Abstract:
Tomato was selected as the research object.The closed gas collection method was used to monitor the ammonia volatilization of each fertilization scheme in the field.The ammonia volatilization rate, accumulation of facility vegetable soil and tomato yield under different fertilization schemes were studied, in order to effectively reduce soil ammonia volatilization, improve tomato yield and rational fertilization.The results showed that the cumulative amount of ammonia volatilization during tomato growth period under different fertilization treatments was as follows, CK>T3>T6>T1>T2>T5>T4.Among them, the lowest cumulative amount of ammonia volatilization of T4 was 4.29 kg·hm
-2,which was 27.78% lower than that of CK.The cumulative amount of ammonia volatilization of T5,T2,T1,T6 and T3 were 25.93%,23.10%,22.63%,19.04%,12.08% lower than CK,respectively.The cumulative amount of ammonia volatilization within 7 days of basal fertilizer and second top-dressing application accounted for 54.47%-66.18% of the total ammonia volatilization during the whole growth period.The amount of fertilizer and temperature may be the main reasons affecting ammonia volatilization.The yield of tomato was T6>T2>T5>T3>CK>T1>T4.The yield of T6 was as high as 88 204.04 kg·hm
-2,which was 38.84% higher than that of CK,and the cumulative amount of ammonia volatilization was small.Comprehensive tomato production and environmental benefits, the recommended fertilization program for facility tomato in this area was T2,T3,T5,T6.Through reducing the application of chemical fertilizer and the rational application of organic fertilizer or microbial fertilizers or water-soluble fertilizers in tomato production in greenhouse, the soil ammonia volatilization could be significantly reduced, and the yield could be increased, the cost of fertilization would be saved.