainable P use in agriculture is a balanced P fertilization where inputs equal outputs. This chapter summarizes the chemical behavior of fertilizer-derived phosphorus in soils, and it presents a novel approach to assess the fertilizer phosphorus utilization completely and reliably as a tool to quantify the genuine phosphorus demand of agricultural crops.

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Eine ökonomische Auswertung der Ergebnisse von P-Steigerungsversuchen

Göther

1965

Archives of Agronomy and Soil Science

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Die Wirkung der Phosphorsäure in statischen P-Steigerungs-versuchen und der Verbleib der Restphosphorsäure im Boden

Cited by 3 publications

References 10 publications

Re‐visiting potassium‐ and phosphate‐fertilizer responses in field experiments and soil‐test interpretations by means of data mining

Re‐visiting potassium‐ and phosphate‐fertilizer responses in field experiments and soil‐test interpretations by means of data mining

The Enigma of Fertilizer Phosphorus Utilization

Eine ökonomische Auswertung der Ergebnisse von P-Steigerungsversuchen

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