Abstract
A two-year field experiment was conducted to study the effect of four rates of nitrogen fertilizer (0, 107, 214 and 321 kg N ha -1 ) on six maize single crosses (SC 10, SC 125, SC 128, SC 162, SC 166 and SC 168) during 2011 and 2012 seasons. Results revealed that increasing N rates from 0 to 214 kg ha -1 was associated with a significant decrease in number of days to 50% tasseling and silking but increased plant height, ear height and grain yield. Further increase in N rate from 214 to 321 kg ha -1 did not significantly affect these traits. Hybrids SC 10 and SC 128 gave the highest yield. On the other hand, the interaction effect between hybrids and nitrogen was significant for plant height, ear height and grain yield in the second season. Nitrogen use efficiency for yield was higher at N application of 214 compared with 321 kg N ha -1 . At 214 kg N ha -1 , SC 10 and SC 128 had the highest N use efficiency in 2011, while SC 125 had the lowest N use efficiency. At the highest N rate (321 kg N ha -1 ) SC 10 had the highest N use efficiency while SC 125 had the lowest N use efficiency in the second season. The increase in nitrogen rates was associated with a gradual decrease in nitrogen recovery (NRc) percent in both seasons. Increase in nitrogen rates was associated with a gradual decrease in partial factor productivity in both seasons.
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Claims 12
Claim · model-written summary
Increasing nitrogen from 0 to 214 kg ha -1 significantly decreased days to tasseling and silking.
- Treatment
- N rates from 0 to 214 kg ha -1e0
- Outcome
- number of days to 50% tasseling and silkinge0
- Direction
- decreasee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N rates from 0 to 214 kg ha -1 was associated with a significant decrease in number of days to 50% tasseling and silking”
t0“maize hybrids”
Claim · model-written summary
Increasing nitrogen from 0 to 214 kg ha -1 increased plant and ear height.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N rates from 0 to 214 kg ha -1 was associated with a significant decrease in number of days to 50% tasseling and silking but increased plant height, ear height and grain yield”
t0“maize hybrids”
Claim · model-written summary
Increasing nitrogen from 0 to 214 kg ha -1 increased grain yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N rates from 0 to 214 kg ha -1 was associated with a significant decrease in number of days to 50% tasseling and silking but increased plant height, ear height and grain yield”
t0“maize hybrids”
Claim · model-written summary
Further nitrogen increase to 321 kg ha -1 did not significantly affect tasseling, silking, heights or yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further increase in N rate from 214 to 321 kg ha -1 did not significantly affect these traits”
t0“maize hybrids”
Claim · model-written summary
SC 10 and SC 128 produced the highest yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrids SC 10 and SC 128 gave the highest yield”
t0“maize hybrids”
Claim · model-written summary
Hybrid-by-nitrogen interactions significantly affected plant height, ear height and grain yield in season two.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction effect between hybrids and nitrogen was significant for plant height, ear height and grain yield in the second season”
t0“maize hybrids”
Claim · model-written summary
Yield nitrogen-use efficiency was higher at 214 than 321 kg N ha -1.
- Treatment
- N application of 214e0
- Outcome
- Nitrogen use efficiency for yielde0
- Direction
- highere0
- Comparator
- 321 kg N ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen use efficiency for yield was higher at N application of 214 compared with 321 kg N ha -1”
t0“maize hybrids”
Claim · model-written summary
At 214 kg N ha -1, SC 10 and SC 128 had highest nitrogen-use efficiency in 2011.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 214 kg N ha -1 , SC 10 and SC 128 had the highest N use efficiency in 2011”
t0“maize hybrids”
Claim · model-written summary
At 321 kg N ha -1, SC 10 had highest nitrogen-use efficiency in season two.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the highest N rate (321 kg N ha -1 ) SC 10 had the highest N use efficiency”
t0“maize hybrids”
Claim · model-written summary
At 321 kg N ha -1, SC 125 had lowest nitrogen-use efficiency in season two.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SC 125 had the lowest N use efficiency in the second season”
t0“maize hybrids”
Claim · model-written summary
Nitrogen recovery percentage declined gradually as nitrogen rates increased in both seasons.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in nitrogen rates was associated with a gradual decrease in nitrogen recovery (NRc) percent in both seasons”
t0“maize hybrids”
Claim · model-written summary
Partial factor productivity declined gradually as nitrogen rates increased in both seasons.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in nitrogen rates was associated with a gradual decrease in partial factor productivity in both seasons”
t0“maize hybrids”