| The dynamics of ammonia volatilization in winter wheat field with furrow planting system and ridge with plastic film mulching |
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| DOI：10.7606/j.issn.1000-7601.2011.05.29 |
| Key Words: ammonia volatilization nitrogen FPRFM winter wheat |
| Author Name | Affiliation | | SHANGGUAN Yuxian | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | SHI Ripeng | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | HAN Kun | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Linquan | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To study the effects of furrow planting system and ridge with plastic film mulching (FPRFM) on soil ammonia volatilization in winter wheat field, the trial was conducted in October of 2009～June of 2010. A labo
ratory simulation experiment was also made to investigate the effects of plastic film mulching and deep application of N on ammonia volatilization. The ammonia was collected with airproof chambers made with PVC in filed. NH3 was absorbed by boric acid (concentration 2%) loaded in culture dish in the chambers, and then titrated with dilution H2SO4 in the lab. The volatilization amount in the
plots with FPRFM under the N application rate 180 kg/hm2 (RM180) and 240 kg/hm2 (RM240) were 1.9±0.2 kg N/hm2 and 2.4±0.7 kg N/hm2 separately, and the amount of conventional practice with nitrogen application rate 180 kg/hm2 (
FP180) was 4.3±0.8 kg N/hm2. Compared to the conventional flat planting (FP) system, the FPRFM could reduce volatilization amount by 56.3% and 43%, and N loss rate dropped from 1.6% of conventional practice to 0.2%～0.4% of FPRFM. It was implied that soil ammonia volatilization mainly occurred in the first month after seeding, and had a great drop after turning green stage. The simulation results indicated that ammonia accumulation loss complied with Elovich dynamic equation before the winter, and linear equation after turning green stage. Laboratory simulation experiment showed that deep application of N fertilizer had more effects than plastic film mulch on limiting ammonia volatilization. |
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