Short-term stability of soil test phosphorus in agricultural fields

Autor:	G W Rehm, J A Lamb
Rok vydání:	2002
Předmět:	Soil test business.industry Phosphorus Soil Science chemistry.chemical_element Soil science engineering.material Soil management Animal science chemistry Agriculture Short term stability engineering Common spatial pattern Environmental science Fertilizer business
Zdroj:	Canadian Journal of Soil Science. 82:239-247
ISSN:	1918-1841 0008-4271
DOI:	10.4141/s01-031
Popis:	The spatial and temporal stability of soil test values is important to the use of soil testing for site-specific soil fertility management. A study was conducted to evaluate the spatial and temporal stability of soil test phosphorus (P). Five sites ranging in size from 3.7 to 4.4 ha were soil sampled in the same locations in a 18.3 × 18.3-m grid either three or four times over a 2-yr period. Bray 1-P values were similar or decreased over time, while Olsen-P values at two of five sites decreased. One site showed no pattern and two sites had cyclic patterns where the spring sample values were greater than the fall. The spatial pattern of soil test values during a 2 yr rotation for Bray 1-P and Olsen-P was very stable. The changes in distribution in soil test P categories over a 2-yr period resulted in a shift to lower soil test categories. The decreases in soil test P were probably caused by plant P uptake in combination with no application of P fertilizer during the study. Key words: Soil test phosphorus, spatial stability, pH, temporal stability
Databáze:	OpenAIRE
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