Would no planking result in enhanced seed picking by birds and poor crop stand?
It is observed that most birds are unable to pick up wheat seed placed in narrow slits (3-4 cm wide and 4-7cm deep). It could be further ensured by treating the seed with cow dung to give foul smell. It is advisable not to treat the seed with poisonous substances as it may kill some bird in some eventualities. Not covering the slit in fact helps seed to absorb moisture from over-night high humidity and assist early emergence of the young seedlings.