Abstract
The aim of this study was to examine the effects of application of humic acid and calcium forms and there interaction on soil (PH, EC), dry weight, nutrients uptake of selected elements in maize (Zea mays L.) grown under salt stress. Four different doses of humic acid (0, 1.0, 2.0 and 3.0g kg -1 ) and calcium forms (calcium sulphate (CaSO4), calcium nitrate (Ca(NO3)2) and calcium chloride (CaCl2)) were applied to the soil. Humic acids are an important soil component that can improve nutrient availability and impact on other important chemical, biological, and physical properties of soils. Application of humic acid and calcium forms significantly affected maize dry weight and nutrients uptake except Mn and Zn uptake. The salts at no humic acid applications caused plant death, but no plant death was obtained in humic application (1.0 and 2.0g kg -1 ) doses in all of the salt type. The effects of salts in nutrient uptake were significant. Application of humic acid (1.0 and 2.0g kg -1 ) doses and calcium sulphate (CaSO4) increased dry weight and the N, P, K, Fe and Zn uptake of the maize plants. The soil pH was significantly decreased with application of humic acid. Also, the soil pH was significantly decreased with application of CaSO4 compared with control. EC decrease significantly with application of humic acid (2.0 and 3.0g kg -1 ) doses. On the other hand, EC value was
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Claims 10
Claim · model-written summary
Salts without humic acid application caused maize plant death.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The salts at no humic acid applications caused plant death”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Humic application at 1.0 and 2.0 g/kg prevented maize plant death under salt stress, unlike no humic acid application.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The salts at no humic acid applications caused plant death”
e2“in maize (Zea mays L.) grown under salt stress”
e3“no plant death was obtained in humic application (1.0 and 2.0g kg -1) doses”
Claim · model-written summary
Humic acid at 1.0 and 2.0 g/kg increased maize dry weight under salt stress.
- Treatment
- humic acid (1.0 and 2.0g kg -1) dosese4
- Outcome
- dry weighte4
- Direction
- increasede4
- Qualifier
- under salt stresse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of humic acid (1.0 and 2.0g kg -1) doses and calcium sulphate (CaSO4) increased dry weight and the N, P, K, Fe and Zn uptake of the maize plants”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Calcium sulphate increased maize dry weight under salt stress.
- Treatment
- calcium sulphate (CaSO4)e4
- Outcome
- dry weighte4
- Direction
- increasede4
- Qualifier
- under salt stresse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of humic acid (1.0 and 2.0g kg -1) doses and calcium sulphate (CaSO4) increased dry weight and the N, P, K, Fe and Zn uptake of the maize plants”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Humic acid at 1.0 and 2.0 g/kg increased maize uptake of N, P, K, Fe and Zn.
- Treatment
- humic acid (1.0 and 2.0g kg -1) dosese4
- Outcome
- N, P, K, Fe and Zn uptakee4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of humic acid (1.0 and 2.0g kg -1) doses and calcium sulphate (CaSO4) increased dry weight and the N, P, K, Fe and Zn uptake of the maize plants”
Claim · model-written summary
Calcium sulphate increased maize uptake of N, P, K, Fe and Zn.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Application of humic acid (1.0 and 2.0g kg -1) doses and calcium sulphate (CaSO4) increased dry weight and the N, P, K, Fe and Zn uptake of the maize plants”
Claim · model-written summary
Humic acid application significantly decreased soil pH.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The soil pH was significantly decreased with application of humic acid”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Calcium sulphate application significantly decreased soil pH compared with control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the soil pH was significantly decreased with application of CaSO4 compared with control”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Humic acid at 2.0 and 3.0 g/kg significantly decreased soil EC.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“EC decrease significantly with application of humic acid (2.0 and 3.0g kg -1) doses”
e2“in maize (Zea mays L.) grown under salt stress”
Claim · model-written summary
Salts significantly affected maize nutrient uptake.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of salts in nutrient uptake were significant”
e2“in maize (Zea mays L.) grown under salt stress”
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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.