DAWOOD, S., EL-HAMADY, M., EL-SIADA, S., HAMISSA, A. (2001). 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, 79(3), 1059-1073. doi: 10.21608/ejar.2001.320030
SAMY A. DAWOOD; MOSTAFA M. EL-HAMADY; SAMER A. G. EL-SIADA; ABDEL-MONEM M. HAMISSA. "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, 79, 3, 2001, 1059-1073. doi: 10.21608/ejar.2001.320030
DAWOOD, S., EL-HAMADY, M., EL-SIADA, S., HAMISSA, A. (2001). '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, 79(3), pp. 1059-1073. doi: 10.21608/ejar.2001.320030
DAWOOD, S., EL-HAMADY, M., EL-SIADA, S., HAMISSA, A. 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, 2001; 79(3): 1059-1073. doi: 10.21608/ejar.2001.320030
RESPONSE OF WASHINGTON NAVEL ORANGE TREES GROWN ON SLIGHTLY ALKALINE CLAY SOILS TO MAGNESIUM RATES, METHODS AND NUMBER OF APPLICATIONS
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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