الفهرس 
Plant growth charactersOnly 14 pages are availabe for public view
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Abstract
The present investigation was carried out at Etai-El-Baroud- Agricultural Research Station, Agriculture Research Center (ARC) during 1991, 1992 and 1993 rice seasons. This investigation aimed to study the effect of zinc application under different nitrogen levels on growth, grain quality and yield and its Components of rice.This work was studied under the parts following two titles:- I- Effect of different nitrogen levels and different zinc sources on transplanted rice. 11- Effect of different nitrogen levels and zinc methods of application on broadcast-seeded rice. A Split plot design with four replication was used in all experiments. The main plots were Randomly assigned to three nitrogen levels i.e. 48,96 and 144 Kg N/ha, while the sub plots were received three different Zinc sources as well as the control and four different Zinc methods of applications as well as the control in first and second part of this work Giza 176 was used in all experiments of this investigation. Central 10 m2 from each plot was harvest for yield determination. Yield and its Components,Chemical Composition, grain quality and other Parameters were recorded . The results Obtained could be Summarized as follows:- lant growth characters: I-a-Plant height: Plant height was increased significantly as the nitrogen fertilizer increased up to 144 Kg N/ha, at all three seasons in both experiments.144 Kg N/ha gave the highest value compared with 48 and 96 Kg N/ha at all seasons under study. On the other hand different methods of zinc application and zinc sources affected significantly on plant height at all three seasons under study and the interaction between nitrogen rates and different zinc sources in the first experiment and zinc methods of application in the second experiment affected significantly on plant height in all seasons of study. 1 -b-Num ber of tillers/m2: Significant increased in the number of tillers/m2 was recorded with the application of nitrogen fertilizers up to 144 Kg N/ha in all season of study and fertilized rice plants with 144 Kg N/ha Increased number of tillers/m2 in all seasons of study compared by 48 and 96 Kg N/ha. Further more there is a significant Zinc sulfate gave the highest number of tillerslhill compared with other zinc sources on the other hand Zinc Oxide gave the lowest value at all seasons of study. Concerning the effect of interaction between nitrogen levels and different zinc sources there is a significant effect on this character at all seasons of study. Zinc sulphate gave the height, value when rice plants fertilized by 144 Kg N/ha. I -c-Num ber of ~anicles/m~: The total number of panicles/m2 was significantly affected by nitrogen rates and different zinc sources and methods of zinc application at all seasons. Significant increase of the number of panicle/m2 was recorded with the application of nitrogen fertilizers up to 144 Kg N/ha in all seasons of study in the first experiment different zinc sources significantly affected in number of panicles/m2, zinc sulphate gave the highest value and the interaction between nitrogen rates and zinc sources when rice plants fertilized with 144 Kg N/ha and treated by zinc sulphate it gave the highest value of total number of panicles/m2 while in the 2nd experiment increasing nitrogen rate up to 144 Kg N/ha gave the highest value and soil application gave the highest value, whiie spray at maximum tillering gave the lowest number of panicleslm2. Concerning the interaction the highest number was obtained when rice plants fertilized by 144 Kg N/ha. and treated by zinc as a soil application method.