Abstract
Nitrogen is one of the most important factors affecting maize yield and profitability of smallholders under semiarid climates. Field experiments were conducted to investigate the impact of different N-fertilizer sources [urea, calcium ammonium nitrate (CAN) and ammonium sulphate (AS)] and rates (50, 100, 150 and 200 kg ha-1) on umber of rows ear-1 (NOR ear-1), number of seeds row-1 (NOS row-1), number of seeds ear-1 (NOS ear-1), number of ears per 100 plants (NOEP 100 plants-1), grain yield plant-1, stover yield (kg ha-1) and shelling percentage (%) of maize genotypes “Local cultivars (Azam and Jalal) vs. hybrid (Pioneer-3025)”. The experiment was conducted at the Agronomy Research Farm of the University of Agriculture Peshawar during summers of 2008 (year one) and 2010 (year two). The results revealed that the N treated (rest) plots (the average of all the experimental plots treated with N) had produced higher yield and yield components, and shelling percentage over N-control plots (plots where N was not applied). Application of nitrogen at the higher rate increased yield and yield components in maize (200 > 150 > 100 > 50 kg N ha-1). Application of AS and CAN had more beneficial impact on yield and yield components of maize as compared to urea (AS > CAN > urea). Hybrid maize (P-3025) produced significantly higher yield and yield components as well as higher shelling percentage than the two local cultivars (P-3025 > Jalal = Azam). We concluded from this study that application of N-fertilizer especially ammonium sulphate at the higher rate of 200 kg N ha-1 to hybrid maize could increase maize productivity and grower’s income in the study area. For the two local cultivars, application of 150 kg N ha-1 was found more beneficial than the recommended rate (120 kg N ha-1) in terms of higher yield, yield components and growers income.
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Claims 7
Claim · model-written summary
Nitrogen treated maize plots had higher yield, yield components and shelling percentage than controls.
- Treatment
- N treated (rest) plotse0
- Outcome
- yield and yield components, and shelling percentagee0
- Direction
- highere0
- Comparator
- N-control plotse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results revealed that the N treated (rest) plots (the average of all the experimental plots treated with N) had produced higher yield and yield components, and shelling percentage over N-control plots (plots where N was not applied)”
t0“Maize”
Claim · model-written summary
Higher nitrogen rates increased maize yield and yield components, ranked 200 above 150 above 100 above 50 kg N ha-1.
- Treatment
- nitrogen at the higher ratee0
- Outcome
- yield and yield componentse0
- Direction
- increasede0
- Value
- 200 > 150 > 100 > 50 kg N ha-1e0
- Comparator
- 50 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of nitrogen at the higher rate increased yield and yield components in maize (200 > 150 > 100 > 50 kg N ha-1)”
Claim · model-written summary
Ammonium sulphate gave greater maize yield and yield components than urea.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of AS and CAN had more beneficial impact on yield and yield components of maize as compared to urea (AS > CAN > urea)”
Claim · model-written summary
Calcium ammonium nitrate gave greater maize yield and yield components than urea.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of AS and CAN had more beneficial impact on yield and yield components of maize as compared to urea (AS > CAN > urea)”
Claim · model-written summary
Hybrid maize P-3025 had significantly higher yield, yield components and shelling percentage than the local cultivars.
- Material
- P-3025e0
- Outcome
- yield and yield components as well as higher shelling percentagee0
- Direction
- highere0
- Comparator
- the two local cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid maize (P-3025) produced significantly higher yield and yield components as well as higher shelling percentage than the two local cultivars (P-3025 > Jalal = Azam)”
Claim · model-written summary
The authors recommend ammonium sulphate at 200 kg N ha-1 for hybrid maize productivity and income.
- Material
- hybrid maizee0
- Treatment
- ammonium sulphate at the higher rate of 200 kg N ha-1e0
- Outcome
- maize productivity and grower’s incomee0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We concluded from this study that application of N-fertilizer especially ammonium sulphate at the higher rate of 200 kg N ha-1 to hybrid maize could increase maize productivity and grower’s income in the study area”
Claim · model-written summary
For the two local maize cultivars, 150 kg N ha-1 was more beneficial than 120 kg N ha-1 for yield, yield components and income.
- Material
- the two local cultivarse0
- Treatment
- 150 kg N ha-1e0
- Outcome
- yield, yield components and growers incomee0
- Direction
- highere0
- Comparator
- 120 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the two local cultivars, application of 150 kg N ha-1 was found more beneficial than the recommended rate (120 kg N ha-1) in terms of higher yield, yield components and growers income”
t0“Maize”
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