CANOPY CHARACTERISTICS AND YIELD OF CERTAIN YELLOW MAIZE HYBRIDS AS INFLUENCED BY PLANT DENSITY
MAHMOUD BAYOUMY ABDEL-GAWAD EL-KOOMY;
Abstract
The response of canopy structure and yield of four yellow maize hybrids to six plant density treatments ranging from 19048 to 33333 plants/fed was studied.
1. Leaves area attained their maximum values at a level of more than 155 em
from soil surface in SC hybrids (SC 155 and SC 156) and less than 150 em in TWC hybrids (TWC 351 and TWC 352). Number of leaves was concentrated . at lower strata from soil surface in SC hybrids than those of TWC hybrids, LAI and SLA, followed similar trend.
2. Ear leaf angle for plants grown at 25 em between hills was greater than those planted at 20 or 30 em apart Flag leaf angle followed opposite trend where that of 25 em apart was smaller than those at 20 or 30 em apart, SC hybrids showed erectophilic shape compared to TWC hybrids.
3. Dry weight of the different yellow maize hybrids at different stalk strata increased as ridge width increased from 60 to 70 em or intra-ridge spacing
increased from 20 to 30 em.
. .
4. Yellow maize hybrids differed significantly in their dry weight of leaves,
stems, tassel and ears. Dry weight of whole plant and its organs increased remarkably by increasing plant age from 60 to 80 days after planting.
5. TWC 352 showed highest values of RGR (0.25 and 0.20 g/g/week), CGR (34.7 and 39.4 g/m'/week) and NAR (50.3 and 57.67 mg/cm'/day) in 1'' and
2"• growing seasons, respectively followed by TWC 351, SC 155 and SC
156 cultivars. Dry weight of maize organs increased significantly at thin planting as compared with dense one at 60 and 80 days age.
6. Ears of SC 155 hybrid were located at upper heights from soil surface followed by TWC 351, TWC 352 and SC 156 hybrids. SC 156 hybrid gave longer ears than other hybrids. Number of rows/ear and number of grain/ear
1. Leaves area attained their maximum values at a level of more than 155 em
from soil surface in SC hybrids (SC 155 and SC 156) and less than 150 em in TWC hybrids (TWC 351 and TWC 352). Number of leaves was concentrated . at lower strata from soil surface in SC hybrids than those of TWC hybrids, LAI and SLA, followed similar trend.
2. Ear leaf angle for plants grown at 25 em between hills was greater than those planted at 20 or 30 em apart Flag leaf angle followed opposite trend where that of 25 em apart was smaller than those at 20 or 30 em apart, SC hybrids showed erectophilic shape compared to TWC hybrids.
3. Dry weight of the different yellow maize hybrids at different stalk strata increased as ridge width increased from 60 to 70 em or intra-ridge spacing
increased from 20 to 30 em.
. .
4. Yellow maize hybrids differed significantly in their dry weight of leaves,
stems, tassel and ears. Dry weight of whole plant and its organs increased remarkably by increasing plant age from 60 to 80 days after planting.
5. TWC 352 showed highest values of RGR (0.25 and 0.20 g/g/week), CGR (34.7 and 39.4 g/m'/week) and NAR (50.3 and 57.67 mg/cm'/day) in 1'' and
2"• growing seasons, respectively followed by TWC 351, SC 155 and SC
156 cultivars. Dry weight of maize organs increased significantly at thin planting as compared with dense one at 60 and 80 days age.
6. Ears of SC 155 hybrid were located at upper heights from soil surface followed by TWC 351, TWC 352 and SC 156 hybrids. SC 156 hybrid gave longer ears than other hybrids. Number of rows/ear and number of grain/ear
Other data
| Title | CANOPY CHARACTERISTICS AND YIELD OF CERTAIN YELLOW MAIZE HYBRIDS AS INFLUENCED BY PLANT DENSITY | Other Titles | تأثير كثافة النباتات على صفات الكساء الخضرى ومحصول هجن معينة من الذرة الشامية الصفراء | Authors | MAHMOUD BAYOUMY ABDEL-GAWAD EL-KOOMY | Issue Date | 2000 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| محمود بيومى.pdf | 1.22 MB | Adobe PDF | View/Open |
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