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 the response of the three maize hybrids productivity to different combination between nitrogen and potassium fertilizer and its effect to infection by fungal diseases. 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 subplots 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, 288 kg N/ha + 0 kg K/ha, 288 kg N + 57.6 kg K/ha, 288 kg N + 115.2 kg K/ha, 384 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 subplot consisted of 6 ridges 3.50 m in length and 70 cm in the width and plot area was 14.7 m2. The results revealed that maize hybrids differed significantly and combination between nitrogen and potassium fertilizer affected significantly in plant height (cm), ear length, number grains/row, number of grains/ears, 100- grain weight, grain, straw, and biological yield (kg/ha.) as well as harvest index %. The results indicated that there was significant effect of fertilization levels on yield, its components and leaf blight infestation of some maize hybrids where fertilizing maize hybrid TWC321 by 288 kg N + 57.6 kg K/ha recorded the highest values of yield and its components, on the other hand, the maize hybrid TWC321 recorded the highest yield and high tolerant for leaf blight under Alexandria conditions.
Highlights
Maize (Zea mays L.) is one of the three most important cereal crops in Egypt and the world
The results revealed that maize hybrids differed significantly and combination between nitrogen and potassium fertilizer affected significantly in plant height, ear length, number grains/row, number of grains/ears, 100- grain weight, grain, straw, and biological yield as well as harvest index %
Maize Hybrids Response to Nitrogen, Potassium Fertilization. This investigation aimed to study the response of the three maize hybrids productivity to different combinations between nitrogen and potassium fertilizer and its relation to some fungal diseases
Summary
Maize (Zea mays L.) is one of the three most important cereal crops in Egypt and the world. It is one of the important cereal crops next to wheat and rice in the world and it is high yielding, easy to process, readily digested and cheaper than other crops Maize is consumed both as food and fodder and in addition, it is required by the various industries. Potassium is an important macronutrient for improving the yield of crop It is vital for physiological processes, water availability, photosynthesis, assimilate transport and enzyme activation with a direct effect on crop production. Spores of the fungus develop abundantly on both sides of the spot (Singh et al, 2012) This investigation aimed to study the response of the three maize hybrids productivity to different combinations between nitrogen and potassium fertilizer and its relation to some fungal diseases
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