Organic soil phosphorus considerably contributes to plant nutrition but is neglected by routine soil-testing methods

2010 ◽  
Vol 173 (5) ◽  
pp. 765-771 ◽  
Author(s):  
Diedrich Steffens ◽  
Thomas Leppin ◽  
Nora Luschin-Ebengreuth ◽  
Zhi Min Yang ◽  
Sven Schubert
Keyword(s):  
Plant Nutrition ◽  
Soil Phosphorus ◽  
Organic Soil ◽  
Soil Testing ◽  
Testing Methods

Soil Testing Methods and Apparatus Designed for Economy in Time and Labor 1

1941 ◽  
Vol 33 (7) ◽  
pp. 623-631 ◽  
Author(s):  
E. W. Constable ◽  
I. E. Miles
Keyword(s):  
Soil Testing ◽  
Testing Methods

scholarly journals Chemical Extraction of Phosphorus from Dairy Manure and Utilization of Recovered Manure Solids

Agronomy ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1725
Author(s):  
Ariel A. Szogi ◽  
Virginia H. Takata ◽  
Paul D. Shumaker
Keyword(s):  
Soil Phosphorus ◽  
Surface Water Quality ◽  
N:P Ratio ◽  
Organic Soil ◽  
Land Application ◽  
Dairy Manure ◽  
Chemical Extraction ◽  
Soil P ◽  
Solids Separation ◽  
Bedding Materials

Repeated land application of dairy manure can increase soil phosphorus above crop requirements because of manure’s low nitrogen (N) to phosphorus (P) ratio (N:P < 4:1). This soil P build-up can lead to off-site P transport and impairment of surface water quality. We evaluated a treatment process to extract P from manures, called Quick Wash, integrated with a double-stage solids separation system to recover coarse and fine manure solids. The Quick Wash process uses a combination of acid, base, and organic polymers to extract and recover P from manures, improving the N:P ratio of recovered manure solids (RMS). Results showed that coarse RMS could have use as bedding materials for dairy cows, and the fine acidified RMS with N:P > 10:1 can be used as a low-P organic soil amendment. A soil incubation test showed that acidified RMS stimulated N mineralization and nitrification having higher nitrate levels than untreated dairy slurry when incorporated into soil. Our results suggest that the inclusion of Quick Wash in a dairy manure management system can improve manure’s value, lowering costs of bedding material and manure hauling, and recover P for use as fertilizer while reducing the environmental impact of land spreading manure P.

Comparison of five soil testing methods to establish phosphorus sufficiency levels in soil fertilized with water-soluble and sparingly soluble-P sources

1991 ◽  
Vol 28 (3) ◽  
pp. 271-279 ◽  
Author(s):  
A. Bationo ◽  
W. E. Baethgen ◽  
C. B. Christianson ◽  
A. U. Mokwunye
Keyword(s):  
Water Soluble ◽  
Soil Testing ◽  
Testing Methods ◽  
Soluble P ◽  
P Sources

Standardizing Soil Testing Methods

1980 ◽  
Vol 63 (4) ◽  
pp. 763-765
Author(s):  
Wayne Sabbe
Keyword(s):  
United States ◽  
The United States ◽  
Soil Testing ◽  
Soil Test ◽  
Test Results ◽  
Testing Methods ◽  
Standard Methods ◽  
Testing Procedures ◽  
Testing Laboratories ◽  
Phosphorus And Potassium

Abstract Soil tests are performed to determine the amount of nutrients available to plants so that fertilizer and lime recommendations can be formulated. In 1951, State soil testing laboratories had numerous extractants for determining phosphorus and potassium. Twenty years later, only 3 extractants each were used for phosphorus and potassium. In the United States, a regional approach produced standardized methods for several of the most common soil testing procedures. These detailed standard methods resulted from identifying procedural causes for variations in soil test results. For example, the amount of nutrient extracted varied by size and shape of extraction vessel and speed and time of shaking. Currently, terminology and expression of soil test results, and a search for a more universal soil extractant, i.e., one that can be used to determine several rather than a single nutrient, are 2 of the main areas of effort.

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