Studies on saline soils in Khon Kaen Region, Northeast Thailand

Murase, Jun; Topark-Ngarm, Bubpha; Adachi, Tadashi; Losirikul, Manas; Kimura, Makoto

doi:10.1080/00380768.1994.10414290

Cited by 1 publication

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References 7 publications

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“…Such authors also indicate that Vertisols can produce hydromorphic conditions, especially at deeper levels; little or no oxygen can inhibit nitrifying activity. Another factor that limits nitrification is soil salinity (Murase et al ., ; Inubushi et al ., ; Rysgaard et al ., ) because microbial populations are adversely affected by large salt concentrations (Page et al ., ). Specifically, nitrifiers are especially sensitive to the osmotic stress on the microbial cell under saline conditions (Inubushi et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Ammonium accumulation in soil: the long‐term effects of tillage, rotation and N rate in a Mediterranean Vertisol

López‐Bellido

Muñoz‐Romero

Fernández‐García

et al. 2014

Soil Use and Management

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Plant nutrition requires organic nitrogen to be mineralized before roots can absorb it. A 13-year field study was conducted on typical rain-fed Mediterranean Vertisol to determine the effects of tillage system, crop rotation and N fertilizer rate on the long-term NH 4 + -N content in the soil profile (0-90 cm). The experiment was designed as a randomized complete block with a split-split plot arrangement and three replications. The main plots tested the effects from the tillage system (no-tillage and conventional tillage); the subplots tested crop rotation with 2-year rotations (wheat-wheat, wheat-fallow, wheat-chickpea, wheat-faba bean and wheat-sunflower) and the subsubplots examined the N fertilizer rate (0, 50, 100 and 150 kg N/ha). Soil NH 4 + -N content was greatest in the rainiest years and greater under the no-tillage (NT) system than the conventional tillage (CT) system (57 and 48 kg/ha, respectively). The deepest soil (30-60 and 60-90 cm) contained a greater NH 4 + -N content (21.0 and 21.4 kg/ha, respectively) than the shallowest soil (19.5 kg/ha in 0-30 cm). This observation may be related to Vertisol characteristics, especially crack formation that allows greater mineralization in the deepest layers by displacing organic matter.

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