Abstract
To study the influence of nitrogen sources and potassium levels on growth, yield and chemical constituents of lettuce plants, cv. Balady, two experiments were conducted at Experimental Farm of Barramoon, Dakahlia Governorate during the winter seasons of 1999/2000 and 2000/2001. twelve treatments representing all possible combinations of three N sources (Urea, ammonium nitrate and ammonium sulphate) and four K doses (0, 20, 40 and 60 kg K2O / fed.) were used in split plots design with four replicates. The obtained results can be summarized as follows:- Vegetative growth and yield: 1. Effect of N-sources: Urea followed by ammonium nitrate were significantly increased growth and yield parameters (plant height, No. of outer and inner leaves, fresh and dry weight of outer and inner leaves, fresh weight / plant and total yield, ton/fed.) with no considerable differences among them in most cases. Ammonium sulphate was of the significant least effect. 2. Effect of K levels: Increasing K-levels from 0 up to 60 kg K2O/fed. considerably increased all the studied growth and yield parameters, 60 kg K2O level was the most superior one. 3. Effect of interaction: Interaction significantly affected growth and yield of lettuce plant, NH4NO3 x 60 kg K2O/fed followed by urea x 60 kg K2O/fed were the most superior treatments in their effect with no significant differences among them in most cases. K level (0 K2O/fed) x all N-sources used were the treatments of the significant least effect. Chemical constituents 1. Effect of N-sources: Both urea and ammonium nitrate were significantly improved N, P and K content of lettuce plant relative to ammonium sulphate with no considerable differences among them in most cases in the two seasons of study. On the other hand, urea was of the least NO3 content in their plant leaves. Ammonium nitrate was of the significant highest NO3 content in both seasons. 2. Effect of K-levels: N, P and K content considerably increased along with increasing the supplied K from 0 up to 60 Kg K2O/fed. NO3 accumulation was increased with increasing K from 0 to 40 kg K2O/fed, then decreased at 60 kg level. 3. Effect of interaction: K 0 level with all N-sources were the treatments of the lowest N, P, K and NO3 content relative to other treatments. NO3NH4 and urea x 60 kg K2O/fed were the treatment of the highest N, P and K, meanwhile, urea x 60 Kg K2O was of low NO3 content. Finally, it could be concluded that ammonium nitrate and/or urea each with 60 kg K2O/fed were the best treatments for maximizing the growth and yield of lettuce plant. Urea with 60 kg K2O/fed was the treatment of best yield and low NO3 content of leaves. So, it concluded as best treatment on basis of yield and NO3 safety level for human nutrition.
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Claims 15
Claim · model-written summary
Urea and ammonium nitrate increased lettuce growth and yield measures, with little difference between them.
- Taxon
- LETTUCE
Lactuca sativat0 - Treatment
- Urea followed by ammonium nitratee0
- Outcome
- growth and yield parameterse0
- Direction
- increasede0
- Qualifier
- no considerable differences among them in most casese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea followed by ammonium nitrate were significantly increased growth and yield parameters (plant height, No. of outer and inner leaves, fresh and dry weight of outer and inner leaves, fresh weight / plant and total yield, ton/fed.) with no considerable differences among them in most cases”
t0“LETTUCE LEAVES”
Claim · model-written summary
Ammonium sulphate had the least effect on lettuce growth and yield.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- Ammonium sulphatee0
- Outcome
- least effecte0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium sulphate was of the significant least effect.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Increasing potassium from zero to 60 kg K2O/fed. increased lettuce growth and yield, with 60 kg K2O most effective.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- K-levels from 0 up to 60 kg K2O/fed.e0
- Outcome
- growth and yield parameterse0
- Direction
- increasede0
- Qualifier
- 60 kg K2O level was the most superior onee0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing K-levels from 0 up to 60 kg K2O/fed. considerably increased all the studied growth and yield parameters, 60 kg K2O level was the most superior one.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Ammonium nitrate with 60 kg K2O/fed. and urea with 60 kg K2O/fed. were the strongest combinations for lettuce growth and yield.
- Taxon
- lettuceLactuca sativae0
- Treatment
- NH4NO3 x 60 kg K2O/fed followed by urea x 60 kg K2O/fede0
- Outcome
- growth and yielde0
- Direction
- most superiore0
- Qualifier
- no significant differences among them in most casese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interaction significantly affected growth and yield of lettuce plant, NH4NO3 x 60 kg K2O/fed followed by urea x 60 kg K2O/fed were the most superior treatments in their effect with no significant differences among them in most cases.”
Claim · model-written summary
Zero potassium combined with any nitrogen source had the least effect on lettuce growth and yield.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- K level (0 K2O/fed) x all N-sourcese0
- Outcome
- least effecte0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K level (0 K2O/fed) x all N-sources used were the treatments of the significant least effect.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Urea and ammonium nitrate improved lettuce N, P, and K content relative to ammonium sulphate.
- Taxon
- lettuceLactuca sativae0
- Treatment
- urea and ammonium nitratee0
- Outcome
- N, P and K contente0
- Direction
- improvede0
- Qualifier
- no considerable differences among them in most casese0
- Comparator
- ammonium sulphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both urea and ammonium nitrate were significantly improved N, P and K content of lettuce plant relative to ammonium sulphate with no considerable differences among them in most cases in the two seasons of study.”
Claim · model-written summary
Urea produced the lowest lettuce leaf nitrate content.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- ureae0
- Outcome
- NO3 contente0
- Direction
- leaste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea was of the least NO3 content in their plant leaves”
t0“LETTUCE LEAVES”
Claim · model-written summary
Ammonium nitrate produced the highest lettuce nitrate content in both seasons.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- Ammonium nitratee0
- Outcome
- NO3 contente0
- Direction
- higheste0
- Qualifier
- both seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium nitrate was of the significant highest NO3 content in both seasons.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Lettuce N, P, and K content increased as potassium supply rose from zero to 60 Kg K2O/fed.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- supplied K from 0 up to 60 Kg K2O/fed.e0
- Outcome
- N, P and K contente0
- Direction
- increasede0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N, P and K content considerably increased along with increasing the supplied K from 0 up to 60 Kg K2O/fed.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Lettuce nitrate accumulation rose as potassium increased from zero to 40 kg K2O/fed.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- increasing K from 0 to 40 kg K2O/fede0
- Outcome
- NO3 accumulatione0
- Direction
- increasede0
- Comparator
- 0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3 accumulation was increased with increasing K from 0 to 40 kg K2O/fed”
t0“LETTUCE LEAVES”
Claim · model-written summary
Lettuce nitrate accumulation decreased at the 60 kg potassium level.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- 60 kg levele0
- Outcome
- NO3 accumulatione0
- Direction
- decreasede0
- Comparator
- 40 kg K2O/fede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3 accumulation was increased with increasing K from 0 to 40 kg K2O/fed, then decreased at 60 kg level.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Zero potassium with all nitrogen sources gave the lowest lettuce N, P, K, and nitrate contents.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- K 0 level with all N-sourcese0
- Outcome
- N, P, K and NO3 contente0
- Direction
- loweste0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K 0 level with all N-sources were the treatments of the lowest N, P, K and NO3 content relative to other treatments.”
t0“LETTUCE LEAVES”
Claim · model-written summary
Ammonium nitrate or urea with 60 kg K2O/fed. yielded the highest lettuce N, P, and K content.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- NO3NH4 and urea x 60 kg K2O/fede0
- Outcome
- N, P and Ke0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3NH4 and urea x 60 kg K2O/fed were the treatment of the highest N, P and K”
t0“LETTUCE LEAVES”
Claim · model-written summary
Urea with 60 Kg K2O produced low lettuce nitrate content.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- urea x 60 Kg K2Oe0
- Outcome
- NO3 contente0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea x 60 Kg K2O was of low NO3 content”
t0“LETTUCE LEAVES”
Claim · model-written summary
The authors recommend urea with 60 kg K2O/fed. for lettuce yield and low leaf nitrate.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- Urea with 60 kg K2O/fede0
- Outcome
- best treatment on basis of yield and NO3 safety levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea with 60 kg K2O/fed was the treatment of best yield and low NO3 content of leaves. So, it concluded as best treatment on basis of yield and NO3 safety level for human nutrition.”
t0“LETTUCE LEAVES”
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