The effect of urea sprays on the nitrogen content of apple leaves

Sako, J.

Maataloust. Aikakausk 31: 184-90

1959


Accession: 014243656

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Abstract
In 1954 and 1955 apple trees of 4 varieties were sprayed 4 times after flowering with urea solutions of 1.0 and 0.75%, in addition to receiving an application of 400 kg. ammonium sulfate per hectare. Leaf samples were taken 3 times during the growing season. Urea sprays had a marked effect on the N content of the leaves, the difference between the leaves of treated and control trees being 0.62-1.19% N after the fourth application.