Foliar Periodicity in Trees

A Periodicity Theorem for Trees

In this paper we extend the notion of periodicity from words to labelled ordered trees. This is achieved by deening an equivalence relation on the support of the tree (the set of the nodes) and by requiring that equivalent nodes have the same label. Another requirement is that corresponding sons of equivalent nodes are equivalent too. Since the support of a k-ary tree may be described by a pree...

Zinc Nutrition of Fruit Trees by Foliar Sprays

Effective methods of supplying Zn to fruit trees are needed to combat widespread deficiency of this element all over the world. Soil applications are not very effective because the roots of fruit crops occupy deep soil layers and zinc does not easily move in the soil. Although foliar sprays are more effective, foliar-absorbed Zn is not easily translocated in plants, which necessitates repeated ...

Periodicity and Almost-periodicity

Variation in foliar δC values within the crowns of Pinus radiata trees

Although herbaceous species generally show little within plant variation in δ13C, trees show large spatial and temporal differences. We found that the aspect of exposure and branch length accounted for up to 6‰ δ13C difference within the foliage of individual trees of Pinus radiata D. Don. The foliage on branches 0.5 m in length was as much as 4‰ more depleted in 13C than foliage on 10-m long b...

Foliar Application of Arginine Improves Vegetative and Reproductive Characteristics of Bearing Pistachio Trees

Pistachio is one of the most important horticultural crops in Iran.  There is a unique role for amino acids in the plant response to stressful conditions, and special physiological role for Arginine (Arg) compared to other amino acids.  The effects of this compound were investigated on vegetative and reproductive characters of bearing pistachio trees of ‘Ahmad-Aghaei’. The experiments were done...