Evaluation For High Water Productivity And Yield Assessment Of Lowland Paddy Rice Under Controlled Drainage And Irrigation Using The System Of Rice Intensification SRI

The pressure to limit water supply in irrigated agriculture while producing more food with less water is being exacerbated by population growth and climate change. Rice is a very important and valuable crop to Taiwans economy but production is being hampered by water shortage. This research was therefore conducted during the rainy season with the intent of saving irrigation and rain water while maintaining a suitable drainage depth for sustaining rice yield under SRI management. Three different drainage depths T2cm T4cm T6cm and a control Tsat was used alongside irrigation under a complete randomized block design having four replications. Results revealed water reduction after panicle initiation significantly affected plant height in T2cm and T4cm and grain yield in T2cm. The lowest grain reduction 4.92 and grain production loss 0.09 kg was produced by T4cm.The highest total water productivity 0.52kgm3 and irrigation water productivity 1.88 kgm3 was produced in T2cm followed by T4cm 0.44 kgm3 and 1.14kgm3 respectively. The draining of excess rainfall at 4cm depth and providing irrigation of the same amount provided the best results under SRI management in terms of yield and irrigation water saving.