Not more than a couple days when it is young. A few more after it is established. May want to look into balansa clover if that plot periodically floods... balansa is supposed to survive short periods of standing water...
I'll let you know... i have one field of 2.5 acres that will pool water. Havent saved up the $$$ to run drains off of it yet, but that is in the future. Ph is 8.0 after I reclaimed it. Drilled wheat with no fertilizer (too wet to run trucks over) last year and it was pitiful. The dry parts grew some anemic wheat, but the wet parts had nothing. I got it drilled with wheat, balansa clover, and ecotill radishes, then gave it a good dose of fertilizer this fall. So far, seems to be germinating well.
I know this field will grow summer crops, as my grandad used to grow silage every summer in it 40 years ago when I was a kid. I may be asking too much of it for a winter crop, however due to how much standing water gets on it from December thru March.
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