|
| Effects of Reducing Nitrogen Application on Yield and Nitrogen Utilization Efficiency of Paddy Field in Suburb of Guangzhou |
| |
| DOI：10.16768/j.issn.1004-874X.2020.09.009 |
|
| Hits: 1672 |
| Download times: 620 |
| Abstract: |
| 【Objective】The study was conducted to explore the effects of reducing nitrogen （N） application measures on rice yield, N content in water and N application efficiency, and provide technical support and theoretical references for rice N fertilizer reduction in Guangzhou.【Method】Field experiment was carried out to analyze the effect of reduced application of slow-release nitrogen on N content in surface water, rice yield and N fertilizer utilization efficiency in the suburb of Guangzhou. Five treatments, namely, no nitrogen （CK）, conventional split fertilization （CF）, split application of slow-release fertilizer with N reduced by 25% （SFT）, one-off fertilization of slow-release fertilizer with N reduced by 25% （SFB）, and one-off fertilization of slow-release fertilizer with N reduced by 25% + organic substitution （SFB+OS）, were set.【Result】The N content in surface water after transplanting for 3 days under SFB treatment was higher than that under CF treatment, but then decreased quickly and remained at a relatively low level. The N contents in surface water under SFT treatment and SFB + OS treatment were similar with that under CF treatment after transplanting for 7 days, and then were significantly lower than that under CF treatment. The N contents of rice straw and grains under N fertilization treatments were significantly higher than that under CK treatment. Reduced N application had no obvious effect on N contents of rice straw and grains. Compared with CF treatment, different N reduction treatments had no significant effect on yields of rice grains. The agronomic efficiency, partial productivity and physiological utilization rate of N fertilizer under N reduction treatments were significantly higher than those under CF treatment, with the increased rates of 35.16%, 33.58% and 16.84%, respectively,
among which the maximum increased rate was obtained under SFB+OS treatment.【Conclusion】SFT and SFB+OS treatments could improve the N utilization efficiency and reduce the risk of nitrogen loss on the premise of ensuring rice yield （especially for SFB+OS treatment）, which were the effective technical measures for rice N fertilizer reduction in the suburb of Guangzhou. |
|
View Full Text
View/Add Comment Download reader |
|
|
|
