الفهرس 
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Abstract
Two field experiments were conducted at the Experimental Farm of Faculty of
Agriculture (Saba Basha), Alexandria University, Egypt during 2017 and 2018 seasons, to
study response of the three maize hybrids productivity to different combination between
nitrogen and potassium fertilizer and its relation to some fungal diseases.
The preceding crop was Egyptian clover (berseem) in the first season and second
season.
Split plot design with three replications was used, where the main plots occupied by
three hybrids of maize (S.C.10, S.C.131 and T.W.C.321), meanwhile the sub plots contained
combination between nitrogen and potassium fertilizer forms (192 kg N/ha + 0 kg K/ha, 192
kg N + 57.6 kg K/ha, 192 kg N + 115.2 kg K/ha, 120 kg N/ha + 0 kg K/ha, 288 kg N + 57.6
kg K/ha, 288 kg N + 115.2 kg K/ha, 160 kg N/ha + 0 kg K/ha, 384 kg N + 57.6 kg K/ha, and
384 kg N + 115.2 kg K/ha). Each sub plot consisted of 6 ridges 3.50 m in length and 70 cm
in the width and plot area was 14.7 m2.
The main results were summarized as follows:
5.1. Growth characters:
The hybrid TWC321 achieved the highest mean value of leaf area index (4.1 and 4.4)
as compared with the others two hybrids in both seasons.
Application of the rate of 384 kg N + 57.6 kg K/ha achieved the highest mean value
of LAI (4.4 and 4.7) followed by the rate of 288 N kg + 57.6 Kg K/ha, while the
lowest one (3.0 and 3.3) was observed with adding 192 kg N + 0 kg K kg/ha in both
seasons.