Effect of improved fallow on crop productivity, soil fertility and climate-forcing gas emissions in semi-arid conditions |
| |
| Authors: | Nicola M Hall Bocary Kaya Jan Dick Ute Skiba Amadou Niang Ramadjita Tabo |
| |
| Institution: | (1) Centre for Ecology and Hydrology Edinburgh, Bush Estate, Penicuik, Midlothian, EH26 0QB, UK;(2) The World Agroforestry Centre, ICRAF Sahel Program, P.O. Box 320, Bamako, Mali;(3) International Crops Research Institute for the Semi Arid Tropics, ICRISAT Niamey, P.O. Box 12404, Niamey, Niger |
| |
| Abstract: | The impacts of fallow on soil fertility, crop production and climate-forcing gas emissions were determined in two contrasting
legumes, Gliricidia sepium and Acacia colei, in comparison with traditional unamended fallow and continuous cultivation systems. After 2 years, the amount of foliar
material produced did not differ between the two improved fallow species; however, grain yield was significantly elevated
by 55% in the first and second cropping season after G. sepium compared with traditional fallow. By contrast, relative to the unamended fallow, a drop in grain yield was observed in the
first cropping season after A. colei, followed by no improvement in the second. G. sepium had higher foliar N, K and Mg, while A. colei had lower foliar N but higher lignin and polyphenols. In the third year after fallow improvement, a simulated rainfall experiment
was performed on soils to compare efflux of N2O and CO2. Improved fallow effects on soil nutrient composition and microbial activity were demonstrated through elevated N2O and CO2 efflux from soils in G. sepium fallows compared with other treatments. N2O emissions were around six times higher from this nitrogen-fixing soil treatment, evolving 69.9 ngN2O–N g−1soil h−1 after a simulated rainfall event, compared with only 8.5 and 4.8 ngN2O–N g−1soil h−1 from soil under traditional fallow and continuous cultivation, respectively. The findings indicate that selection of improved
fallows for short-term fertility enhancement has implications for regional N2O emissions for dry land regions. |
| |
| Keywords: | Improved fallow Crop yield Foliar composition Nitrous oxide |
| 本文献已被 SpringerLink 等数据库收录！ |
|
