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Home » Diverse pollinators improve canola production
pollinators research
POLLINATION ...

Diverse pollinators improve canola production

Study shows the proximity of canola fields to semi-natural areas can increase yield

PUBLISHED ON April 18, 2021

The lady spotted butterfly was spotted feeding on canola nectar for the first time. (Courtesy Photo)

MADISON, Wis. — Farmers pay attention to many aspects of their crops. They carefully track how much water they are giving them and the amount of fertilizer they are using. But what about how many bees and butterflies are visiting?

Mariana Paola Mazzei, a researcher specializing in crop pollination, and her collaborators think it’s time to start caring more about pollinators. They stress that it’s important to have what are called semi-natural areas around crop fields. This helps more pollinators visit the crops.

The team’s research was recently shared in Crop Science, a journal of the Crop Science Society of America.

Their recent research tested if canola plants in Argentina have a better yield if they are close to semi-natural areas. These areas have more pollinators. They looked at how pollinators affected different aspects of canola production. This included the total number of fruits, seeds per pod, and seed mass.

“Pollinating insects visit flowers to feed on nectar, pollen, or both,” Mazzei explains. “This flower-pollinator interaction allows pollen flow between flowers, carried on insects.”

Pollinators can help increase yield by putting a higher number of pollen grains on a flower. This means there will be more seeds produced per pod. Also, if more flowers per plant are fertilized, there will be more total seeds in a field.

Their results showed that the closeness of the crop to semi-natural habits can indeed increase the yield of canola. The closer the canola was to the pollinators, the more yield increased.

The team also looked at what pollinators were present in the canola fields. The types of pollinators, quantity of pollinators, and diversity of pollinators visiting crop fields are all important factors.

Honey bees were the most common and important pollinator. Researchers also found native species, such as types of hoverflies, flies, butterflies, wasps, and carpenter bees. Some of the species were found pollinating canola for the first time.

“The number of pollinating species is important because a higher diversity means more chance of fertilization and seed production in this crop,” Mazzei says. “Seeing new species of pollinating insects in this crop allows us to make better recommendations to help semi-natural habitats. It also helps design future ideas to help the pollinators.”

The research team offers many strategies for increasing the number of pollinators. The most important is to diversify the landscape to make it more welcoming to pollinators. This can start with diversifying the crops themselves.

“A diversity of crops that bloom at different times will attract more pollinators throughout the year,” Mazzei explains. “Having a lot of the landscape be the same crop reduces the stability of pollinating species and how many there are.”

“These plots of diverse crops should be merged with semi-natural habitats,” she adds. Having semi-natural areas throughout the landscape helps pollinators move between them.

“These sites provide shelter, nesting sites, and different food items for the pollinators along the season,” says Mazzei. “The main policy recommendation to help crop pollination is having a minimum level of semi-natural habitats around crop plots.”

A last strategy is to create a crop management plan that is good for pollinators. This means, for example, reducing chemical use or using them at night or evening. This is when pollinators are less likely to be affected by them.

“People usually think of insects as bad for crop plants,” Mazzei says. “They may not understand why pollinating insects are good. We showed that even in landscapes of central Argentina with a lot of agriculture and a low natural biodiversity, pollination is an important input for canola production.”

Mariana Paola Mazzei is a researcher at the National University of Rosario. This research was funded by Argentina’s National Scientific and Technical Research Council (CONICET), the National University of Cordoba, the Fund for Scientific and Technological Research (FONCyT), and Syngenta.

— ASA, CSSA, SSSA

For more row crop news, look here.

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