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  • Author or Editor: I. Al-Shalan x
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Abstract

The pistachio (Pistacia vera L.), characteristically a biennial bearer, produces its most extensive shoot growth in years of heavy crop production. Whereas levels of total sugars in bark and wood of bearing and nonbearing branches were similar throughout the year, starch levels tended generally to be higher in nonbearing than in bearing branches. Consequently, nonbearing branches one year gave rise to heavy crops the next and, beacuse of greater quantities of reserve foods, also produced extensive shoot growth. Bearing branches of that same year, .however, produced few or no nuts the next and, because of lesser quantities of reserve foods, produced markedly less shoot growth. No relationship between total nitrogen level and shoot growth or fruiting was evident.

Open Access

Abstract

Alternate bearing in the pistachio (Pistacia vera L.) is brought about by abscission of inflorescence buds during July and August when seed growth and development take place. There was rapid accumulation of sugars and conversion to fat in the nuts at that time, but sugar and starch levels in the bark and wood of nut-bearing branches were not appreciably different from those in similar tissues of non-bearing branches. The inflorescence bud-drop phenomenon does not appear the result of carbohydrate deficiency.

Open Access