دور المستخلصات المائية لبعض النباتات في خفض كمية الامونيا المتطايرة من سماد اليوريا

Abstract EN

A laboratory experiment was carried out to study the effect of aqueous extracts of myrtus leaves, eucalyptus leaves, bermudagrass rhizomes and date palm fiber on ammonia volatilization from urea.

Studied plant materials were collected from Basrah province, south of Iraq.

Aqueous extracts of tested materials were prepared at a ratio of 1:10 (plant material : water) and added at a concentration of 0.1 ml / gm soil (for myrtus and eucalyptus leaves) and at a concentration of 0.2 ml / gm soil (for bermud agrass rhizomes and date palm fiber) to 150 gm air dried soil treated with urea at levels of 110, 330 or 1000 mg N / Kg soil and compared with ammonium thiosulfate (ATS) as a chemical urease inhibitor added at a concentration of 10 % of urea.

The experiment was carried out under a close system using soil – air chamber for 40 days (960 hours), and evoluted ammonia was recorded after 1, 10, 50, 100, 500 and 960 hours.

Results indicated that aqueous extracts of myrtus leaves or date palm fiber significantly reduced, while aqueous extracts of eucalyptus leaves or bermudagrass rhizomes did not significantly affect ammonia volatilization compared with control treatment (without inhibitor).

Data also revealed that ammonia volatilization from urea treated with aqueous extracts of myrtus leaves and date palm fiber was significantly lower than from urea treated with ATS.

These results suggested a possibility of using these extracts as potent substitute of ATS to reduce ammonia volatilization from urea.