EFFECT OF NITROGEN AND POTASSIUM FERTILIZATION ON NUTRITIONAL STATUS AND FRUIT QUALITY OF CITRUS TREES IN CASE OF CONVERTING IRRIGATION SYSTEM FROM FLOOD TO PRESSURIZED IRRIGATION SYSTEMS | ||||
Zagazig Journal of Agricultural Research | ||||
Article 10, Volume 44, Issue 6, November 2017, Page 2147-2163 PDF (279.87 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/zjar.2017.51255 | ||||
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Authors | ||||
Abdel-Baset A. Ibrahim 1; S. M. Dahdouh2; F. A. El-Azizy1; A. E. El-Sherbieny2 | ||||
1Micro. and Soil Fertility Dept., Des. Res. Cent., Cairo, Egypt | ||||
2Soil Sci. Dept., Fac. Agric., Zagazig Univ., Egypt | ||||
Abstract | ||||
Two field experiments were conducted at Salheya area, Sharkia Governorate, Egypt during two seasons (2015 and 2016) to study the effect of N, K fertilization and irrigation systems on citrus trees (Citrus sinenis), in case of converting irrigation system from flood to pressurized irrigation systems. Two N rates (800 and 1000g N/tree/year) and K (330 and 500 g K/tree/year) in the experiment 1 using 8 pressurized irrigation systemsbeside flood irrigation. Three N rates (800, 1000 and 1200 g N/tree/year) and K (330,500 and 660 g K/tree/year) in experiment 2 under 6 irrigation systems using equal water amounts for all converted trees (25 m3/tree/year) by using small valves, and flood irrigation. 800 g N/tree/year and 330 g K/tree/year gave the highest N content in leaves in trees converted from flood to two lines dripper (S7), Highest K content in leaves was obtained by treatment of 1000 g N and 500 gK/tree/year under non converted trees (flood). In experiment 1, highest content of total soluble solids (TSS) was obtained by 800 g N and 500 g K under trees converted from flood to Micro Jet in circle shape (S5), and the highest acidity pH was obtained by treatment of 1000 g N and 500 g K under trees converted from flood to S7. In experiment 2 the highest N content in leaves was obtained by treatment of 1200 g N/tree/year and 660 g K/tree/year in converted trees to (S5) and the highest content of K in leaves was obtained by treatment of 1200 g N/tree/year and 330g K/tree in converted trees to T. dripper in square shape (S4). Application of 1000 g N/tree/year with 500 g K/ tree/year gave the highest percentage of TSS, and the highest percentage of total acidity was obtained due to adding of 1200 g N combined with 330 g K/tree/year in converted trees from flood to (S5). | ||||
Keywords | ||||
citrus; nitrogen; potassium; irrigation systems | ||||
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