| Autor: |
Fajri Anugroho, Makoto Kitou |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Weed Biology and Management. 11:1-6 |
| ISSN: |
1444-6162 |
| DOI: |
10.1111/j.1445-6664.2011.00398.x |
| Popis: |
Two of the many benefits of including legume cover crops in a fallow cropping system are weed suppression and increased soil organic N. This study was conducted in order to examine the effect of hairy vetch (Vicia villosa) on weed growth and soil N through a fallow period in subtropical Okinawa, Japan. Together with an untreated control plot, hairy vetch was grown from November 2007 to April 2008 and subsequently incorporated into the soil. The weeds were allowed to develop uncontrolled for 2 months until the time when a cash crop would be planted. In the period after the incorporation of hairy vetch, the weed biomass in the hairy vetch (HV)+ plot was more than threefold greater than that in the HV− plot. Hairy vetch had a high tendency to uptake N in April before the incorporation of hairy vetch; the N uptake by the weeds was lower in the HV+ plot than in the HV− plot. After the incorporation of hairy vetch, the N uptake by the weeds in the HV+ plot was two-to-six times higher than that by the weeds in the HV− plot. The C/N ratios of hairy vetch and the weeds in the HV+ plot were lower than those of the weeds in the HV− plot. More than half of the hairy vetch residue and N in the residue had decomposed by 28 days after incorporation. The content of both the NH4-N and NO3-N in the HV+ soil was higher than that in the HV− soil. Moreover, the amount of NO3-N increased during the growing period of hairy vetch and decreased after the incorporation of hairy vetch. The fallow soil into which hairy vetch had been incorporated displayed a greater weed biomass and resulted in a higher inorganic N content than the soil that had not supported hairy vetch. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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