Optimal Management of Nitrogen Fertilization in some Yield Traits of Corn Plant in Gypsum Soil

Abstract

Abstract A field experiment was conducted in the fields of the College of Agriculture - University of Tikrit during the autumn season for the year (2022) to find out the effect of nitrogen fertilizer fractionation on the growth of corn in gypsum soil.Where the experiment included three factors, the first factor, five dates for nitrogen fertilizer fractionation, symbolized by the letter T (T1, the first appointment / half of the quantity at planting and the other half after (30) days of planting, and T2, the second appointment / one-third of the quantity at planting and two-thirds after (30) days of cultivation and T3 third date / one-third of the quantity at planting and one-third after (30) days of cultivation and a third after the passage of (60) days of cultivation and T4 the fourth date / one-fifth of the quantity when planting, fifty-five after the passage of (30) days of cultivation and fifty after the passage of (60) days of cultivation and T5 the fifth date / two-fifths at planting and fifty after a month of cultivation and one-fifth of the quantity After the passage of (60) of cultivation. The second factor is two levels of nitrogen fertilizer, denoted by the symbol N, namely (N1) (320) kg N ha-1 and (2N) (360) kg N ha-1. The third factor is Adding method, denoted by the symbol M, the BroadcastingM1 method) and the Bands(M2) method. All the results showed that the retail treatment of the fourth appointment, T4, excelled in all traits, and the second level, N2 (360) kg N ha-1, gave the highest significant difference in all traits, and the addition of the second method, M2 (Bands method), also gave excelled in all studied traits.The results showed that the treatment T4N2M2 gave the highest values in the studied traits (the number of rows per ear, the number of grains per ear, the weight of 500 grains, and the total grain yield), as it reached (18.01) row cob-1, (739) grain cob-1, (163.01) gm, and (14.08)) ton ha-1, respectively.