Agricultural studies on some corn hybrids cultiva ted with different plant densities
2011
Rabbani, B.G.
Two field experiments were carried out at the Agric. Exp. Sta., Fac. Agric., Cairo Univ., Giza, during 2009 and 2010 seasons to study the response of three hybrids of maize, Zea mays L. (S.C. 10, S.C. 122 and T.W.C. 321) to four plant densities (4.76, 5.56, 6.67 and 8.33 plants/m² on grain yield and yield components. Significant differences were found in both seasons between maize hybrids in plant height, number of ears/plant, barren plant, LAI, number of kernels/row, grain weight/ear and grain yield/plant. Likewise, number of rows per ear, number of ears/plant, number of kernels per row, grains weight/ear, seed index, shilling percentage and grain yield/plant significantly decreased by increasing plant density (Plant height, barren plant, LAI and grain yield per hectare significantly increased by increasing plant density from 4.76 plants/m² to 8.33 plants/m²]. The highest grain yield/ha (9.96 and 10.32 ton/ha) were obtained by planting 8.33 plants/m² in 2009 and 2010 seasons respectively. The lowest 7.88 and 8.28 tons/ha were recorded by planting 4.76 plants/m² in 2009 and 2010 seasons respectively, while planting 6.67 plants/m² and 5.56 plants/m² were intermediate in grain yield/ha. Increasing plant density from 4.76 plants/m² to 8.33 plants/m² increased grain yield/ha by 25.70 and 24.98 % in 2009 and 2010, respectively, while this increase reached 11.09 and 8.05 % for plant density of 6.67 plants/m² in 2009 and 2010 seasons. The effect of the interaction between hybrids and plant density on yield and yield components were not significant for all characters except number of ears/plant, LAI and grain yield/plant.
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