Studies on the shifts in weed vegetation in the maturation process of farms. 9. Effect of the application of Soilac, a soil conditioning material, on the weed vegetation

Sugawara, S.

Weed Research, Japan 24(3): 188-193


Accession: 000991859

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Wild-type weeds grew in the year of application of Soilac to an old volanic ash soil but, 2-6 years after application, ruderal and farm weeds were growing together. Soilac rates up to 1 t/ha had little effect on weeds whereas 2-4 t/ha considerably increased weed populations and total weights. Rates of 2-4 t/ha reduced soil hardness and increased aggregation. The critical values at which weed populations increased were at soil hardness figures below about 2 kg/cm2 and at particle aggregation (> 0.5mm diam.) increases of about 3-5.5% for intact soils and 2.5-5.75% for air-dry soils. Soilac effects with applications of 2-4 t/ha lasted 3-5 years, with even incorporation to a depth of 28 cm.