Abstract
Nickel (Ni) is one of the essential micronutrients for higher plants and its known function is being the metal component of urease. The effects of various Ni levels on urease activity in maize (Zea maize L.) plants grown in two nutrient media containing urea or ammonium nitrate as two separate nitrogen sources were investigated. The experiments were performed as completely randomized blocks with three replications. Treatments included two growth media, the nitrogen of which was either urea or ammonium nitrate added at the rate of 84 mg L -1 and four Ni levels (0, 0.01, 0.05 and 0.1 mg L -1 ) supplied as NiSO4. Plants were grown in the nutrient solutions for six weeks. On the second, fourth and sixth week of the growth period, both the leaves and root samples were taken to determine their urease activities. At the end of the sixth week, the dry weights of both the shoots and roots were also measured. Urease activity in leaves of corn supplied with urea increased significantly with the increase in Ni supply till the end of the 6 th week sampling date, however in those supplied with ammonium nitrate, urease activity increased up to the 3 rd Ni level and 4 th week of sampling date, but was reduced at the 4 th Ni level in the 6 th week. Urease activity in the roots of corn plants supplied with urea was the highest at the 2 nd Ni level at the end of the 2 nd week. Increase in Ni levels and date of sampling resulted in a decrease in urease activity. However, in ammonium nitrate-fed plants urease activity in the 2 nd week of the sampling date increased up to the 4 th Ni level and for other sampling dates the activity increased up to 2 nd Ni level. Further increase in Ni supply and date of sampling resulted in a decrease in urease activity. Enzyme activity was higher in the roots than in the shoots and was also higher in plants supplied with urea, compared to those fed on ammonium nitrate. In maize plants supplied with urea, the dry weights of the shoots and those of the roots were also higher.
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Claims 8
Claim · model-written summary
In maize leaves supplied with urea, urease activity increased significantly with increasing Ni supply up to the end of the 6th week of sampling.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Ni supplye0
- Outcome
- Urease activity in leavese0
- Direction
- increasede0
- Qualifier
- supplied with ureae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urease activity in leaves of corn supplied with urea increased significantly with the increase in Ni supply till the end of the 6 th week sampling date”
Claim · model-written summary
In maize leaves supplied with ammonium nitrate, urease activity increased up to the third Ni level and 4th week of sampling but was reduced at the fourth Ni level in the 6th week.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“however in those supplied with ammonium nitrate, urease activity increased up to the 3 rd Ni level and 4 th week of sampling date, but was reduced at the 4 th Ni level in the 6 th week”
t0“UREASE ACTIVITY IN MAIZE”
Claim · model-written summary
In the roots of maize plants supplied with urea, urease activity was highest at the second Ni level at the end of the second week.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Urease activity in the rootse0
- Qualifier
- highest at the 2 nd Ni levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urease activity in the roots of corn plants supplied with urea was the highest at the 2 nd Ni level at the end of the 2 nd week”
Claim · model-written summary
In roots of urea-supplied maize, increasing Ni levels and later sampling dates decreased urease activity.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Increase in Ni levels and date of samplinge1
- Outcome
- urease activitye1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urease activity in the roots of corn plants supplied with urea was the highest at the 2 nd Ni level at the end of the 2 nd week”
e1“Increase in Ni levels and date of sampling resulted in a decrease in urease activity”
Claim · model-written summary
In ammonium nitrate-fed maize, urease activity increased with Ni up to the 4th Ni level in week 2 and up to the 2nd Ni level at other sampling dates, then decreased with further Ni supply and later sampling.
- Treatment
- Ni levele0
- Outcome
- urease activitye0
- Direction
- increasede0
- Qualifier
- ammonium nitrate-fed plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in ammonium nitrate-fed plants urease activity in the 2 nd week of the sampling date increased up to the 4 th Ni level and for other sampling dates the activity increased up to 2 nd Ni level”
e1“Further increase in Ni supply and date of sampling resulted in a decrease in urease activity”
t0“UREASE ACTIVITY IN MAIZE”
Claim · model-written summary
Urease activity was higher in maize roots than in shoots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enzyme activity was higher in the roots than in the shoots and was also higher in plants supplied with urea, compared to those fed on ammonium nitrate”
t0“UREASE ACTIVITY IN MAIZE”
Claim · model-written summary
Urease activity was higher in maize plants supplied with urea than in those fed ammonium nitrate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enzyme activity was higher in the roots than in the shoots and was also higher in plants supplied with urea, compared to those fed on ammonium nitrate”
t0“UREASE ACTIVITY IN MAIZE”
Claim · model-written summary
In maize supplied with urea, shoot and root dry weights were higher.
- Treatment
- supplied with ureae0
- Outcome
- dry weights of the shoots and those of the rootse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In maize plants supplied with urea, the dry weights of the shoots and those of the roots were also higher”
The same questions in other papers
nitrogen · growth · Zea mays (maize)Positive and negative results
618 papers in the same direction as this paper · 115 in the opposite direction · 14 reporting no difference from an alternative
- negative
- no effect
- negative
744 papers more in this group
See all 748 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.