| Effect of coupled irrigation and nitrogen on growth and nitrogen use efficiency of rapeseed |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2019.06.29 |
| Key Words: rapeseed irrigation and nitrogen coupling growth traits nitrogen uptake nitrogen use efficiency |
| Author Name | Affiliation | | ZHANG Sai | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400716, China | | WANG Longchang | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400716, China | | CHEN Jiao | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400716, China | | SHI Chao | College of Agronomy and Biotechnology, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400716, China |
|
| Hits: 740 |
| Download times: 502 |
| Abstract: |
| In main rapeseed growing regions, the effects of different water management and nitrogen (N) application on growth and N utilization of brassica napus was studied in order to provide theoretical basis for scientific fertilization of rapeseed for high yield and efficiency. A pot experiment on coupled effect of water and fertilizer of rapeseed in solar greenhouse of Southwest University in Chongqing in 2015-2017. The yield, growth characters, N uptake, and N utilization of rapeseed were compared with treatments of three water and three N fertilizer levels. The results showed that the plant height, stem thickness, leaf number, and effective branching number were not sensitive to moisture factors, but were significantly affected by N. When soil moisture reached a high level of 90% of field water capacity, nitrogen only affected the characteristics of root morphology and the quality of root. The more N applied, the more aboveground and underground dry matter accumulated in a certain range, but after the application of a certain amount of N fertilizer these indicators showed a decrease. The effects of water and nitrogen on the total N content of soil was not significant. The N content of crops increased with the increase in nitrogen application, but decreased with the increase in soil water content. The yield of Brassica napus showed no significant difference with different N application levels, and increased with the increase of soil water content. The apparent utilization rate of N fertilizer, partial productivity of N fertilizer, agronomic efficiency of N fertilizer, and physiological utilization of N fertilizer increased with the decrease in N application, and with the increase in soil water content at the same N application level. In this study, the optimal combination of water and N was W1N3: the irrigation level controlled 90 % of the water in the field and the N application rate was 0.12 g· kg-1. |
|
|
|