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Field experiments were conducted at Sakha, Kafr El-Sheikh, Egypt; to investigate the effect silica combined with mineral nitrogen on rice yield, and stem borer Chilo agamemnon Bles. Applying potassium ore combined with 92 kg N/fed. Produced the highest panicles/m (814.31) compared to other silica applications or lower nitrogen levels. The same trend was observed with panicle weight. One-thousand grain weight was higher in Egyptian hybrid 1 than in Giza 178. The grain yields were also highest with potassium ore for both cultivars at the rate of 92 kg N/fed. Rice stem borer infestation was higher in hybrid than in inbred cultivar. Both dead hearts and white heads gradually increased by the increase of nitrogenous applications; from 2.65 to 4.14 % dead hearts, and from 3.77 to 5.59 % white heads due to nitrogenous increase from 23 to 92 kg/fed., respectively. The highest dead hearts (4.92 & 5.28) and white heads (9.42 & 7.06 %) were detected in plots without silica. From the data of this experiment, it could be concluded that Egyptian hybrid 1 yielded more than Giza 178, particularly with using 92 kg N/fed., combined with potassium ore at 500 kg/fed.. It was found that silica applications reduced the stem borer infestation, regardless of the cultivar and nitrogen rates.

Combined Effect of Silica Applications and Nitrogen Fertilizers on Two Rice Cultivars and Infestation Rate by Stem Borer, Chilo agamemnon Bles