Abstract
Six experiments were performed in the term of three years in order to explore and compare the effects of transplanting and direct sowing (DS) on sweet corn (Zea mays L.) growth, earliness and yield. Different genotypes, tray cell sizes (volume) and seedling ages were assayed. In all experiments, direct sowing was performed with a final separation of 0.25 m between plants in each row. Growth parameters (height, leaf area and ear size) were reduced with the increase of age and/or decrease of the tray cell size, mainly in cultivars with early flowering i.e., low cumulative corn heat unit (CHU) requirements. Earlier harvests were obtained in transplanting compared to direct sowing, although with lower yields. When the thermal time accumulated by plants in the trays was higher than 100 CHU, the yield decreased by 3.91% (R2 = 0.79) for each unit of CHU. The results indicate that the transplanted sweet corn yield was generally lower than of direct seeded plants, and differences grew bigger as the tray cell volume was smaller and the seedlings age increased.
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Claims 5
Claim · model-written summary
Older seedlings or smaller tray cells reduced growth parameters, especially in early flowering cultivars.
Verbatim
e0“Growth parameters (height, leaf area and ear size) were reduced with the increase of age and/or decrease of the tray cell size, mainly in cultivars with early flowering”
t0“Sweet corn”
Claim · model-written summary
Transplanting led to earlier harvest than direct sowing.
Verbatim
e0“Earlier harvests were obtained in transplanting compared to direct sowing”
t0“Sweet corn”
Claim · model-written summary
Transplanting gave lower yields than direct sowing.
Verbatim
e0“Earlier harvests were obtained in transplanting compared to direct sowing, although with lower yields”
t0“Sweet corn”
Claim · model-written summary
Above 100 CHU in trays, yield declined by 3.91% per unit of CHU.
Verbatim
e0“When the thermal time accumulated by plants in the trays was higher than 100 CHU, the yield decreased by 3.91% (R2 = 0.79) for each unit of CHU”
t0“Sweet corn”
Claim · model-written summary
The transplant yield disadvantage increased with smaller tray cells and older seedlings.
Verbatim
e0“differences grew bigger as the tray cell volume was smaller and the seedlings age increased”
t0“Sweet corn”
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transplanting · yield · Zea mays (maize)Results differ
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