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Zagazig University (2000)

Efficiency of some micronutrient fertilizers as influenced by different nitrogen sources in some soils of Egypt

Bayoumi, Mohamed Said Awad

Titre : Efficiency of some micronutrient fertilizers as influenced by different nitrogen sources in some soils of Egypt

Auteur : Bayoumi, Mohamed Said Awad

Etablissement de soutenance : Zagazig University

Grade : Doctor of Philosophy (PhD) 2000

Résumé
This research aims at studying the efficiency of some micronutrients as influenced by application of different Nesources. The research involved, also throwing light on the effect of the micronutrients (Fe, Zn and Mn) combined with different N-sources on growth of wheat plants grown on soils of Shalateen and EI-Nobariea ( sandy and calcareous), respectively and their uptake ofN, Fe, Zn and Mn. To achieve these aims/a pot experiment was carried out under greenhouse conditions at Agriculture Research Center ( ARC ) using the collected soils. Each pot was packed with 5kg soi either Fe, Zn or Mn was added to the investigated pots in so,’ : or EDTA form combined with N in different forms ammonium sulfate ( AS 20.5 %N), tUIUnonium+N-serve(AS+N-serve 20.5 %N), Calcium nitrate( Ca(N03h 15.5% N ), urea ( U % N 46.5 ) sulfur coated urea (SeD %38 N) and ureafonnaldehyde ( UF % 40 N) as follows : The N-source + Fe ( 804 or EDTA) The N-source +Zn ( S04 or EDTA) The N-source + Mn (804 or EDTA) The growth parameters, dry weight (shoots and grains), N, Fe, Zn and Mn uptake were recorded. Tracer technique ( N15
- Isotopic dilution concept) was used to elucidate fertilizer use efficiency ( FUE % ) for the Studied nitrogen sources AS, AS+Nserve, urea and OF combined with Fe, Zn and Mn either in the mineral or chelated form. (SO/- or EDTA) The obtained results can be summarized as follows :- A-Effect of Fe in two forms ( SO : and EDTA) in absence or presence of different N-sources :- I-Addition of Fe (in 804 or EDTA form) to the sandy or the calcareous soils resulted in increase in total dry weight ( shoots+grains ) of wheat plants . 2- Total dry weight of wheat plants increased with application of Fe combined with N compared with Fe alone and the increase was more pronounced when Fe was applied in the chelated form. 3-Application of Ft in the chelated form combined with N as UP resulted in the highest dry weigtlts of wheat plants in both the sandy and the caJcareous. 4- Total N-uptake by wheat plants grown on the studied soils increased when Fe was applied in dither of its two forms compared with the control treatment. it This increase is more pronounced upon application of Fe in the chelated form. 5- Addition of Fe in tither of its two forms (804 or EDTA ) combined with the different N-sources increased total N-uptake by wheat plants grown on both the sandy and calcareous soils compared to the plants received Fe alone. The increase was more obvious by application Fe in the chelated form, 6- The highest value of total N-uptake by wheat plants grown on both the sandy and calcareous soils was observed when the plants received Fe -EDTA combined with N as UF and seu, respectively. 7- Application of Fe-EDTA increased Fe uptake by both shoots and grains of wheat plants grown on both the sandy and calcareous soils compared to the plants treated with FeS04 or the Fe non treated ones. 8-Iron application combined with the different N-sources increased its uptake. The chelating form resulted in more increase of Fe-uptake compared with FeS04, also the highest values of Fe-uptake were those of the wheat plants grown on the calcareous soil. 9-Total uptake of Zn and Mn by wheat plants slightly increased due to application of Fe ill its two forms either solely or in combination with the different N-sources. B-Effect of Zn in 1Iwoforms ( SO : and EDTA ) in absence or presence of different N-sources :•. I-Addition of Zn tin the SO ; or EDT A form to the sandy and calcareous soils resulted in increase total dry weight ( $hoots+grains ) of wheat plants . 2- Total dry weight Iofwheat plants increased with application of Zn combined with N compared th Zn alone and the increase was more pronounced when Zn was applied as a cbelated form. _ 3-Application of Zn in the chelated form combined with N as OF resulted in the highest dry weights of wheat plants grown on both the sandy and calcareous. 4 Total N-uptake by wheat plants grown on the studied soils increased when Zn was applied in either of its two forms compared with the control treatment. ”J The increase was more pronounced by applied Zn in the chelated form. 5-Addition of Zn in either of its two forms (SO : .. and :OTA combined with the different N-sources resulted in increased to up . heat plants grown on both the sandy and calcareous soils compared to-the pl ts received Zn alone. This increase was more pronounced by application of Zn in the chelated form. 6-The highest values of total N-uptake by wheat plants grown on the sandy and calcareous soils were attained when the plants received Zn-EDTA combined with N as OF and seu, respectively. 7- Application ofZn-EDTA increased Zn uptake by both shoots and grains of wheat plants grown on both the sandy and calcareous soils compared to those treated with ZnS04 or non treated ones. 8-Zinc application combined with different N-sources increased its uptake. The chelated form of Zn resulted in more increase than mineral one ( ZnS04). Also values of Zn-uptake by wheat plants arown on the calcareous soil were higher than those of the plants grown on the sandy soil 9-Total uptake of Fe and Mn slightly i,ncreased due to application ofZn in either of its two forms either solely or’mbination with different Nesources compared with not treated one (control).

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Page publiée le 1er février 2016, mise à jour le 20 juillet 2018