Delaying permanent water on drill sown rice

Summary

Delayed permanent water (DPW) is an alternative water management practice for drill sown rice that increases water productivity. The rice crop is sown and initially managed the same as a conventional drill sown crop, but permanent water application is delayed until at least 50 days after the first flush irrigation.

The reduced time the crop grows in ponded water results in lower water use, primarily due to reduced evaporative losses from the water surface before the crop reaches full canopy cover. There are also water savings from reduced percolation losses, which vary with soil permeability.

Topics include:

  • water savings
  • grain yield
  • sowing
  • irrigation
  • when to apply permanent water
  • nitrogen management
  • weed control



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Primefact 1238 Fourth Edition

Published: Jun 2023