Abstract
In this study, the effects of zinc (Zn) and humic acid (HA) applications on soils (12 Aridisol soil samples) formed on limestone and marl parent materials, which are very common in Türkiye, were tested by incubation, adsorption, and greenhouse experiments. Adsorption experiments were carried out using the batch sorption technique, and the Langmuir and Freundlich isotherm parameters were calculated. In the incubation, soils were incubated with control, HA, Zn, and HA+Zn, and the DTPA-Zn was tested in five different periods (1, 7, 15, 30, and 90th days). Maize was grown for eight weeks in pots in the greenhouse. The maximum Zn adsorption for all soils ranged between 3333 and 6250 mg kg-1 in marl soils and 1042 and 5263 mg kg-1 in limestone soils, which decreased to ranges between 2631 and 5555 mg kg-1 in marl soils and 1052 and 5000 mg kg-1 in limestone soils with HA appli-cation, respectively. The desorption rate (%) of adsorbed Zn increased as the initial Zn concentration increased in all soil series formed on marl (smectite clay mineral) and lime-stone (kaolinite clay mineral) parent materials. The effects of humic acid and Zn applica-tion on the fresh and dry weights of maize were found to be statistically significant at the 5% level for marl and limestone parent material. Humic acid application increased the fresh weight of maize compared with that of the control. The highest available Zn was determined in Başkuyu series (0.79 mg kg-1) formed on marl parent material, while the lowest available Zn was obtained in Saraççeşme series (0.60 mg kg-1) formed on limestone parent material. In the greenhouse, HA increased the fresh weight of maize in soils formed on both parent materials by 0.4 and 19.6%, respectively, compared to the control. Zn fertili-zation with HA further increased the fresh and dry yields, with 12 mg kg-1 performing bet-ter. Smax (maximum Zn adsorption of the soil) parameters of soils were negatively corre-lated with EC, Pav, Kav, organic matter, silt, clay, total N, and cation exchange capacity (CEC) of the samples. Although HA alone increases the availability of Zn in plants, HA + Zn appli-cations should be applied together to obtain higher yields.
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Claims 7
Claim · model-written summary
Humic acid significantly affected maize fresh and dry weights.
- Treatment
- humic acide0
- Outcome
- fresh and dry weights of maizee0
- Setting
- marl and limestone parent materiale0
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of humic acid and Zn applica-tion on the fresh and dry weights of maize were found to be statistically significant at the 5% level for marl and limestone parent material”
Claim · model-written summary
Humic acid increased maize fresh weight relative to control.
- Treatment
- Humic acid applicatione0
- Outcome
- fresh weight of maizee0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Humic acid application increased the fresh weight of maize compared with that of the control”
Claim · model-written summary
HA raised maize fresh weight by 0.4% on one parent material.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA increased the fresh weight of maize in soils formed on both parent materials by 0.4 and 19.6%, respectively, compared to the control”
Claim · model-written summary
HA raised maize fresh weight by 19.6% on the other parent material.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA increased the fresh weight of maize in soils formed on both parent materials by 0.4 and 19.6%, respectively, compared to the control”
Claim · model-written summary
Zn fertilization with HA further increased fresh yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn fertili-zation with HA further increased the fresh and dry yields, with 12 mg kg-1 performing bet-ter”
t0“maize”
Claim · model-written summary
Zn fertilization with HA further increased dry yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn fertili-zation with HA further increased the fresh and dry yields, with 12 mg kg-1 performing bet-ter”
t0“maize”
Claim · model-written summary
The authors recommend applying HA and Zn together for higher yields.
- Outcome
- HA + Zn appli-cations should be applied together to obtain higher yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HA + Zn appli-cations should be applied together to obtain higher yields”
t0“maize”
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See all 253 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.