The application of urea phosphate, urea nitrate and thoiurea to a silty clay soil from Nile Delta (pH 7.4, 1,9% CaCO3) inhibited soil urease activity if compared to urea. The nitrification process of ammonia formed from urea hydrolysis was retarded. The use of these urea derivatives eliminated nitrite accumulation and greatly retarded nitrate formation with increased recovery of urea-N throughout the experimental period. Gaseous losses of urea-N as ammonia or by denitrification were reduced. These derivatives may be much more advantageous than urea if fertilizer effeciency is to be increased. Urnwandlungen und Effekte von Harustoff-Derivaten im BodenIn Modellversuchen wurde der EinfluS von Harnstoffphosphat, Harnstoffnitrat und Thioharnstoff auf die Ureaseaktivitat, Ammoniumbildung und Nitrifikation (Nitrit-und Nitratfreisetzung) im Vergleich zu Harnstoff mit Hilfe eines Tonbodens (pH 7,4; C, = 1,9 %; CaCO3 = 1,9 %) iiber eine
The inhibitory effects of twelve metallic cations on urease activity in three soil types were evaluated. Four of these metals Cut2, Fet3, and Cot* in their sulphate forms were tested for retarding the urea hydrolysis in soils. They reduced the accumulation of N S N , nitrite and gaseous losses of ammonia between 35 and 50 %. Hemmung der Urense-Aktivitlt durch Schwermetde und ihre Wirfrung auf Stickstoff-Umsetzungen. Es wurde die Wirkung von zwolf verschiedenen Metallkationen auf die Hemmung der Urease-Aktivitat in drei Boden untersucht. Mit den Sulfaten von vier dieser Metalle -Cut2, Fe+3, Alt3 und Coc2wurden Versuche durchgefiihrt, um die Hydrolyse von Harnstoff im Boden zu verzogern. Dabei wurde die Akkumulation von Ammonium und Nitrit sowie der Verlust von gasformigem Ammoniak um 35 bis 50 % verringert. 0044-3263/85iO5104551 S 2.50/0 0 VCH Vcrlagsgesellschah rnbH. D-6940 Weinhcirn. 1985
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