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Craig E. Kallsen, Dan E. Parfitt, and Brent Holtz

method developed by Hoblyn et al. (1926) and reviewed by Pearce and Dobersek-Urbanc (1967) as follows: where, I = the alternate bearing index, n = number of years for which the alternate bearing index is calculated, and a i = yield in the

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Neusa M.C. Stenzel, Carmen S.V.J. Neves, José C. Gomes, and Cristiane C. Medina

This study reports the performance (yield, tree size, and fruit quality) of 'Ponkan' mandarin (Citrus reticulata Blanco) on seven rootstocks, evaluated for 11 years under Southern Brazil conditions. Trees on C13 citrange had higher cumulative yield for seven harvests than those on trifoliate orange. Cleopatra mandarin, rough lemon, Rangpur lime, Sunki mandarin, and Volkamer lemon rootstocks maintained their values at an intermediate position and did not present any significant difference regarding C13 citrange, and trifoliate orange. Trees on C13 citrange and on trifoliate orange exhibited the lowest alternate bearing index. Cleopatra mandarin induced the greatest canopy volume, but it was not significantly different from Sunki mandarin and rough lemon. The smallest trees were those on Volkamer lemon and trifoliate orange. The highest yield efficiency came from trees on C13 citrange and the smallest on Cleopatra mandarin. Rootstocks did not significantly affect fruit weight.

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Louise Ferguson and Sergio Castro Garcia

a statistically insignificant 0.11 difference in the calculated alternate bearing index between the mechanically and hand trees, averaging 0.62 and 0.51, respectively ( Monselise and Goldschmidt 1982 ). This is probably a function of the weather

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Michael W. Smith

annually at 1.4-m height while trees were dormant. An alternate-bearing index was calculated for each tree using the equation: where I was the alternate-bearing index; n was the number of years; and a 1 , a 2 , and a n were yields of corresponding years

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Leonardo Lombardini

Twenty-five-year-old `Cape Fear', `Desirable', and `Kiowa' pecan [Carya illinoinensis (Wangenh.) C. Koch] trees were either not pruned, or subjected to single selective or mechanical pruning using a mechanical hedger [or hedge pruning (HP)] in the dormant season 2003. Canopy light interception, yield, and nut quality were monitored during a period of three years. Leaf area index and light interception were significantly affected during the first growing season after treatment application, but after three years canopies grew back to control levels. In general, there were small positive effects observed on yield and nut quality after pruning. Minor improvements were recorded for `Desirable', in which yield was affected positively by both pruning strategies in 2004. However, most effects disappeared by the third year. `Desirable' responded better than `Cape Fear', whereas no beneficial effects were recorded on `Kiowa'. In 2005, yield was significantly reduced in HP trees of `Cape Fear' and `Kiowa'. Alternate bearing index was unaffected by pruning treatment or cultivar. Kernel percentage increased only in HP `Desirable' trees in 2003 and 2004. Kernel quality was improved in HP `Cape Fear' and `Desirable' in the first growing season after treatment application, but not in 2004. In 2005, quality was again improved in HP `Desirable'. The results of the current study indicate that one-time pruning of pecan trees induce positive short-term effect on light, but not necessarily an increase in productivity and nut quality.

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Heriberto Aguilar Pérez, Jesús Arreola Ávila, Emigdio Morales Olais, Eutimio Cuéllar Villarreal, Ángel Lagarda Murrieta, Héctor Tarango Rivero, Jesús Humberto Núñez Moreno, and Leonardo Lombardini

’. Yield data indicate that ‘Norteña’ is a good producer; in a 7-year period, it averaged 18.0 kg per tree ( Table 2 ). Alternate bearing index ( I ), as calculated according to Pearce and Doberšek-Urbanc (1967) , was low (0.39), at least during this

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Charles T. Rohla, Michael W. Smith, Niels O. Maness, and William Reid

cluster, and number of current season's shoots with female flower clusters were determined. Total yield per tree was measured annually and the alternate-bearing index ( I ) was calculated ( Pearce and Dobersek-Urbanc, 1967 ) for each cultivar. Values of

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Bruce W. Wood

the presence of irrigation. Table 1. Annual in-shell nut yield and associated alternate bearing index (ABI) for ‘Desirable’ trees receiving one of four mechanical pruning treatment strategies in each of 4 years beginning in 2003. z There was poor

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Lauren C. Garner, Vanessa E.T.M. Ashworth, Michael T. Clegg, and Carol J. Lovatt

alternate bearing index (ABI) was calculated for the 2-year period using the equation: in which yield was defined as total kilograms of fruit per tree. ABI ranges from 0 (no alternate bearing) to 1 (complete alternate bearing). Statistical

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Joan Tous, Agustí Romero, Juan F. Hermoso, Antònia Ninot, Joan Plana, and Ignasi Batlle

per tree), yield efficiency [cumulated pod yield 1997–2005 per unit canopy volume in 2005 (kilograms per cubic meter)], alternate bearing index ( Pearce and Dobersek-Urbanc, 1967 ), ease of harvesting (high, medium, or low), and fruit and seed