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Source: Minamikawa and Sakai (2005).

Source: Minamikawa and Sakai (2005).

worked well, and soil Eh was almost kept between the Eh limits (Fig. 14.10a). Accordingly, CH4 flux with Eh control changed lower than that with continuous flooding (Fig. 14.10b), and the total CH4 emission resulted in significant reduction (Table 14.4). Eh control with the upper and lower limit did not decrease rice yield as compared to continuous flooding (Table 14.4). However, Eh control did not increase rice yield with the mid-season drainage and intermittent irrigation.

Generally, rice straw application stimulates the development of soil reductive conditions and CH4 emission. Although straw application increased the frequency of the routine, soil Eh was kept between the Eh limits as without straw application. Therefore, the total CH4 emission with straw application was as low as that without one (Table 14.4).

a) -Q- Continuous flooding -#- Eh control

Fig. 14.10 Seasonal changes in (a) soil Eh and (b) CH4 flux with different kinds of water management under the straw-applied field conditions (modified from Minamikawa and Sakai 2006b). The upper and lower limit of soil Eh is +100 and -150mV, respectively. FD - final drainage a) -Q- Continuous flooding -#- Eh control

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Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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