From last week:
IT IS not just a rainfall quantity that you need; it is a combination of significant rainfall events plus time.
This is because the Isoxaflutole active ingredient of Balance has attributes such as not being very degradable by UV rays, binding to soil colloids and having uptake sites on roots, seeds and shoots, which I believe will make it a very real partner choice in future fallow weed control decisions.
The main criteria for Balance degradation are rainfall and time.
You need both parameters to occur to be sure of this unusual Group-H- mode-of-action herbicide to be comfortable with a double crop decision such as the planting of sorghum or mung beans, since both these crops need 10 inches of rain and seven months from application date to make it possible to even contemplate planting these summer crops.
Of course, dry weather and colder soils can prolong this time period to be over seven months in duration, which is what we have had a lot of lately.
Do not just assume that because you have 10 inches of rain in a single event just before Christmas that you can plant sorghum in early January, because your Balance will be all gone.
It is not so, and more than once over the years have I observed sorghum plants getting to 12 inches high and then a significant rain event occurring to reactivate the Balance active ingredient of Isoxaflutole and its DKN metabolite, with the end result of this being characteristic white bleaching and stunting of growth from its residual nature.
So, like a lot of our very handy residual herbicides, the plant back time to other sensitive crops needs more than just a label comment. It also needs understanding about its potential to be present in sub-lethal amounts for an extra period of time if the weather, soil and organic matter do not line up for re-cropping intervals.
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