To determine the suitable level of phosphorus fertilization and the best seeding rate in (Vigna mungo L.), CV. (Khadrawy) under kerbala province environment. A field experiment was conducted at husaniah/ College of agriculture during the growing season of 2005/ 2006 and 2006/ 2007, using split plot design with RCBD in three replicates. Three levels of phosphorus fertilization (15, 30 and 45) kg P/ ha were assigned in the main plots, whereas seeding rates (24, 36, and 48) kg/ ha as sub plots.
The suitable fertilization level was produced in 15 kg P /ha with most studied characters, excluding seed weight and no. of plants/ m2. Increasing level of phosphorus to 45 kg P/ ha decreased seed yielding in percentage (16.65 and 26.45) % at the first and the second season respectively. Increasing level of phosphorus fertilization caused significant increase in seed weight because of the yield component compensation which produced from decrease no. of pods/ m2 and no. of seeds/ pod. The best seeding rate was 36 kg/ ha in characters of no. of plants/m2, leaflet area, no. of pods/ m2 and seed yield which gave (1198.40 and 1060.10) kg/ ha at the first and the second season respectively. The highest interaction was obtained from 15 kg P/ ha in second season (1187.7) kg/ ha, while the first season was not signification interaction. The highest percentage of determination of coefficient was from leaflet area and no. of pods/ m2 which were (71and 58) % respectively for first season and (60 and 50) % respectively for second season.