| Summary: | 碩士 === 國立屏東科技大學 === 土壤與水工程國際碩士學位學程 === 106 === Decreasing water input and Carbone Dioxide (CO2) emissions while maintaining grain yield remain a challenge for World to produce rice sustainably. In recent years, the Alternate Wetting and Drying technology (AWD) has been developed toward Asian’ farmers. However, the gap observed is the lack of assessment of its performances, particularly in Taiwan.
The aim of this study is to determine whether the AWD regime, when applied on System of Rice Intensification (SRI), could maintain grain yield with reduced water input and mitigation of CO2 gases.
SRI approach experiment field was conducted in National Pingtung University, Southern Taiwan. A rice seedling, TAINAN 11 (TN11) was arranged in a randomized complete block design with five water treatments: SRI2cm, SRI3cm, SRI3cm/w, SRI4cm and SRI5cm with respectively 2cm and 3 cm water depth monitoring by soil airlines cracks; 3cm, 4 cm and 5cm weekly irrigation. The irrigation regimes were done by AWD technics. The plant water status was assessed through the leaf water potential and the CO2 emission monitored at 7-day intervals. Crop growth, grain yield and water productivity were measured.
The results showed that grain yields under SRI3cm, SRI2cm and SRI3cm/w presented the high yield; SRI4cm and SRI5cm despite the high-water depth presented low yield with respectively 3080 Kg/ha and 2604 Kg/ha.
The CO2 emission under SRI3cm was lowest than SRI3cm/w and SRI2cm. SRI4 and SRI5cm presented the same range of CO2 emission with 319 ppm. A negative correlation was observed between CO2 and LAI.
The results confirmed also that SRI3cm and SRI3cm/w could obtain comparable grain yield close to farmers practices with fewer irrigations. These findings suggested that the SRI with 3 cm water depth (SRI3cm and SRI3cm/w) could be used for water-saving and greenhouse gases mitigation while maintaining grain yield in SRI production.
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