EI-Ashry,, S. (2002). EFFECT OF VARIOUS ZINC SOURCES AND RATES ON ZINC AND SOME NUTRIENTS CONTENTS OF RICE. Journal of Soil Sciences and Agricultural Engineering, 27(4), 2775-2786. doi: 10.21608/jssae.2002.254168
Soad M. EI-Ashry,. "EFFECT OF VARIOUS ZINC SOURCES AND RATES ON ZINC AND SOME NUTRIENTS CONTENTS OF RICE". Journal of Soil Sciences and Agricultural Engineering, 27, 4, 2002, 2775-2786. doi: 10.21608/jssae.2002.254168
EI-Ashry,, S. (2002). 'EFFECT OF VARIOUS ZINC SOURCES AND RATES ON ZINC AND SOME NUTRIENTS CONTENTS OF RICE', Journal of Soil Sciences and Agricultural Engineering, 27(4), pp. 2775-2786. doi: 10.21608/jssae.2002.254168
EI-Ashry,, S. EFFECT OF VARIOUS ZINC SOURCES AND RATES ON ZINC AND SOME NUTRIENTS CONTENTS OF RICE. Journal of Soil Sciences and Agricultural Engineering, 2002; 27(4): 2775-2786. doi: 10.21608/jssae.2002.254168
EFFECT OF VARIOUS ZINC SOURCES AND RATES ON ZINC AND SOME NUTRIENTS CONTENTS OF RICE
Soils and Water Use Dept., National Research Centre, Dokki, Cairo, Egypt.
Abstract
A pot experiment was conducted to study the effects of different application sources i.e. Zn S04 7H20, Zn CI2 and Zn-EDTA and rates nemly, 1.5, 3.0, 6.0 and 12.0 mg/kg soil of Zn on grain and straw yield of rice (Giza 178), rice grain Zn content and distribution of zinc fractions and their transformation in rice soils during the growing season.
The obtained results showed that the different sources of Zn increased the yield of grain and straw as compared with the control. But, ZnS04.7HzO had slightly effective less than ZnEDTA and ZClz sources. Also, the yield was affected by the different rates of Zn sources. Data indicated that the highest increase (85 %) of grain yield was obtained at 6 mg Zn rate, while the highest increase (130 %) of straw yield was obtained at 12 mg Zn.
The macronutrients N, P and K uptake by grain and straw and its Zn concentrations increased by the studied Zn sources additions.
The highest increases in straw Zn concentration were obtained with ZnEDTA and ZnClz sources. But, the highest increases in grain Zn concentrations were obtained with ZnS04.7H20 sources. Generally, the 6 mg Zn.kg-' soil rate was the best treatment.
The Zn contents of soil through the growing season were chemically fractionated into: water soluble and exchangeable (Zn-CA), weakly bound to inorganic sites (Zn-ACC), organically bound (Zn-pYR), occluded as free oxide material (Zn-OX), and residual (Zn-Res) mainly in the mineral structure. These fractions constituted ranged form, 0.2 to 7.4, 2.9 to 17.5, 1.0 to 20.0, 3.9 to 18.3 and 54.2 to 85.9 % of the total soil Zn respectively which ranged from 95.5 to 333.8 rnq.kq",
Therefore, it could be concluded that the application of Zn EDTA source at 6 mg Zn. Kg-' soil rate was sufficient to produce a high rice yield and increase grain Zn- uptake.
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