Fertilizer application – spring 2017

Fertilizer applications have begun; it’s officially the growing season! The amount of fertilizer we apply to each bed is determined by variety, soil conditions, and past practices, requiring constant evaluation of current conditions, history, and trends. Nutritional needs are also different for young vines as opposed to established plantings.

Additional nutrition is necessary because while cranberries have adapted (and thrive) in their native sandy soil, nutrients are taken from the bog through the harvest of fruit. “We’re at the roughneck stage right now for almost everything, and that means a lot of top growth as well as root growth, which in turn means the extra nutrition is necessary,” says manager Mike Haines. The three main elements usually added for nutrition are nitrogen, phosphorus, and potassium, and the team based their decisions on tissue samples, and last year’s yield. According to cranberries.org: “Cranberry plant demand for nitrogen is highest during three stages of the lifecycle critical to cranberry development–early growth, fruit set and bud set. Early growth is when the plant grows vegetatively through vining and root growth and produces a flush of new leaves. Fruit set is when the flower becomes pollinated and fruit begin to form. Soon after fruit set comes bud set when nitrogen is needed for both fruit development and production of the next year’s flower bud.”

In addition to aerial methods (as always, expertly done by Downstown Aero Crop Service) our team has also tried “fertigation”: a uniform application via irrigation system.

However, our team has decided to discontinue the practice for now. “We first tried it two years ago and ramped it up last year,” Mike says. “But with our current irrigation layout, it’s just not a fit at this point.” Instead, we’ll also make our usual applications via the new buggy method introduced last year!

Our team was really pleased with the results last year. We looked at the ones our neighbors were all using, which all have hopper spreaders, and decided we wanted something even more precise. So we added an air system with individual nozzles, and made improvements over the winter based on last year’s performance as well as modifying it for liquid application as well as dry.

Our team is also making sure the conditions are optimal: “We’re going to irrigate tonight, because it’s been so hot and dry,” Mike says. “We want to get that water into the soil so the plants can access those nutrients.”

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