The key to using salt as a herbicide is putting it on when its hot and dry. Its similar to ammonia nitrate, nobody in their right mind will spread AN on grass when its hot and dry cause it will burn it up. That's one of the downsides to applying lots of fertilize on pasture, it needs moisture to make it work. If it turns off hot and dry the fertilized fields will turn brown quicker. As long as there is plenty of moisture everything is fine.
Back in my tobacco growing days, often tobacco farmers would sidedress their tobacco with ammonia nitrate after already putting down enormous amounts pre-plant and occasionally a farmer would apply too much and the remedy would be to apply a ton or so of high calcium lime...which was very fine almost like powdered sugar.
The reason was because the AN would drop the Ph temporarily especially in dry times, causing a condition called manganese toxicity.
Back in my tobacco growing days, often tobacco farmers would sidedress their tobacco with ammonia nitrate after already putting down enormous amounts pre-plant and occasionally a farmer would apply too much and the remedy would be to apply a ton or so of high calcium lime...which was very fine almost like powdered sugar.
The reason was because the AN would drop the Ph temporarily especially in dry times, causing a condition called manganese toxicity.
