Effect of abscisic acid concentrations and stages of spray on maize growth, seed yield and germination at late planting

A field experiment was carried out in Al-Hajjaj district- Salah Al-Din Governorate, during the autumn season of 2021. The experimental design randomized complete block (RCBD) three replications. It had ABA concentrations 0, 9 and 12 mg L-1 that sprayed on plants at 4 8 leaves beginning flowering. Results indicated a concentration superior shortening number days from sowing until 50% tasseling (male flowering) 38.33 silking (female 41 days. same recorded highest stem diameter 2.47 cm, seeds per ear 682.89 seed ear-1, 1000 weight 373.77 g, single plant yield 165.64 g 11.04 tons ha-1, protein content 9.80% ash percentage 1.39%. However, control germination speed 95.89 64.80, respectively. Spraying recording least planting 38.50 43.55 also excelled giving 2.35 cm. foliar application flowering showed means 664.99 361.80 158.70 10.57 10.03%, 1.36%. Hence, spray mean 84.81 speed.