Abstract
The study was conducted to determine available Zn in the soils, evaluate the critical limits of Zn for maize and then establish optimum rate of Zn fertilizer required to achieve maximum Zn uptake and grain yield in maize producing area of southeastern Nigeria. Results of the 20 surface (0-20 cm) soil samples analyzed were sandy loam (SL), very strongly acidic (4.62) in reaction, low in organic carbon (0.98 gkg-1) and in ECEC (8.15 cmol kg-1). The status of available Zn in the soils by different extractants were found to be very low and ranged from 0.38 mgkg-1 to 2.24 mgkg-1 extracted by NH4OAc, and Coca-Cola methods, respectively. The critical limits of Zn in the soils and maize plant, below which high response of applied ZnSO4 to maize could be expected were determined by Cate-Nelson according to the extraction methods as: 0.90-1.52, 1.10-1.65, and 0.70- 1.13, 2.40-3.92 and 2.50-4.24 mgkg-1 for Coca-Cola, EDTA, HCl, NH4OAc + EDTA and NH4OAc, respectively. The results of the pot and field experiments shows that levels of Zn significantly (P<0.05) increased both DMY and grain yields. Approximately 11 kg Zn ha-1 was estimated to be the optimum level of ZnSO4 required for Zn uptake in maize producing for soils of southeastern Nigeria. Similarly, in the field experiment, Zn fertilizers significantly improved grain yields. The application of ZnSO4 fertilizer yielded maximum grain yield of 7.9 and 5.1 tha-1 at the optimum rates of 9.0 and 9.6 kg ha-1 in the 2009 and 2010 plantings.Keywords: Acid sand, critical limit, extractable Zn, maize grain, optimum yield and ZnSO4 fertilizer
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Claims 8
Claim · model-written summary
Available soil zinc was very low, ranging from 0.38 to 2.24 mgkg-1 across extraction methods.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“The status of available Zn in the soils by different extractants were found to be very low and ranged from 0.38 mgkg-1 to 2.24 mgkg-1”
Claim · model-written summary
Cate-Nelson analysis determined zinc critical limits for soil and maize across extraction methods.
- Outcome
- critical limits of Zn in the soils and maize plante0
- Value
- 0.90-1.52, 1.10-1.65, and 0.70- 1.13, 2.40-3.92 and 2.50-4.24 mgkg-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“The critical limits of Zn in the soils and maize plant, below which high response of applied ZnSO4 to maize could be expected were determined by Cate-Nelson according to the extraction methods as: 0.90-1.52, 1.10-1.65, and 0.70- 1.13, 2.40-3.92 and 2.50-4.24 mgkg-1”
Claim · model-written summary
Zinc levels significantly increased maize dry matter yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“levels of Zn significantly (P<0.05) increased both DMY and grain yields”
Claim · model-written summary
Zinc levels significantly increased maize grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“levels of Zn significantly (P<0.05) increased both DMY and grain yields”
Claim · model-written summary
Approximately 11 kg Zn ha-1 was estimated as the optimum zinc sulfate level for maize zinc uptake.
- Outcome
- optimum level of ZnSO4 required for Zn uptakee0
- Value
- 11 kg Zn ha-1e0
- Setting
- southeastern Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“Approximately 11 kg Zn ha-1 was estimated to be the optimum level of ZnSO4 required for Zn uptake in maize producing for soils of southeastern Nigeria”
Claim · model-written summary
Zinc fertilizers significantly improved grain yield in the field experiment.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“in the field experiment, Zn fertilizers significantly improved grain yields”
Claim · model-written summary
Zinc sulfate at 9.0 kg ha-1 produced maximum maize grain yield of 7.9 tha-1 in 2009.
- Treatment
- ZnSO4 fertilizere0
- Outcome
- grain yielde0
- Direction
- maximume0
- Value
- 7.9e0
- Qualifier
- 9.0 and 9.6 kg ha-1 in the 2009 and 2010 plantingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“The application of ZnSO4 fertilizer yielded maximum grain yield of 7.9 and 5.1 tha-1 at the optimum rates of 9.0 and 9.6 kg ha-1 in the 2009 and 2010 plantings”
Claim · model-written summary
Zinc sulfate at 9.6 kg ha-1 produced maximum maize grain yield of 5.1 tha-1 in 2010.
- Treatment
- ZnSO4 fertilizere0
- Outcome
- grain yielde0
- Direction
- maximume0
- Value
- 5.1 tha-1e0
- Qualifier
- 9.6 kg ha-1 in the 2009 and 2010 plantingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize (Zea mays L.)”
e0“The application of ZnSO4 fertilizer yielded maximum grain yield of 7.9 and 5.1 tha-1 at the optimum rates of 9.0 and 9.6 kg ha-1 in the 2009 and 2010 plantings”
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