EFFECT OF DEFOLIATION ON GROWTH AND YIELD COMPONENTS OF TWO SORGHUM GENOTYPES | ||
| Journal of Plant Production | ||
| Article 1, Volume 31, Issue 11, November 2006, Pages 6809-6823 PDF (4.74 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2006.236357 | ||
| Author | ||
| A. E.A.A. Mourad, | ||
| Agric. Res. CeriterFie1d Crops Res. Inst.- Sorghum Depart. | ||
| Abstract | ||
| Two field experiments were conducted at Shandaweel Agric. Res. Station in Sohag, Egypt during 2002 and 2003 seasons. The aim was to identify the effect and contribution of indMdual leaves removal from flag leaf through the 6 leaf and 7 leaf to down (old Leaves) as well as control treatment (without defoliation). These treatments were applied on two sorghum genotypes Dorado and Shandaweel 2 hybrid The obtained results indicated that removing any leaf from plant significantly decreased head dry weight, grain weight/plant, fodder weight/plant, 1000 kernel weight, number of grains/head leaves dry weight, stem dry weight and total biomass compared to control treatment. The highest depressions percentage (DP) in head dry weight, grain weight/plant, fodder weight/plant, 1000 kernel weight, leaves dry weight and total biomass were observed with removing 7 leaf to down while number of grains /head and stem dry weight were highest depressed with removing the 4 leaf treatment. On the other hand, the contribution of leaf area unit (LUC) revealed that the highest contribution displayed by the flag leaf followed by 2°- leaf in head dry weight, grain weight/plant, fodder weight/plant, 1000-kernel weight, number of grains /head and total biomass. While nearly equal LUC values were obtained in leaves dry weight and stem dry weight by removing flag or 2 lear Whereas, the lowest LUC values in head dry weight, grain weight/plant, fociuer weiht/plant, number of grains/head, stem dry weight and total biomass by removing 7- leaf to down. Also, removing 5 leaf gave lowest LUC values in 1000- kernel weight and leaves dry weight. Shandaweel 2 hybrid ‘ias higher than Dorado variety in most growth and yield traits. Partial regression coefficients were significant for grain number/head by removing leaf, grain weight/head by removing each of flag, and 7 leave to down, head weight by defoliation each of , 4g” and 7th to down and 1000-kernel weight by removing each of flag, 2, 6th and 7hh leaves to down. Partial regression coefficient was significant for fodder weight/plant while the reverse was true for plant height. | ||
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