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Effect of Alternate Bearing Phenomenon and Boron Foliar Application on Nitrogen-15 Uptake,Translocation and Distribution in Mango Tree(***)

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Journal of Botanical Research 2023年第4期5卷 11-22页

作者： Rawia El-Motaium Ayman Shaban El Sayed Badawy Ahmad Ibrahim Plant Researches Department Nuclear Research CenterAtomic Energy AuthorityInshasCairo13759Egypt Department of Pomology Faculty of AgricultureCairo UniversityGizaCairo12613Egypt Soil Science Department Faculty of AgricultureCairo UniversityGizaCairo12613Egypt

The objectives of this investigation are to study nitrogen uptake,translocation,accumulation and distribution in mango tree organs using labeled nitrogen(^(15)N)and to understand the mechanism of boron action in increasing fruit yield in the off-year.A field experiment was conducted using fifteen-year-old mango trees(***)grown at Al Malak Valley Farm,El-Sharkeya *** included the application of(^(15)NH4)2SO4,“in the on-year”,at a rate of 50 g nitrogen/tree through the stem injection *** boron was sprayed on the same trees“in the off-year”at the following rates:0.0(control),250 and 500 mg·L^(-1).The authors hypothesize that boron and nitrogen act synergistically to increase mango fruit yield in the *** indicated that the highest ^(15)N uptake and accumulation in the on and off-years was observed in the upper(young leaves).When boron was applied at 250 mg·L^(-1),in the off-year,the upper(young leaves)recorded the highest ^(15)N uptake and accumulation(%^(15)Ndff=13.93)relative to the other two leaf categories and those of the *** the on-year fruit accumulated higher ^(15)N than leaf or *** the off-year,bud exhibited the highest ^(15)N accumulation without boron application,while leaves exhibited the highest ^(15)N with boron *** highest%^(15)Ndff in all tree organs was observed at 250 mg·L^(-1) boron *** increased nitrogen uptake,translocation and accumulation in mango tree organs.A synergistic relationship was observed between boron and nitrogen which led to an increase in fruit yield in the off-year.

关键词： Mango ^(15)N distribution ^(15)N-stem injection technique ^(15)N translocation ^(15)N uptake,^(15)N accumulation on and off-year Synergistic relationship

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