Making A Stand

Does a higher seeding rate pay dividends?

• By Amanda Huber •

peanut seedIf some is good, then more is better is not a mantra for peanut seeding rates. Producers need to plant enough seed to provide at least four plants per foot of row. To do this, seeding rates of six seed per foot of row on singles and six to seven combined seed per foot on twins, or three seed per foot per twin row, are recommended.

University of Georgia Extension Peanut Agronomist Scott Monfort says, “You need to end up with four plants per foot of row on the final stand to not have skips or gaps.”

No Skips Or Gaps

Early research on tomato spotted wilt virus found that the disease was more prevalent around skips or gaps in peanut coverage. The recommendation to plant enough seed to provide at least four plants per foot to reduce the impact of TSWV stands today.

However, researchers have found that some producers are pushing the seeding rate up significantly to ensure a good stand and to increase yield. But is it necessary? Does increasing the seeding rate increase yield and pay for the extra cost of seed?

“Although you want to plant good quality seed, you can’t bank on having perfect seed,” Monfort says.

Keep A Sample

How do you know if you have good quality seed? “That’s not an easy question to answer,” says University of Georgia Cropping Systems Agronomist Scott Tubbs. “One thing producers should do is a visual inspection of the seed before planting.

“If you see a bunch of split seed, those are not going to germinate. You may need to bump up your seeding rate so you get the number of viable seed in the ground that you need.

“If you get your seed early enough, you can pull a sample out and send it to a seed lab for a more accurate germination rate. You can also conduct a rudimentary test at home.”

Tubbs also suggests producers keep all the seed bag tags and note the purchase and delivery dates. Additionally, keep a small sample of each bag in a cool, dry place so that if a stand problem does arise, the sample can be sent to the lab for germination tests.

“Keep your sample under proper conditions so that it can be tested and you can use it in the event of a seed arbitration issue. Seed is a significant investment so you want to take care of it and get it in the ground under optimum conditions.”

A Rate To Achieve Optimum Stand

Monfort says this year there are some concerns about germination rates of peanut seed, and farmers will need to consider seeding rate carefully.

seeding rate chart“Seeding rates need to be adjusted for percent germination of the seed being planted to ensure you have the desired plant population. However, we have found that if you are pushing the seeding rate above a rate that gets you four plants per foot of row, you may be spending money that you don’t need to spend,” he says.

In an on-farm trial in 2019, Monfort looked at seeding rates of six, seven, 10 and 11 seed per foot using a variety with 700 seed per pound on single rows.

He says at six seed per foot, they got 5.5 plants; seven seed per foot produced 5.7 plants per foot; 10 seed per foot produced 6.8 plants per foot of row; 11 seed per foot produced 7.4 plants.

“We had to think, ‘What’s going on with the last two? Why are we losing so many plants?’

“When you think about it, six seed per foot is a seed about every 2 inches. Seed planted at seven to eight seed per foot is even closer and nearly touching. For seed planted at 10 to 11 seed per foot, some of those seed are sitting on top of one another.”

“If you look at that data, an additional three seed per foot only gained 1.1 more plants per foot,” Tubbs says. “In that situation, it cost a lot of extra money to put seed in the ground that did not gain extra plants.”

Adding Extra Cost Not Yield

As for what these seeding rates produced, six and seven seed per foot yielded 6,274 and 6,462 pounds per acre, respectively. The higher seeding rates of 10 and 11 seed per foot yielded 6,509 and 6,337 pounds per acre.

When costs were added in, the seeding rate of seven seed per foot made $19 per acre.

“At 10 seed per foot, we lost $42 per acre and at 11 seed per foot, the loss was $58 per acre,” Monfort says. “Although it was just one year of data, I think we found that the higher seeding rate did not add more yield but did add more cost.”

“In all the cases, they were above four plants per foot and the needed population to maximize yield potential had already been reached. The extra plants weren’t doing anything to add more yield,” Tubbs says.

Many other factors go into achieving a uniform stand of vigorously growing peanuts, but a final stand of four plants per foot of row is best to reduce the risk of TSWV.

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