How do I control weeds in hemp fiber?
Hemp fiber controls weeds by closing a tall, even canopy. Most herbicides are not labeled for hemp, so a gap in the row is the weed problem.
How do I control weeds in hemp fiber?
With a stand that shades the row. Fiber is planted dense and tall, and the weeds that matter are the ones that occupy a gap in the first weeks. Most herbicides are not labeled for hemp, so a corn herbicide is not a fiber plan. rechem's contribution is organic planting chemistry that helps that stand come up even.
Related reading
Related reading
What do I do after hemp comes up?The first weeks decide the stand. rechem's post-plant chemicals support that stand. They are not a rescue spray.
Fiber's weed program is the stand. Plants that emerge together and hold a canopy take the light a weed would have used. Plants with skips in the row hand that light away. Heartland is clear that most herbicides are not labeled for hemp. The first weeks are the window, which is the same warning as What do I do after hemp comes up?.
The grain version of this question is How do I control weeds in hemp grain?. What you are allowed to spray at all is What chemicals are allowed on hemp?.
Why fiber can shade itself
A fiber crop is supposed to be a wall of stalks. HFGA talks about fiber as a stand you cut, dry, windrow, and bale. That stand only shades the row if emergence was even. A herbicide borrowed from corn does not repair a drill that left gaps, and it can fail a textile lot if it was never labeled for hemp. Confirm the stamp in EPA's Pesticide Product and Label System.
The seedbed that gives you that emergence is How do I prepare a field for hemp?. rechem's fiber chemistry sits on top of that prep, on the seed and in the planting pass: What planting chemistry does hemp fiber need?.
What rechem will not hand you
A mid-season burn-down calendar. The textile standard and the rechem program are both trying to stay out of rescue sprays. If a weed is already ahead of the crop, the honest next step is the field you have, the label you can read, and a call while the row is young. The crop page is Hemp fiber.
FAQ
Quick answers about this part of the approach.
Can I spray a corn herbicide on fiber hemp?
No, unless that product's label lists hemp. Heartland is explicit that most herbicides are not labeled for the crop.
When is the weed window?
The first weeks, before the canopy closes. After a uniform fiber stand shades the soil, late weeds get less light.
What does a weedy fiber field cost?
Thin bast, uneven retting, and weed material in the bale. The buyer is paying for stalk, not for whatever filled the skip.
Does cultivation replace a label?
A clean seedbed and an even drill do the work a missing herbicide label will not do. Cultivation still has to fit the crop you planted.
Is grain weed control the same?
The label rule is the same. Grain stays more open because those plants branch, so the shade arrives differently.