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Abstract
Two field experiments were carried out in the summer seasons of
1991 and 1992 in private farms at El-Kassasin, Ismailia Governorate to
study the response of com hybrid 310 TWC. to 5 nitrogenous fertilization
levels and three planting densities. The five nitrogenous fertilizer levels
were 40, 60; 80, 100 and 120kgN/fad. The studied three planting
densities, were 17100, 21400 and 28600 plants/fad, these plant densities
were obtained by sowing maize seeds at 35, 28 and 21cm between each
two hills within row 70cm apart for the mentioned three densities,
respectively. The split-plot design in 4 replicates was made in use, where
the main plots were occupied by nitrogen fertilizer treatments, while sub-
plots were devoted for the three planting densities.
At 65 and 80 days from sowing, data were recorded on the
vegetative characters; plant height (em), leaf area per plant (rrr), leaf area
index (LAI) , the fourth leaf angle (from the top), specific leaf weight
(g/cm”) and total plant dry weight (g). At harvest, plant height (em), ear
length (ern), Number of grains per ear, grain weight per ear (g), shelling
percentage, 1000-grain weight (g) and grain yield/fad. (tons) were
recorded. Grain protein content (%), was also determined. The results
obtained, could be summarized as follows:
1- VEGETATIVE GROWTH CHARACTERISTICS:
1- Plant height (em):
Plant height significantly increased with increasing nitrogenous
fertilizer levels up to 120kgN/fad. That was true at 65 and 80 days from
sowing in each season and over them. Over the two seasons N,
(120kgN/fad.) did not differ significantly with N4 at 65 days from sowing.