Abstract
Grain yield of maize is mostly affected by amount of available water and nitrogen and correlated to yield components. In this 2-years study the influence of different irrigation water amounts (a1=rainfed; a2=60-100% field water capacity (FWC); a3=80-100% FWC), nitrogen fertilizer levels (b1=0 kg*N*ha-1; b2=100 kg*N*ha-1; b3=200 kg*N*ha-1) and hybrids (c1=OSSK515; c2=OS5997; c3=OS5775; c4=OS5885) on grain yield and yield components was tested. Furthermore the correlation analysis as well as direct and indirect path coefficients were used to analyse the connection between yield and yield components (grain number/cob, grain weight, 1000 grain weight, cob length, cob weight) across tested treatments. The influence of all tested factors was significant (P<0.05) in both years of study. Specific study results were obtained in extremely wet year 2010 when irrigation water reduced grain yield and yield components (a1=9.9; a2=8.8; a3=7.8 t*ha-1). Opposite to year 2013 when irrigation water increased grain yield as well as yield components (a1=8.9; a2=9.7; a3=10.3 t*ha-1). Nitrogen fertilizer was significant to all tested variables in both years of the study (b1=5.7; b2=9.2; b3=11.7 t*ha-1 in 2010 and b1=6.3; b2=8.9; b3=10.6 t*ha-1 in 2013). Generally, the greatest amount of nitrogen fertilizer the larger yield or yield components are achieved. The influence of hybrid was significant for all tested variables with exemption to 1000 grain weight and grain weight/cob during growing season 2013. In both years of the study hybrid c2 OS5997 achieved the highest yield as well as yield components. Correlation analysis showed strong positive correlation between yield and cob weight (r=0.77 (2010); r=0.84 (2013)) what is confirmed with direct and indirect path analysis test.
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Claims 10
Claim · model-written summary
In wet 2010, increasing irrigation reduced grain yield from 9.9 to 8.8 to 7.8 t*ha-1.
- Treatment
- irrigation watere0
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- a1=9.9; a2=8.8; a3=7.8 t*ha-1e0
- Comparator
- a1e0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation water reduced grain yield and yield components (a1=9.9; a2=8.8; a3=7.8 t*ha-1)”
e1“maize”
Claim · model-written summary
In wet 2010, irrigation reduced yield components.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation water reduced grain yield and yield components”
e1“maize”
Claim · model-written summary
In 2013, irrigation increased yield from 8.9 to 9.7 to 10.3 t*ha-1.
- Treatment
- irrigation watere0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- a1=8.9; a2=9.7; a3=10.3 t*ha-1e0
- Comparator
- a1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation water increased grain yield as well as yield components (a1=8.9; a2=9.7; a3=10.3 t*ha-1)”
e1“maize”
Claim · model-written summary
In 2013, irrigation increased yield components.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation water increased grain yield as well as yield components”
e1“maize”
Claim · model-written summary
Increasing nitrogen raised 2010 yield from 5.7 to 9.2 to 11.7 t*ha-1.
- Treatment
- Nitrogen fertilizere1
- Outcome
- yielde3
- Direction
- largere3
- Value
- b1=5.7; b2=9.2; b3=11.7 t*ha-1e0
- Comparator
- b1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“b1=5.7; b2=9.2; b3=11.7 t*ha-1 in 2010”
e1“Nitrogen fertilizer was significant to all tested variables”
e2“maize”
e3“the larger yield or yield components are achieved”
Claim · model-written summary
Increasing nitrogen raised 2013 yield from 6.3 to 8.9 to 10.6 t*ha-1.
- Treatment
- Nitrogen fertilizere1
- Outcome
- yielde3
- Direction
- largere3
- Value
- b1=6.3; b2=8.9; b3=10.6 t*ha-1e0
- Comparator
- b1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“b1=6.3; b2=8.9; b3=10.6 t*ha-1 in 2013”
e1“Nitrogen fertilizer was significant to all tested variables”
e2“maize”
e3“the larger yield or yield components are achieved”
Claim · model-written summary
More nitrogen generally produced larger yield components.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greatest amount of nitrogen fertilizer the larger yield or yield components are achieved”
e1“maize”
Claim · model-written summary
Hybrid significantly affected tested variables except thousand grain weight and grain weight per cob in 2013.
- Treatment
- hybride0
- Outcome
- all tested variablese0
- Qualifier
- with exemption to 1000 grain weight and grain weight/cob during growing season 2013e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“influence of hybrid was significant for all tested variables with exemption to 1000 grain weight and grain weight/cob during growing season 2013”
e1“maize”
Claim · model-written summary
OS5997 had the highest yield and yield components in both years.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both years of the study hybrid c2 OS5997 achieved the highest yield as well as yield components”
e1“maize”
Claim · model-written summary
Yield and cob weight had strong positive correlations of 0.77 in 2010 and 0.84 in 2013.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strong positive correlation between yield and cob weight (r=0.77 (2010); r=0.84 (2013))”
e1“maize”
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