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- Author or Editor: Assem D. Shaltout x
Abstract
In the paper “Rest Completion Prediction Model for ‘Starkrimson Delicious’ Apples” by Assem D. Shaltout and C.R. Unrath [J. Amer. Soc. Hort. Sci. 108(6):959–961, 1983], there is an error on page 959 in footnote y for Table 6. The correct version of the footnote is as follows:
Abstract
Rest of ‘Delicious’ apple (Malus domestica Borkh.) buds was satisfied partially by applications of 6-ben-zylamino purine + gibberellic acid (BA+GA4+7 = Promalin), BA alone, potassium nitrate, and thiourea; GA4+7 alone had no effect. The combination of thiourea and potassium nitrate was as effective as Promalin or BA in stimulating flower bud development. Potassium nitrate had a pronounced effect on forcing flower buds while thiourea had more effect on forcing vegetative buds. BA and Promalin affected both flower and vegetative buds. No treatment affected bloom date or growing degree hours (GDH) required for flower bud expansion under our conditions when applied after 450, 950, or 1200 hours of chilling. Promalin and BA were both effective at 300 and 500 ppm, while thiourea and potassium nitrate were effective at 2% and 3% (w/v), respectively.
Abstract
A chill unit model was developed for ‘Starkrimson Delicious’ (Malus domestica Borkh.) apples grown under the wide range of temperature and elevations in North Carolina. The model relates air temperature to effective chill units and predicts rest completion for North Carolina-grown apples more accurately than previously reported models. The model proposes a broader range of effective temperatures and incorporates a greater negative effect when temperatures exceed 21°C for rest. According to the model, 1200 chill units are required to break rest of apple buds. Growing degree hours correlated with each apple bud developmental stage, as well as from projected date of rest completion to full bloom, were determined using various base temperatures.
Abstract
Application of BA, GA4+7, and Promalin (GA4+7 + BA) to 2-and 3-yearold spur ‘Delicious’ apple trees [Malus domestica(Borkh.)] resulted in an increased number of laterals (> 15 cm) and feathers (5-15 cm). Concentrations of 250 and 500 ppm were most effective. Application at 5 cm of terminal growth was most effective while application after 10 cm was ineffective. Use of the surfactants, Buffer X or Tween 20 (0.3%) with BA application, increased the branching response. Chemical names used: N-(phenylmethyl)-lH-purin-6-amine (BA), Gibberellins A4 + A7 (GA4+7).
Abstract
Trials were conducted using paclobutrazol (PP333) either as a foliar application or a soil drench to improve berry set and yield of ‘Roumi Red’ grapes (Vitis vinifera L.). Concentrations of 100 and 250 ppm (foliar applications) and 2 ml/vine as a ground application had no effect on either chlorophyll and carotenoid leaf content or physical and chemical properties of berries, other than cluster weight and number of berries/cluster, which increased significantly. Concentrations of 1000, 1500, and 2000 ppm and 4 ml/vine reduced shoot and internode length as well as °Brix, whereas physical and chemical properties of berries, bud fertility, chlorophyll, and carotenoid leaf content were increased. A carry-over effect was noticed the year following the year of application with concentrations of 750 ppm and 3 ml/vine or higher. Chemical name used: β[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).