428 PB 165 SPATIAL AND TEMPORAL VARIATION IN ORCHARD SOIL NITROGEN EXTRACTABILITY

Autor:	S. A. Weinbaum, Hilary J. Sampson
Rok vydání:	1994
Předmět:	Variation (linguistics) Agronomy Soil nitrogen Environmental science Horticulture Orchard
Zdroj:	HortScience. 29:492e-492
ISSN:	2327-9834 0018-5345
Popis:	Extractable soil N may be leached below the plant rooting zone. and into the ground water. Orchards devoid of actively growing winter cover crops are subject to the greatest risk of NO3- leaching during tree dormancy in California. We examined the patterns of KCl extractable NH4+ and NO3-. and potentially mineralizable N (PMN) in the top 10 cm of soil across transects (60 samples, 150 m) in 3 almond orchard systems at 5 phenological stages in 1993. Extractable N was affected both spatially and temporally by management practices (e.g. herbicide or fertilizer application) and soil temperature. PMN did not exhibit local spatial patterns; geostatistical analysis revealed a trend across the transects indicating a larger scale of soil variation. possibly resulting from land leveling. The conventionally-managed orchard without a cover crop demonstrated higher levels of extractable NH4+ and NO3- in the top 10 cm in Feb. and Nov. 1993, compared with orchards managed with organic fertilizers and winter cover crops.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0ae2d6ef3a0b962111375b355ced6b80 https://doi.org/10.21273/hortsci.29.5.492e Zobrazit plný text záznamu