Effect of cyanamide and DNOC/oil on budbreak, yield and fruit size of Golden Delicious apples

North, M.S.

doi:10.1080/02571862.1989.10634506

Cited by 4 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As observed in our data, the number of flower clusters the following season was increased. Rest-breaking treatment also normalised and hastened the flowering period (Lee, 1994;Petri & Stuker, 1995;North, 1989).…”

Section: Discussionmentioning

confidence: 99%

Effect of mineral oil and hydrogen cyanamide concentration on dormancy breaking in ‘Golden Delicious’ apple trees

Sagredo

Theron

Cook

2005

South African Journal of Plant and Soil

View full text Add to dashboard Cite

South African production are!3S receive insufficient winter chilling for apple production, necessitating the use of artificial means to break dormancy_ Hydrogen cyanamide (HC) alone or in combination with mineral oil (oil) is used as a rest-breaking agent in many deciduous species. The effect of different concentrations of HC and oil on budburst, yield, fruit quality and vegetative growth of mature 'Golden Delicious' apple trees were evaluated; the objective was to determine the presence of interaction between the rest-breaking effect of HC and oil when combined at varied concentrations, and to determine appropriate concentrations of HC and oil, to enhance budburst, yield and fruit quality. Three trials were conducted in the Elgin valley (34 oS, 300 m) of the Western Cape, South Africa, in 1999 and 2000. The first trial evaluated four concentrations (0, 0.5, 1 and 2%) of Dormex® (hydrogen cyanamide 520 g·L-1 ) in combination with four concentrations of mineral oil (0, 1, 2, and 4%). The second trial used three concentrations (1, 2 and 4%) of Dormex® in combination with three concentrations of mineral oil (1, 2, 4%), plus an unsprayed control, and a treatment of 6% of DNOC Winter Oil®. The third trial included five treatments: 0.5% Dormex® + 3% oil, 1 % Dormex® + 4% oil, 6% DNOC Winter Oi/®, 6% oil and a non-sprayed contro/. All of the treatments were applied at the first visible signs of bud burst. No synergistic effect was observed between oil and HC. Mineral oil at 4% plus 1 to 2% Dormex® were sufficient to break dormancy. Dormex® at 4% (2.08% HC) reduced fruit set and yield.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of mineral oil and hydrogen cyanamide concentration on dormancy breaking in ‘Golden Delicious’ apple trees

Sagredo

Theron

Cook

2005

South African Journal of Plant and Soil

View full text Add to dashboard Cite

show abstract

“…The lack of treatment differences in regard to fruit set and fruit size of these fruitful, relatively young Golden Delicious trees in a high density planting, contrasts with earlier findings of an increased fruit set on mature Golden Delicious trees in a marginal zone (North, 1989). Yet, as found previously, little effect on yield is expected from any of the above treatments.…”

Section: Please Scroll Down For Articlementioning

confidence: 58%

An attempt at estimating solar radiation at South African sites which measure air temperature only

Clemence

1992

South African Journal of Plant and Soil

View full text Add to dashboard Cite

“…However, previous studies have indicated little benefit from this practice in terms of yield (North, 1989).…”

mentioning

confidence: 92%

“…An alternative agent, hydrogen cyanamide, has proved to be a powerful rest-breaking agent on a range of fruit kinds (Snir, 1983) and is less toxic than DNOC/oil. However, its excessive price and limited ability to increase fruit yield relative to DNOC/oil (North, 1989) restricts its use on large apple trees. Yet the use of cyanamide' solely 0r in combination with other agents may be economically justified where the need for tree manipulation is more critical.…”

mentioning

confidence: 98%

Alternative rest-breaking agents to DNOC/oil for apples

North¹

1992

South African Journal of Plant and Soil

View full text Add to dashboard Cite

Effect of cyanamide and DNOC/oil on budbreak, yield and fruit size of Golden Delicious apples

Cited by 4 publications

References 2 publications

Effect of mineral oil and hydrogen cyanamide concentration on dormancy breaking in ‘Golden Delicious’ apple trees

Effect of mineral oil and hydrogen cyanamide concentration on dormancy breaking in ‘Golden Delicious’ apple trees

An attempt at estimating solar radiation at South African sites which measure air temperature only

Alternative rest-breaking agents to DNOC/oil for apples

Contact Info

Product

Resources

About