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How can glassiness in butterhead lettuce be prevented?

How can glassiness in butterhead lettuce be prevented?

Groenten en Fruit 38(16): 23

In a trial in which glasshouse-grown butterhead lettuces were fertilized at the basic rate, supplemented or not by nitro-chalk at 6 or 12 kg/ha, the incidence of glassiness was reduced from 43 to 12% by supplementing with N at the higher rate. In a trial with butterhead lettuces grown in nutrient solution with EC between 0.75 and 4.0 cm, raising the EC (electrical conductivity) to the highest level reduced the incidence of glassiness from 34 to 2%.

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