The influence of sampling intensity, liming, P rate and method of P application on P soil test values

Autor:	D. C. Peek, D. A. Horneck, J. M. Hart
Rok vydání:	1990
Předmět:	Perennial plant Soil test biology Chemistry Phosphorus Soil Science chemistry.chemical_element Sampling (statistics) Sampling error biology.organism_classification Lolium perenne Intensity (physics) Animal science Agronomy Soil pH Agronomy and Crop Science
Zdroj:	Communications in Soil Science and Plant Analysis. 21:1079-1090
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629009368291
Popis:	A four year study was planned and initiated in the fall of 1988 on a soil (Typic Pelloxerert) with a Bray‐Kurtz P1 of 8 mg/kg and a 2:1 water:soil pH of 5.2. Perennial ryegrass (Lolium Perenne L.) was seeded in 30.4 cm rows with P surface banded and broadcast at four rates (0, 26.5, 53 and 79.5 kg/ha) on limed (4.5 t/ha) and unlimed plots. Each plot was sampled at four intensities; 5, 10, 20 and 40 cores to a 0 to 15 cm depth. An additional sample from 0 to 2.5 cm was obtained for the 40 core intensity. A 6.1 m by 2.4 m area with lines every 30.4 cm was delineated and superimposed on each plot. For each plot the same spot for the 5, 10, 20 and 40 intensities were used and samples analyzed for P and pH. Where P was banded, an additional sample was taken with 50% of the cores in the band. No discernible differences were measured between banded and broadcast P in sampling error or P means. Sampling intensity had no effect on sampling error. Liming decreased both Olsen and Bray‐Kurtz P1, with Olsen P...
Databáze:	OpenAIRE
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