Sub soiling and deep cultivations hit the headlines in Ukraine this year; well it would have done if I had written the headlines.
Spring this year was wetter than average which did nothing to encourage roots to grow deep looking for water. Added to this is the sub surface compaction that blights most of Ukraine and shallow, lazy rooted spring planted crops like soya and it becomes apparent why yields have been so low this drought year.
Would sub soiling have helped?
The theory being that deep cultivations break up compaction allowing deeper root penetration and these plants are better able to withstand drought conditions than plants growing over compaction with a shallower developed root structure.
Is there any evidence to support this?
I have data on soya grown in central Ukraine over sub soil compacted soil achieving an abysmal 0.7MT/ha and not too far away on land that had been sub soiled achieving yields of 1.5MT/ha.
Some of this uplift might have been down to different agronomy or localised rainfall at key times but surely not all of it.
OK, so let’s assume it was down to better, deeper rooting which was achieved by sub soil and we want to subsoil for the next crop. Wisdom has it that you should sub soil in the summer on dry soils to get the maximum amount of shattering and cracking.
But if we want to plant in the spring we can’t do that so we need to sub soil in the spring when the land is wet and there is a danger of smearing with very little cracking and shattering.
Which eventually brings me to my point.
Assuming you could get a sub soiler in to frozen ground and you had the horses to pull it and assuming it didn’t break; would sub soiling in the winter have a similar effect to sub soiling dry soil in the summer and the frozen, brittle soil crack and shatter in a similar manner?
Anyone want to admit to trying it?

Looks like the end of the mild spell, much cooler today, hats and gloves all round.

I moved apartment a couple of weeks ago and now live on the gloriously named “Heroes of Stalingrad Street” with some fantastic views across the river Dnieper.
Weed control has generally been good but residual herbicides applied in the dry have obviously been less effective than they should be. Coupled with smaller plants and a patchy emergence I think we might have to rely on desiccants to help with the harvest.
Wheat plant populations in Ukraine is a hotly debated topic (well it is by me) and I will come back to this one at a later date but the aim is to achieve 450 to 500ppm2 because tillering is a bit of a problem.
Various thistles species continue to be problematic but in patches and rarely enough to justify spraying a complete field. When we introduce GPS technology we might map these and apply clopyralid if we can get hold of it.


...well it is now.
Still out and about and internet connection is a bit ropey hence the lack of blogs. I will be back at the weekend with some interesting pictures and if I get time a brief video.
Not quite an Indian summer but mild weather persists much to the relief of many farmers with late germinating and slowly developing crops in the ground.