الفهرس 
Maize growth attributesOnly 14 pages are availabe for public view
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Abstract
Two field experiments were carried out at a private farm (newly
reclaimed soil) at Somusta city, Beni- Suif Governorate, Egypt, during
2014 and 2015 growing seasons. These experiments aimed to evaluate the
application of different nitrogen sources and their combinations for
increasing the productivity and quality of yellow maize (Zea mays).
Results showed that:
Maize plants fertilized with 120 kg mineral nitrogen (MN)/fad.
recorded the maximum leaves number/plant (12.67) and number of green
leaves /plant (12.67) after 45 days from sowing. However, the application
of 60 kg MN/fad + 60 kg organic nitrogen as poultry manure (ONP) /fad
gave the maximum number of leaves /plant (15.17 and 17.83) and number
of green leaves /plant (15.17 and 16.33) at stages of vegetative growth
after 60 and 75 days from sowing, respectively. Application of 60 kg
MN/fad + 60 kg ONP /fad gave the highest values of leaf area index
(LAI) 3.16, 3.98 and 6.39 at all stages of vegetative growth i.e 45, 60 and
75 days from sowing, respectively.
At harvest maize plants fertilized with 60 kg MN/ fad + 60 kg
ONP /fad recorded the highest value of grains number/row (32.83)
followed by 60 kg MN/fad + 60 kg organic nitrogen as compost
(ONC)/fad. the highest values of ears number/plant were recorded with
the treatments of 60 kg MN/ fad + 60 kg ONC /fad, 60 kg MN/fad + 60
kg ONP/fad and 60 kg MN/fad + 60 kg organic nitrogen as farmyard
manure (ONF)/ fad with the same value (2.00). Data also revealed that the
highest value of grain weight/plant (274.49gm.) was recorded at 60 kg
MN/fad + 60 kg ONP/fad treatment.
Application of 60 kg MN/fad + 60 kg ONP/fad produced
significant maximum grain yield (3.05 ton/fad.), biological yield (6.37
ton/fad) and grain crude protein yield (296.83 kg/fad).
Maize plants treated with 60 kg MN/fad + 60 kg ONP/fad gave
the highest values of grain and straw nitrogen percentage by 1.17 and
0.42% respectively. In addition the highest values of grain and straw
phosphor percentage (0.49 and 0.20 %) and potassium percentage (4.30
and 1.90%) respectively were recorded with 120 kg ONP/fad.
Keywords: Maize, organic farming, yield components, NPK, nitrogen
partitioning.