Yield and nitrogen use efficiency of two rice cultivars of different growth durations under algalization and splitting of two N fertilization levels [electronic resource].

Includes references.

A short durated (Giza 177) and a medium durated (Sakha 101) rice cultivars were grown in separate experiments at the Experimental Farm of the Faculty of Agriculture at Zagazig for two seasons (1998 and 2000). Seedlings of one month old were transplanted in algalized and unalgalized main plots where two N levels (30 and 60 kg NlFad) were tried in four different splitting patterns (three equal splits before transplanting, one and two months later; two splits as 2/3 before transplanting and 1/3 one or two months later; 2/3 one month after transplanting and 1/3 one month later) compared with a check N treatment. Giza 177 (125 days) out yielded Sakha 101 (140 days) in grain yield due to a more productive tillering and a stronger grain sink. The former had also better ~in quality and as weD higher N apparent recovery but lower N agrophysiological, physiological, and utilization efficiencies than. the latt"r. Algalization was without significant infl\lence on grain yield or on N use efficiency attributes. However, the addition of the first N increment was effective on aD these aspects where the N apparent recovery efficiency was increased.

Summary in Arabic.

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