علاقة قطر الساق بعرض الورقة و تأثره بالتركيب الوراثي و مرحلة القطع للذرة البيضاء

الملخص EN

This search was conducted at the farm of Field Crops Department, College of Agriculture, Baghdad university, Abu- Ghraib., for two seasons (Spring and Autumn) of 2013, to determine the relationship between stem diameter and leaf width as affected by genotypes and cutting stages of Sorghum bicolor L.

Moench.

The genotypes were Sb-0, Sb-1, Sb-2, Sb-3, Sb-7, Sb-8, Sb-9, Sb-12, Sb-14, Sb-16 and Kaffir.

The cutting stages were growth stage, Cutting at 50% flowering, and cutting at 100% flowering.

Layout of the experiment was RCBD with four replications arranged in split-plot.

Cutting stages were used as the main plot while, the genotypes were used as sup-plot.

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The results showed that Sb-0 genotype significantly gave the highest rate of stem diameter( 18.03, 18.92 mm) and leaf width (17.80, 17.90 cm) for spring and autumn respectively.

While Sb-9 genotype significantly gave the highest tiller number / plant (3.95, 3.95 tiller/ plant) for spring and autumn respectively .The cutting stage 100% flowering significantly gave the highest rate of plant height( 168.45, 177.83 cm) and leaf area ( 3954.51, 4293.70 cm 2), leaf index( 7.91, 8.59), leaf width( 4.74, 4.80 cm), and stem diameter( 9.83, 10.08 mm) for spring and autumn respectively.

This study also showed that interaction between genotypes and cutting stages gave positive increased in plant height, leaf area, leaf index and leaf width for two seasons, The study also found that there were positive correlation between stem diameter and leaf width and negative correlation between tillers number and stem diameter