Abstract
Increasing costs of chemical fertilizers, environmental concerns of their application and demand for protein foods, placed an extensive interest in growing of legume crops for human nutrition, and soil fertility replenishment. This study was conducted to investigate the effects of nitrogen (N) and phosphorus (P) fertilizers on parameters of phenology, growth performance, grain yield, yield components, grain protein content of groundnut, and residual soil nitrogen content in the northern Ethiopia during the growing season of 2017. Three levels of N (0, 15 and 30 kg ha −1 ) and four levels of P 2 O 5 (0, 23, 46 and 69 kg ha −1 ) were set in factorial combinations of randomized complete block design with three replications. Results showed that an average total biomass yield increased by 22.5% for separate individual application of 15 kg N ha −1 and by 16.6% for 46 kg P 2 O 5 ha −1 compared to control plots. Haulm yield increased by 29.17% for plots treated with N fertilization compared to control plots. Average pod yield increased by 85.4% for a combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 fertilizers compared to the control plots. Plots fertilized with the highest combined rates of N and P have attained lower grain yield compared to the combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 . The highest grain protein contents were obtained for a combined application of 30 kg N ha −1 and zero P, and 15 kg N ha −1 plus 46 kg P 2 O 5 ha −1 . The highest N harvest index was obtained for control treatments and for plots treated with combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 . Residual soil N content increased by 119% on plots with combined application of 15 kg N ha −1 and 46 P 2 O 5 ha −1 compared to control plots. Based on our results, combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 was recommended for increasing grain yield, grain protein content and residual soil nitrogen. The results of this study are crucial to improve groundnut productivity, grain protein content and also to provide implication on soil fertility management in a crop rotation system.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Separate application of 15 kg N increased total biomass yield of groundnut by 22.5% relative to control plots.
- Taxon
- groundnut
Arachis hypogaeat0 - Treatment
- separate individual application of 15 kg Ne1
- Outcome
- total biomass yielde1
- Direction
- increasede1
- Value
- 22.5%e1
- Comparator
- control plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e1“Results showed that an average total biomass yield increased by 22.5% for separate individual application of 15 kg N ha −1 and by 16.6% for 46 kg P 2 O 5 ha −1 compared to control plots”
Claim · model-written summary
Separate application of 46 kg P2O5 increased total biomass yield of groundnut by 16.6% relative to control plots.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- 46 kg P 2 O 5e1
- Outcome
- total biomass yielde1
- Direction
- increasede1
- Value
- 16.6%e1
- Comparator
- control plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e1“Results showed that an average total biomass yield increased by 22.5% for separate individual application of 15 kg N ha −1 and by 16.6% for 46 kg P 2 O 5 ha −1 compared to control plots”
Claim · model-written summary
N fertilization increased haulm yield of groundnut by 29.17% relative to control plots.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- N fertilizatione2
- Outcome
- Haulm yielde2
- Direction
- increasede2
- Value
- 29.17%e2
- Comparator
- control plotse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e2“Haulm yield increased by 29.17% for plots treated with N fertilization compared to control plots”
Claim · model-written summary
Combined application of 15 kg N and 46 kg P2O5 increased average pod yield of groundnut by 85.4% relative to control plots.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- combined application of 15 kg Ne3
- Outcome
- Average pod yielde3
- Direction
- increasede3
- Value
- 85.4%e3
- Comparator
- control plotse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e3“Average pod yield increased by 85.4% for a combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 fertilizers compared to the control plots”
Claim · model-written summary
The highest combined N and P rates gave lower grain yield of groundnut than the combined application of 15 kg N and 46 kg P2O5.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- highest combined rates of N and Pe4
- Outcome
- grain yielde4
- Direction
- lowere4
- Comparator
- combined application of 15 kg Ne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e4“Plots fertilized with the highest combined rates of N and P have attained lower grain yield compared to the combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1”
Claim · model-written summary
Combined application of 30 kg N and zero P gave the highest grain protein content of groundnut.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- combined application of 30 kg Ne5
- Outcome
- grain protein contentse5
- Direction
- higheste5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e5“The highest grain protein contents were obtained for a combined application of 30 kg N ha −1 and zero P, and 15 kg N ha −1 plus 46 kg P 2 O 5 ha −1”
Claim · model-written summary
Combined application of 15 kg N and 46 kg P2O5 gave the highest grain protein content of groundnut.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- 15 kg N ha −1 plus 46 kg P 2 O 5 ha −1e5
- Outcome
- grain protein contentse5
- Direction
- higheste5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e5“The highest grain protein contents were obtained for a combined application of 30 kg N ha −1 and zero P, and 15 kg N ha −1 plus 46 kg P 2 O 5 ha −1”
Claim · model-written summary
Control treatments gave the highest N harvest index in groundnut.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- control treatmentse6
- Outcome
- N harvest indexe6
- Direction
- higheste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e6“The highest N harvest index was obtained for control treatments and for plots treated with combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1”
Claim · model-written summary
Combined application of 15 kg N and 46 kg P2O5 gave the highest N harvest index in groundnut.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- combined application of 15 kg Ne6
- Outcome
- N harvest indexe6
- Direction
- higheste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e6“The highest N harvest index was obtained for control treatments and for plots treated with combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1”
Claim · model-written summary
Combined application of 15 kg N and 46 kg P2O5 increased residual soil N content by 119% relative to control plots.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- combined application of 15 kg Ne7
- Outcome
- Residual soil N contente7
- Direction
- increasede7
- Value
- 119%e7
- Comparator
- control plotse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e7“Residual soil N content increased by 119% on plots with combined application of 15 kg N ha −1 and 46 P 2 O 5 ha −1 compared to control plots”
Claim · model-written summary
Combined application of 15 kg N and 46 kg P2O5 is recommended for increasing groundnut grain yield, grain protein content and residual soil nitrogen.
- Taxon
- groundnutArachis hypogaeat0
- Treatment
- combined application of 15 kg Ne1
- Outcome
- grain yield, grain protein content and residual soil nitrogene1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“groundnut”
e1“Based on our results, combined application of 15 kg N ha −1 and 46 kg P 2 O 5 ha −1 was recommended for increasing grain yield, grain protein content and residual soil nitrogen”
The same questions in other papers
nitrogen · yield · Arachis hypogaea (peanut)Results differ
124 papers in the same direction as this paper · 20 in the opposite direction
- no effect
- negative
- negative
141 papers more in this group
See all 145 papers →phosphorus · yield · Arachis hypogaea (peanut)Results differ
17 papers in the same direction as this paper · 160 in the opposite direction
- positive
- positive
- positive
174 papers more in this group
See all 178 papers →nitrogen · nutrient: content · Arachis hypogaea (peanut)Positive and negative results
21 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
20 papers more in this group
See all 24 papers →fertilization · yield · Arachis hypogaea (peanut)Positive and negative results
634 papers in the same direction as this paper · 44 in the opposite direction · 4 reporting no difference from an alternative
- positive
- positive
- positive
679 papers more in this group
See all 683 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.