Comparison of the nitrogen balance in paddy fields under conventional rice straw application versus cow dung compost application in mixed crop–livestock systems
| Autor: | Ken-ichi Kakuda, Tung Thanh Nguyen, Hiroshi Fujii, Yuka Sasaki |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Nitrogen balance business.industry Compost Soil Science 04 agricultural and veterinary sciences Plant Science Rice straw engineering.material Crop livestock 01 natural sciences Agronomy 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Environmental science Livestock business Cow dung 010606 plant biology & botany |
| DOI: | 10.6084/m9.figshare.11362424.v1 |
| Popis: | In Japan, rice straw (RS) is commonly incorporated into the soil after harvest to maintain the fertility of paddy soil. However, in mixed crop–livestock systems, RS is collected to feed livestock and then cow dung compost (CDC) is applied to the fields. We found in previous research that CDC supplied more N to the fields than RS, but the soil total N and available N of fields to which CDC was applied were similar to those receiving conventional RS application. To identify the reason for this result, we investigated the N inputs (organic matter, fertilizer, N fixation), N outputs (plant N uptake, N leaching loss), and the N balance of RS application (RS treatment) and RS removal plus CDC application (CDC treatment) in 10 neighboring paddy field pairs in Mamurogawa town, Yamagata Prefecture, Japan. The N fertilizer contributed the highest percentage to total N input, followed by organic matter and N fixation. The amounts of N fertilizer and N fixation in the RS treatment were similar to those in the CDC treatment. CDC contributed significantly more N to the fields than RS, but the total N input was similar between treatments. The N output from plant N uptake and leaching loss were higher in the CDC treatment than the RS treatment, but the difference was not significant. Plant N uptake was the main N output, accounting for 98% of total N output. The N balance was positive and similar between treatments. Therefore, the non-significant differences in total N input, total N output, and N balance between treatments explain the similarity in soil total N and available N. |
| Databáze: | OpenAIRE |
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