Study On The Volatilization Difference Of Ammonia From Latosols With Different Soil PH And Different Soil Water Content

In order to find out the behaviors of volatilization of ammonia after nitrogen fertilizer was applied in soils under the tropical climate, and offer theoretic basis for adequately applying nitrogen fertilizer, reduce losses of nitrogen, enhance the utilization ratio of nitrogen fertilizer, protect the environment, the ordinary fertilizer-N experiments were carried out to study the behaviors of urea at different volatilization of ammonia rate with different soil pH and the soil water content. The main results are as follows:1. In experimental scope, along with the soil pH rise, the quantity of volatilization of ammonia increases in latosol soils with same soil water content.2. The loss quantities of ammonia volatility has first increase along with the soil water content increase in three latosol soils with different matrixes, when the soil water content achieved a definite value, The loss quantities of ammonia volatility to loss achieves the maximum, after surpasses this soil water content, the quantity of ammonia volatility to loss reduces along with the soil water content increase. In latosol from purple arenaceous shale, the loss quantities of ammonia volatility of urea increase along with the soil water content increase when the soil water content is 5%~20%. The soil water content by 20% continues increases to 35%, the loss quantities of ammonia volatility reduces along with soil water content increase. The soil water content 10% is most advantageous to the loss quantities of ammonia volatility in the latosol from metamorphic rock. The quantity of volatilization of ammonia to lose is the biggest in the latosol from basalt when the soil water content is 25%. When the soil water content is 5%, the ammonia by volatilization can be test at 38th days after applies fertilizer in the latosol from basalt.3. When the soil water content is 35%, the ammonia volatility can't be happen in the latosol from basalt with soil pH 3.5, and the loss quantities of ammonia volatility is few when the soil pH is 4.0. So the soil pH 4.0 maybe is the marginal value of ammonia volatility in the latosol from basalt. Even if under the soil pH 3.5 strong acid condition, still could have the loss of ammonia to volatilize in the latosol from purple arenaceous shale.