Document Type : Research Paper
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Abstract
Proper water management in paddy fields is the most important operations that plays a fundamental role in the usefulness of other inputs in rice cultivation. Construction of drainage systems is very essential for improving water management in paddy fields. The effect of different drainage systems including three conventional subsurface drainage systems, a bi-level subsurface drainage system, and surface drainage system on the yield of Tarom rice cultivar were compared at the improved and consolidated paddy fields of Sari Agricultural Sciences and Natural Resources University. The experiment was conducted in a randomized complete block design with 5 treatments. At the harvesting time, some crop indices such as plant height, flag leaf length, main panicle length, tillering number, number of lateral branches of the main panicle, straw yield, biological yield, grain yield, and harvest index were determined. Statistical analysisrevealed that many of the determined indices in subsurface drainage treatments were significantly different than those of the control treatment. The grain yield of subsurface drainage treatments was 0.91-1.65 t/ha greater than that of surface drainage treatment. The maximum tillering number, plant height, grain yield, and straw yield belonged to the bi-level drainage plots, while surface drainage treatment had the lowest values for these parameters.
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