Abstract
The optimum planting dates for maize under dry land agriculture are within the first rains. Late planting of maize results in low yields. However, a lot of communal area farmers plant well after the first rains because of shortages of draught power. In some cases the first planting rains delay resulting in delayed planting. Information on the effect of late planting and its interactions with inorganic fertilizers on crop yields in the semi-arid areas is scarce. The CERES-maize model (v3.1) was validated using data collected from Chivi Communal Area and Chiredzi Research Station and the model was used to evaluate the effect of planting dates on the yield of maize. The model over predicted grain yield by 1.5% and had a slope coefficient of 0.89 of the estimated equation and an r2 value of 0.81. Both the 1995/6 and 1996/7 simulated yields from the planting dates scenarios show that planting can be extended to early December, late December, early January and late January without a significant decrease in yield by adding no nitrogen, 15, 30 and 60 kg ha-1, respectively. UNISWA Jnl Agric Vol.10 2001: 5-11
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Claims 7
Claim · model-written summary
CERES-maize overpredicted maize grain yield by 1.5%.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model over predicted grain yield by 1.5% and had a slope coefficient of 0.89 of the estimated equation and an r2 value of 0.81”
t0“maize”
Claim · model-written summary
CERES-maize yield estimates had a slope coefficient of 0.89.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model over predicted grain yield by 1.5% and had a slope coefficient of 0.89 of the estimated equation and an r2 value of 0.81”
t0“maize”
Claim · model-written summary
CERES-maize yield estimates had an r2 of 0.81.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model over predicted grain yield by 1.5% and had a slope coefficient of 0.89 of the estimated equation and an r2 value of 0.81”
t0“maize”
Claim · model-written summary
Simulated maize planting could extend to early December with no nitrogen without significant yield decrease.
- Treatment
- early Decembere0
- Outcome
- yielde0
- Direction
- without a significant decreasee0
- Qualifier
- no nitrogene0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“planting can be extended to early December, late December, early January and late January without a significant decrease in yield by adding no nitrogen, 15, 30 and 60 kg ha-1, respectively”
t0“maize”
Claim · model-written summary
Simulated maize planting could extend to late December with 15 kg ha-1 nitrogen without significant yield decrease.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“planting can be extended to early December, late December, early January and late January without a significant decrease in yield by adding no nitrogen, 15, 30 and 60 kg ha-1, respectively”
t0“maize”
Claim · model-written summary
Simulated maize planting could extend to early January with 30 kg ha-1 nitrogen without significant yield decrease.
- Treatment
- early Januarye0
- Outcome
- yielde0
- Direction
- without a significant decreasee0
- Qualifier
- 30 and 60 kg ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“planting can be extended to early December, late December, early January and late January without a significant decrease in yield by adding no nitrogen, 15, 30 and 60 kg ha-1, respectively”
t0“maize”
Claim · model-written summary
Simulated maize planting could extend to late January with 60 kg ha-1 nitrogen without significant yield decrease.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“planting can be extended to early December, late December, early January and late January without a significant decrease in yield by adding no nitrogen, 15, 30 and 60 kg ha-1, respectively”
t0“maize”