Broad leaved weed control products in lupin are limited, but there are numerous choices in cereals. Essentially, growers can clean up their broad leaved weed challenges in fields prior to growing lupin.
Fall rye residue is known to have allelopathic properties and poorly spread residue could potentially inhibit growth of lupin.
Canola stubble is a poor choice to seed into because of the aggressive growth and pervasiveness of the hybrid volunteers and flushing nature under high precipitation conditions especially past the window of spraying for crop safety. As well, seeding a broad leaf crops on broad leaf stubble (canola, field pea, faba bean) is not recommended because of diseases(root rots, leaf) in common.
Calcium carbonate (associated with high pH soils) negatively affects nodulation and the growth of L. Angustifolius.
Numerous herbicide products applied post crop emergence on low organic matter soils/degraded knolls are known to cause crop damage (check product label for restrictions).
Manured fields are known to increase soil nitrogen levels which may lead to rhizobium not fixing nitrogen biologically (called lazy rhizobium) accompanied by an increase in vegetative growth (biomass) and a later maturing crop. Do not seed on fields that have had manure within the last 5 years.
A pre-harvest, glyphosate is highly recommended to control quackgrass, Canada thistle, dandelion, perennial sow thistle and toadflax(exception would be on fields where the seed is kept for seed production).
Infinity* (pyrasulfotole +bromoxynil) and Tundra(pyrasulfotole + fenoxyprop-p-ethyl +bromoxynil).
Watch pre-emergent and post seeding applications of any product [i.e. Express SG*(tribenuron-methyl + glyphosate or 2, 4-D].
plants/ft² X g TSW ÷ 10
(0.98 germination - 0.2 mortality/emergence = 0.96)
= 200 lbs/acre
This seeding rate is based on your assigned values of 10 plants/ft², 98% germination, 2% seedling mortality, 10 inches row spacing and 200 grams/1000 seed weight.
Desired plant density (plants/ft²) = 10
Germination rate (%) = 98
Emergence mortality (%) = 2
Row Spacing (inches) = 10
1000 seed weight = 200
Seeding Rate Calculator Results
Seed 199.9 lb/ac to obtain 10 live plants per square foot. Your seeder must be calibrated so that each opener drops 173.5 grams of seed per 100 feet of travel or 8.7 seeds per foot of row, based on a 10 inch row spacing.
Use the correct strain of rhizobia specific to lupin to ensure a healthy competitive crop
[Herbicide Group Number]
A pre-harvest, glyphosate on the previous cereal crop is recommended to control quackgrass, Canada thistle, dandelion, perennial sow thistle and toadflax(exception would be on fields for seed production).
Fall applied Edge(ethalfluralin) has proven to provide more consistent weed control results compared to spring applied. Pulse growers have had many positive comments about the product’s effectiveness fall applied with many only having to go in to touch up the fields with grassy weed control.
A pre-seeding burndown is recommended to control early germinating broadleaf weeds and give lupin a foot up in crop growth.
Grassy weed control products appear to have very little crop safety concerns.
Sencor (metribuzin) can and will cause damage especially if water volume is below 17 gallons/acre as well as low organic matter soils or degraded knolls.