Abstract
Conservation tillage systems that maintain crop residues on soil surface is being suggested as an alternative to conventional tillage system that encourages soil erosion and decline in crop yield with time. Trials were conducted in 1993 and 1994 to investigate the effect of two tillage practices (conventional and no-tillage) and three nitrogen (N) fertilizer levels (0, 50kg N ha-1 and 100kg N ha-1) on growth rate and grain yield of maize hybrids (Hybrid 8522-2 and 8644-3) and TZPB-SR(check). At 0kg N ha-1 under conventional tillage, growth rate varied from 0.44g-day-1 at 0-10 days after planting to 1.12g day-1 at 24-38 days after planting. Similar increases in growth rate were observed at 50kg N ha-1 and 100kg N ha-1. Significant interactions were recorded between tillage practices, hybrids and N-rates for grain yield. Grain yields of the varieties (hybrids and check) were significantly higher under conventional tillage practice than the no-tillage practice. Under conventional tillage, grain yield of the hybrids increased from 2.5t ha-1 at 0kg N ha-1 to 4.7t ha-1 at 50kgNha-1 for hybrid 8522-2 and then dropped significantly to 3.25t ha-1 at 100kg N ha-1. On the basis of grain yield, use of hybrid varieties are recommended and under conventional tillage practice. Key Words: Conservation tillage; conventional tillage; growth rate; maize hybrids; grain yields Moor J. Agric. Res. Vol.4(1) 2003:26-36
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Claims 8
Claim · model-written summary
Under conventional tillage without nitrogen, maize growth rate rose from 0.44 to 1.12 g per day between the reported growth periods.
- Treatment
- 0kg N ha-1e0
- Outcome
- growth ratee0
- Direction
- variede0
- Value
- 0.44g-day-1e0
- Qualifier
- 1.12g day-1 at 24-38 days after plantinge0
- Setting
- conventional tillagee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 0kg N ha-1 under conventional tillage, growth rate varied from 0.44g-day-1 at 0-10 days after planting to 1.12g day-1 at 24-38 days after planting.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Maize growth rate also increased at 50 kg N per hectare.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar increases in growth rate were observed at 50kg N ha-1 and 100kg N ha-1.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Maize growth rate also increased at 100 kg N per hectare.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar increases in growth rate were observed at 50kg N ha-1 and 100kg N ha-1.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Tillage, hybrid and nitrogen rate interacted significantly for grain yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant interactions were recorded between tillage practices, hybrids and N-rates for grain yield.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Conventional tillage produced significantly higher grain yield than no tillage.
- Treatment
- conventional tillage practicee0
- Outcome
- Grain yieldse0
- Direction
- highere0
- Comparator
- no-tillage practicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields of the varieties (hybrids and check) were significantly higher under conventional tillage practice than the no-tillage practice.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Under conventional tillage, hybrid 8522-2 grain yield rose from 2.5 t/ha without nitrogen to 4.7 t/ha at 50 kg N/ha.
- Material
- hybrid 8522-2e0
- Treatment
- 50kgNha-1e0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 4.7t ha-1e0
- Qualifier
- 2.5t ha-1e0
- Comparator
- 0kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under conventional tillage, grain yield of the hybrids increased from 2.5t ha-1 at 0kg N ha-1 to 4.7t ha-1 at 50kgNha-1 for hybrid 8522-2 and then dropped significantly to 3.25t ha-1 at 100kg N ha-1.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
Under conventional tillage, hybrid 8522-2 grain yield fell significantly to 3.25 t/ha at 100 kg N/ha compared with 50 kg N/ha.
- Material
- hybrid 8522-2e0
- Treatment
- 100kg N ha-1e0
- Outcome
- grain yielde0
- Direction
- droppede0
- Value
- 3.25t ha-1e0
- Comparator
- 50kgNha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under conventional tillage, grain yield of the hybrids increased from 2.5t ha-1 at 0kg N ha-1 to 4.7t ha-1 at 50kgNha-1 for hybrid 8522-2 and then dropped significantly to 3.25t ha-1 at 100kg N ha-1.”
t0“maize (Zea mays l.) hybrids”
Claim · model-written summary
The authors recommend hybrid varieties under conventional tillage on the basis of grain yield.
- Outcome
- use of hybrid varieties are recommended and under conventional tillage practicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the basis of grain yield, use of hybrid varieties are recommended and under conventional tillage practice.”
t0“maize (Zea mays l.) hybrids”
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See all 2,185 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.