العلاقة بين نمو الجذر و حاصل العصفر بتأثير فترات الري و مستويات البوتاسيوم

Abstract EN

The study was conducted at experimental field of Field Crops sciences Department – College of Agriculture – University of Baghdad during two seasons (2007-2008).

The objective of the study was to investigate the influence of irrigation interval and potassium levels on root growth of safflower variation.

Almaiss, and the relationship with yield and yield component characters.

The study was carried out according to Split Plot arrangements by using Randomized Complete Block Design including four replicates.

Irrigation treatments were 2, 4 and 6 week intervals in addition to control (un-irrigated).

These treatments occupied the main plots, while the subplots were occupied by potassium (K2SO4) levels (0, 100, 200, 300 and 400) kg/ha.

Results showed superiority of irrigated over un-irrigated.

Four – weeks interval irrigation was superior in giving the highest root length (28.8 and 27.85) cm and harvest index (41.68 and 50.11)% for two years respectively.

Furthermore, the same treatment was superior in head number (80.39 and 76.7) heads/plant and 300 seeds-weight (12.36 and 55.25) gm for two years respectively.

Dry matter weight increased from 295.95 to 308.4 gm/plant that confirmed the improvement of System Capacity Constant since it gave the highest plant yield (104.9 and 143.8) gm for two years respectively.

Plants of this treatment were characterized by their efficiency in light and Co2 assimilation as it gave the highest efficiency (410.42 and 493.73) gm/cm2 .Fertilization with 400 kg/ha gave the highest root weight (28.75 and 140.19) cm, seed number per head (54.81 and61.13), 300 seeds-weight (13.22 and 13.44) gm, plant yield (115.91 and 167.50 )gm/plant, dry matter yield (258.94 and 286.06)gm/plant , Harvest Index (44.01 and 55.91%) and yield efficiency (461.62 and 580.12) gm/cm2.