RESPONSE OF SOME GENOTYPES OF MAIZE TO NITROGEN LEVELS AND PLANTING DATES

Th. Al-Assafy, R.; M. Al-Jumaily, A.; J. Attya, H.

	RESPONSE OF SOME GENOTYPES OF MAIZE TO NITROGEN LEVELS AND PLANTING DATES
The Iraqi Journal of Agricultural Science
Article 1, Volume 37, Issue 2, 2006, Pages 75-80
Authors
R. Th. Al-Assafy; A. M. Al-Jumaily; H. J. Attya
Abstract
A field trial was conducted at the Field Crop Station of IPA Center in Abu-Ghraib during the spring and fall seasons of 2001. The objective was to know the response of some genotypes of maize to nitrogen levels and planting dates in yield and yield components. A split-split plot arrangement in RCBD with three replications was used. Planting dates were (Is, 19* March and 9th April) for spring season and (1st, 15th July and 1st August) for fall season, were the main plots, nitrogen levels (220,320 and 420 kg N/ha) were sub plots, and genotypes (IPA3001, IPA3003, IPA5012 and Buhooth 106) as sub-sub plots. The results showed that sowing at spring season in Is' March increased number of kernel per ear (74%) and grain yield (76%) as compared with sowing in 9th April .Sowing in the fall season (15 July) increased number of kernel per ear (28%), grain yield (26%) as compared with sowing in Ist July . Increasing nitrogen levels from 220 to 420 kg N/ha gave the highest mean of number of kernel per ear (18% and 13%), grain yield (25% and 16%) in both seasons, respectively. Genotypes IPA3001 and IPA3003 gave the highest means of number of grains per ear (11% and 4%) and grain yield (8.6% and 8%) for spring and fall seasons as compared with synthetic cultivars IPA5012 and Buhooth 106. Results indicated that maximum grain yield could be achieved by sowing IPA3003 during early March and mid July with 420 kg N/ha. which gave 12.6 and 13.7 t/ha for spring and fall seasons, respectively

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