Effect of some Treatments on Vegetative Growth, Yield and Fruit Quality of Gold Nugget Mandarin Trees

Abstract

This investigation was conducted during two successive seasons (2019/2020; 2020/2021) on almost 12year old identical Gold Nugget mandarin trees Citrus reticulata Blanco (Wilking mandarin x Kincy mandarin), grafted on Volkamer Lemon (Citrus volkameriana) (VOL) rootstock cultivated in a private orchard located in Al Qalyubia Governorate, Egypt. The trees were grown at a distance of 2 × 6 m in silt soil under the Immersion irrigation system. To study the effect of hand thinning, chemical thinning using NAA at 400ppm, Potassium nitrate (5gm/L), Spirulina platensis ( algae extract) (2cm/L) and Potassium sulfate (1.25g/L) +Zinc sulfate (2.5g/L) +Salicylic acid (0.11g/L) on vegetative growth, fruit quality and yield of Gold Nugget mandarin trees. The experiment was designed as a randomized complete block design with five replications. Results illustrate that most of the experimental treatments significantly increased tree canopy volume both hand or chemical thinning was the highest value and Chemical thinning treatment significantly increased leaf area. Potassium nitrate foliar spray significantly increased shoot thickness, number of leaves/ shoot. Spirulina platensis treatment enhancing of the spring growth cycle, number of flowers, fruit-set, number of fruits/tree, tree yield efficiency as the number of fruit / M 3 canopy and vitamin C. as for Potassium sulfate + zinc sulfate+ Salicylic acid treatment was superior with statistic differences for tree yield as kg/tree and kg/ M 3 , fruit physical properties (fruit weight, fruit size, Juice volume, Juice weight and fruit Pulp Weight).

Influence of crop load on the yield and grape quality of Merlot and Vranac (Vitis vinifera L.) varieties in Trebinje vineyard

“…These results are inconsistent with most other studies (Petri and Clingeleffer, 2006;Reynolds et al, 2007;Brighenti et al, 2017;Drenjančević et al, 2017). Khamis et al (2017) noted the grape quality parameters have inverse correlation with the number of buds per vine, that is, the lower crop loads increase the total soluble solids and phenolic content. Positive correlation between lower crop load levels and total soluble solids or phenolic contents in grape has been reported in many other studies (Peña-Neira et al, 2007;Gil-Muñoz et al, 2009;Bubola et al, 2011).…”