SW4515

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Description

SW4515 is a FD4 variety with high yield potential and high resistance to stem nematode. This alfalfa variety has excellent overall disease resistance, plus high resistance to stem nematode for the northwest.

Product Guide

Agronomics

Yield Level	10	Aphanomyces Root Rot (R2)	HR
Fall Dormancy	4	Phytophthora Root Rot	HR
Winter Survival	1.5	Potato Leaf Hopper	N/A
DRI	35/35	Stem Nematode	HR
Bacterial Wilt	HR	Pea Aphid	R
Fusarium Wilt	HR	Spotted Alfalfa Aphid	R
Verticillium Wilt	HR	Blue Aphid
Anthracnose (R1)	HR	Southern Root Knot Nematode
Aphanomyces Root Rot (R1)	HR	Salt Germination

Planting

Planting Time:
- Early Spring: After hard freezing conditions have ended
- Late Summer/Early Fall: Allow 4-6 weeks of growth before the first hard frost
Seeding Rate: 15-20 lbs/acre
Ideal Seed Depth: ½”
- Alfalfa should be drilled into a firm seedbed or broadcasted and packed.

Fertility

Alfalfa requires 12 lbs of P₂O₅, 49 lbs of K₂O, and 5.4 lbs of S per ton of forage produced.
Make fertilizer applications based on expected yield and soil fertility levels.
If soil fertility levels are low, applying 25-30 lbs/acre of nitrogen at planting will help increase stand establishment.
Do not exceed a total of 10 lbs/acre of N+K if fertilizer is placed in-furrow at planting.

Weed Control

Plant into a clean, weed-free seedbed and consider using the herbicide options below for optimal weed control:

Timing	Herbicide	Rate	Notes	Weeds Controlled	Control Method
Preemergence (seeding)	Butyrac 200 (2,4-DB)	1-3 qts/a	Apply before weed heights exceed 3″. Minor crop injury may occur.	Broadleaves	Contact
	Pursuit (Imazethapyr)	3-6 oz/a	Apply when seedling alfalfa is in the second trifoliate stage or larger	Broadleaves	Contact
	Poast (Sethoxydim)	0.75-2.0 pts/a	Apply before weeds exceed 8″ in height.	Grasses	Contact
	Select Max (Clethodim)	9-16 oz/a	Apply before weeds exceed 8″ in height.	Grasses	Contact
	Broclean (Bromoxynil)	1.0-1.5 pts/a	Apply when alfalfa has a minimum of 4 fully developed trifoliates. Minor crop injury may occur.	Broadleaves	Contact
Postemergence (established)	Butyrac 200 (2,4-DB)	1-3 qts/a	Apply before weed heights exceed 3″. Minor crop injury may occur	Broadleaves	Contact
	Pursuit (Imazethapyr)	3-6 oz/a	Apply immediately after a cutting before excessive regrowth begins.	Broadleaves	Contact
	Poast (Sethoxydim)	0.75-2.0 pts/a	Apply before weeds exceed 8″ in height.	Grasses	Contact
	Select Max (Clethodim)	9-16 oz/a	Apply before weeds exceed 8″ in height.	Grasses	Contact

Disclaimer: All products and rates were provided by university-based sources and product labels. Always follow label instructions and consult your local chemical dealer and seed dealer before making any applications or planting the seed.

Management

Nurse Crops: Spring seeded alfalfa can be planted with a small grain nurse crop such as oats, barley, or spring triticale. Use 1/3 – ½ seeding rates of the nurse crop to avoid over competing with new alfalfa.
- Ex. 1 bushel of oats as a nurse crop vs. a full rate of 3 bushels.
Nurse crops have little benefit to late summer/early fall seedings and are not recommended.
Avoid pushing new alfalfa seedings too hard during the establishment year. 1-3 cuttings during the first year are acceptable, depending on growing conditions and regions.
Allow 3-4 weeks from the time of the last cutting until the average first frost date to allow alfalfa to regenerate reserves needed to survive winter and perform well the following year.