Soil structure variations under different anthropogenic activity
2005
Ozeraitiene, D., Lithuanian Inst. of Agriculture, Klaipeda reg. (Lithuania). Vezaiciai Branch
The paper presents the results of investigations, which were performed in the Vezaiciai branch of the Lithuanian Agriculture institute in 1996-2002. The effect of different anthropogenic activities: long term liming (at a rate 0.5 every 7 years, 1.0 and 2.0 rates every 3-4 years), fertilizing with different organic materials (manure, straw and green manure) and different tillage implements (moldboard and non-moldboard with rototiller and stubble cultivator using herbicide Roundup) on topsoil structure was investigated. The soil at the site is Dystric Albeluvisol, textural class - morain loam (clay content 12-15%). It was found that intensive periodical liming for 50 years by dust limestone at a rate 2.0 every 3-4 years on the background of primary and repeated liming by slaked lime and conventional tillage did not give any significant positive effect on the soil structure. The largest amount (54-59%) of meso-aggregates (5-0.25 mm) and water stable aggregates (greater than 0.25 mm) - 66% was obtained in the soil after introduction of manure and grain straw. Soil tillage, especially moldboard had a negative effect on morain loam soil structure. From the viewpoint of morain loam soil structure preservation or improvement this management system: incorporation of manure or straw +optimal liming + non-moldboard tillage could be in use.
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