Alternate Bearing

Alternate Bearing


the nonannual fruiting of fruit and forest trees. Usually all fruit trees yield an annual harvest when they are young, but as they grow older they bear fruit periodically, often every other year. When poorly maintained, young trees may also bear periodically. Trees bearing stones or berries usually yield an annual harvest. In forest trees (such conifers as pine and spruce) and fruit trees, alternate bearing is caused to a large degree by climatic conditions, and it decreases from west to east.

The proper care of fruit orchards provides for the necessary concentration of nutrient substances in the plant cells, especially protein matter, and for an optimal ratio of carbohydrates and nitrogen, which stimulates the setting of flower buds in the harvest year for fruiting in the next year. In this way, annual harvests are ensured. To obtain a good harvest of high-quality fruit every year a tree must have 30 to 60 leaves for each fruit. This is possible if the tree has many annual shoots; thus, shoot formation is an important factor in high yield. Moderate flowering is one of the most important conditions for annual fruiting. Only a moderately flowering tree is capable of producing a large harvest and setting flower buds for the following year’s harvest. Abundantly flowering pome trees (apple and pear) should have their excess flowers or set fruits removed at an early stage of development by growth substances to preserve nutrient matter for the formation of the remaining fruits.

Alternate bearing characterizes only some plant varieties. For example, some varieties of apple (Slavianka, Pepin shafrannyi) yield annually, others (Antonovka obyknovennaia, Anis polosatyi) require special maintenance in order to do so, and still others (Kandil’-Sinap, Grushovka moskovskaia) are marked strictly by alternate bearing. Various agricultural procedures and the stocks to which varieties are grafted also influence the periodicity of fruiting.


Plodovodstvo. 2nd ed. Edited by V. A. Kolesnikov. Moscow, 1966.


References in periodicals archive ?
The accumulation of reserves in inversely related to crop load, and a depletion of them under heavy crop load has been related to tree collapse and the triggering of an alternate bearing habit [15].
Decrease of Alternate Bearing in Satsuma Manderin (Citrus Unshiu) by Balance Nutrition and Urea Foliar Application.
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This provides surgeons with wider design choices and flexibility to improve anatomic fit and function compared to currently available alternate bearing options.
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Nut trees are alternate bearing, meaning that they produce a large crop one year followed by a much smaller one the next year as the trees replenish their nutrients.
Pistachios are an alternate bearing crop with one year having high production followed by a lower production year.
Lastly, plums sometimes exhibit alternate bearing tendencies, which means that a heavy crop one year may be followed by a lighter crop the next.
This approval, along with the launch in June of the Durom(R) Acetabular Component for metal-on-metal articulation with Metasul(R) LDH(TM) Large Diameter Femoral Heads, greatly expands Zimmer's ability to offer alternate bearing options for hip replacement.
Due to the breadth and versatility of the patented technology, the Company expects surgeons to be able to benefit from the wider design choices compared to currently available alternate bearing options.
Zimmer will be able to offer surgeons a complete offering of alternate bearing surface options, including our successful Longevity(R) Highly Crosslinked Polyethylene, the Trilogy AB ceramic-on-ceramic system and the Metasul(R) Metal-on-Metal Tribological Solution," said Ray Elliott, Zimmer Chairman, President and Chief Executive Officer.
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