RESPONSE OF WASHINGTON NAVEL ORANGE TREES GROWN ON SLIGHTLY ALKALINE CLAY SOILS TO MAGNESIUM RATES, METHODS AND NUMBER OF APPLICATIONS | ||||
Egyptian Journal of Agricultural Research | ||||
Article 20, Volume 79, Issue 3, September 2001, Page 1059-1073 PDF (3.88 MB) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/ejar.2001.320030 | ||||
View on SCiNiTO | ||||
Authors | ||||
SAMY A. DAWOOD1; MOSTAFA M. EL-HAMADY2; SAMER A. G. EL-SIADA1; ABDEL-MONEM M. HAMISSA3 | ||||
1Horticulture Research Institute, Agricultural Research Center, Dokki, Giza, Egypt | ||||
2Faculty of Agriculture, Kafr El-Sheikh University, Tanta, Egypt | ||||
3Soils, Water and Environment Institute, Agricultural Research Center, Giza, Egypt | ||||
Abstract | ||||
The response of mature Washington Navel orange trees to Mg SO4, soil (0.5, 1.0 and 1.5 Kgs / tree / year) or foliar (1.0, 1.5 and 2.0 % / tree / year) applications, each added at 1, 2 and 3 times of application was investigated in two successive seasons (97/1998 and 98/ 1999), at Biyala citrus orchard, where the soil is classified as slightly alkaline clay soil, exchangeable Mg 22 mg/100g soil and mean leaves Mg concentration (D.W) was ❑.136%. Yield as Kgs and fruit number was increased by all Mg SO4 rates, methods and numbers of application, but the highest significant increase was obtained by 1.5% (spray) or 1.0 Kg (soil application) Mg SO4 / tree / year added 3 times annually for foliar and soil application, respectively. Moreover, the highest average fruit weight, TSS, vitamin C, juice volume and lowest acidity were obtained by Mg SO4 foliar spray 3 times, while peel thickness was unaffected. Magnesium treatments markedly increased leaf area, shoot length and numbers, total chlorophyll and Mg %, but slightly increased F', Fe, Mn, and Zn. leaf Ca and K content were decreased, whereas, N was unaffected. Generally, spraying Mg SO4 gave the highest values for yield, fruit quality vegetative growth, chlorophyll and total carbohydrate percent. The best treatment is spraying 1.5% or adding 1.0 Kg soil application Mg SO4/tree/year three times annually, but the superior treatment is spraying trees with 1.5% Mg 804. | ||||
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