How big are they? Are you fighting a grass infestation? I’ve spread with my tractor 6 weeks after planting with no ill effect. I’ve found extra urea really helps. I shoot for a total of 100+lbs of actual nitrogen so at least 200lbs of 46-0-0.
If you put down 2-50lb bags of 46-0-0, you actually only put down 46lb of urea. Some either don’t think about that, forget, or don’t know.
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Urea usually hangs on for about 30 days. Longer if you have a heavy soil. I'd give it 3-4 weeks, and also watch for things to start turning pink and yellow, or make sure to put it down so the second shot has at least 30 days for utilization before it gets cold.I put down 100 lbs per acre on my brassica plots last week before 2 inches of rain, over a few days. When is to soon to add more? Or should I not add more. I would like to get the most growth out of them.
You can broadcast it while it is raining provided:I know you shouldn’t broadcast Urea onto wet plants while it’s not raining, so they don’t get burned. But can I broadcast it while it’s raining? Or does it have to find its way to the ground while it’s dry so it doesn’t burn the plants?
You can broadcast it while it is raining provided:
#1, that it's not so wet that you draw ruts in the field and ruin an excessive amount of your crop.
#2, that it doesn't stop raining as you finish, and burn part of your crop.
#3, that you wash your wet spreader right away, or it will rust to nothing before the next season.
#4, that you have a raincoat or a cab tractor
The sooner it rains on nitrogen fertilizer after spreading, the less that is lost to vaporization into the air. So, spreading in the rain should yield the best results. Your dedication should pay back huge dividends for your brassica crop growth rate.Perfect! We are getting an inch or two of rain tonight. It started about an hour ago. So as soon as I saw your response I ran up to my place, only a 15 minute drive. I put more down since I forgot about 100 pounds of fertilizer was only 46 pounds of nitrogen.
I still have another 6 bags for some other plots as they mature some more. I planted those later then I wanted.
The sooner it rains on nitrogen fertilizer after spreading, the less that is lost to vaporization into the air. So, spreading in the rain should yield the best results. Your dedication should pay back huge dividends for your brassica crop growth rate.
Maybe I just have better soil than I thought, but I’ve never put a second application of urea in brassicas. I do put a true 100# of actual product at planting though.