Abstract
A study was carried out as field experiments at Demo experimental station, Fayoum district in summer seasons 2015 and 2016 to investigate the effects of plant density and humic acid soil application on oil content, nutrient uptakes, vegetative growth and yield of sunflower (Helianthus annuus L.) plants. A split plot layout within a randomized completely blocks design with 3 replications were used. Three treatments of plant density i.e., D1=47,619 plant/ha-1 (0.7x0.3 m), D2=71,428 plant/ha-1 (0.7x0.2 m) and D3= 95,238 plant/ha-1 (0.7x0.15 m) were placed in the main plots. The subplot treatments were 5 levels (0.0, 1.25, 2.5, 3.75 and 5 kg ha-1) of humic acid. The results indicated that the plant density D1 gave the highest values of plant height, number of leaves plant-1, leaf, stem and head dry weights plant-1 and seed yield plant-1. However, the plant density D2 recorded the highest seed yield ha-1. Both plant densities (D1) and (D2) surpassed D3 concerning on values of leaf and seed (N, P, K, Mg, Mn, Zn and Fe) uptakes. Soil addition of humic acid at rate of 5 kg ha-1 significantly produced the highest values of growth parameters, yield, its components as well as oil content and nutrient uptakes in both seasons. The highest sunflower seed yield was obtained when plant density was 71.428 plant ha-1 (D2) and treated with 5 kg ha-1 of humic acid as a soil application.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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 10
Claim · model-written summary
Low plant density D1 had the highest plant height and leaf number.
- Taxon
- sunflower (Helianthus annuus L.)
Helianthus annuust0 - Treatment
- plant density D1e0
- Outcome
- plant height, number of leaves plant-1e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant density D1 gave the highest values of plant height, number of leaves plant-1, leaf, stem and head dry weights plant-1 and seed yield plant-1.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D1 had the highest leaf, stem and head dry weights.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- plant density D1e0
- Outcome
- leaf, stem and head dry weights plant-1e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant density D1 gave the highest values of plant height, number of leaves plant-1, leaf, stem and head dry weights plant-1 and seed yield plant-1.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D1 had the highest seed yield per plant.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- plant density D1e0
- Outcome
- seed yield plant-1e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant density D1 gave the highest values of plant height, number of leaves plant-1, leaf, stem and head dry weights plant-1 and seed yield plant-1.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D2 gave the highest seed yield per hectare.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- plant density D2e0
- Outcome
- seed yield ha-1e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant density D2 recorded the highest seed yield ha-1.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D1 and D2 exceeded D3 in leaf N, P and K uptake.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- (D1) and (D2)e0
- Outcome
- leaf and seed (N, P, Ke0
- Direction
- surpassede0
- Comparator
- D3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both plant densities (D1) and (D2) surpassed D3 concerning on values of leaf and seed (N, P, K, Mg, Mn, Zn and Fe) uptakes.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D1 and D2 exceeded D3 in Mg, Mn and Zn uptake.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- (D1) and (D2)e0
- Outcome
- Mg, Mn, Zne0
- Direction
- surpassede0
- Comparator
- D3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both plant densities (D1) and (D2) surpassed D3 concerning on values of leaf and seed (N, P, K, Mg, Mn, Zn and Fe) uptakes.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D1 and D2 exceeded D3 in Fe uptake.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- (D1) and (D2)e0
- Outcome
- Fe) uptakese0
- Direction
- surpassede0
- Comparator
- D3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both plant densities (D1) and (D2) surpassed D3 concerning on values of leaf and seed (N, P, K, Mg, Mn, Zn and Fe) uptakes.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
Humic acid at 5 kg ha-1 gave the highest growth and yield components.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- humic acid at rate of 5 kg ha-1e0
- Outcome
- growth parameters, yield, its componentse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil addition of humic acid at rate of 5 kg ha-1 significantly produced the highest values of growth parameters, yield, its components as well as oil content and nutrient uptakes in both seasons.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
Humic acid at 5 kg ha-1 gave the highest oil content and nutrient uptake.
- Taxon
- sunflower (Helianthus annuus L.)Helianthus annuust0
- Treatment
- humic acid at rate of 5 kg ha-1e0
- Outcome
- oil content and nutrient uptakese0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil addition of humic acid at rate of 5 kg ha-1 significantly produced the highest values of growth parameters, yield, its components as well as oil content and nutrient uptakes in both seasons.”
t0“Sunflower (Helianthus annuus L.)”
Claim · model-written summary
D2 plus 5 kg ha-1 humic acid gave the highest seed yield.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- plant density was 71.428 plant ha-1 (D2) and treated with 5 kg ha-1 of humic acide0
- Outcome
- seed yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest sunflower seed yield was obtained when plant density was 71.428 plant ha-1 (D2) and treated with 5 kg ha-1 of humic acid as a soil application.”
The same questions in other papers
other · quality: oil · Helianthus annuus (common sunflower)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
6 papers more in this group
See all 10 papers →density · growth · Helianthus annuus (common sunflower)Positive and negative results
16 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- negative
18 papers more in this group
See all 22 papers →other · yield · Helianthus annuus (common sunflower)Positive and negative results
21 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- negative
20 papers more in this group
See all 24 papers →density · yield · Helianthus annuus (common sunflower)Positive and negative results
69 papers in the same direction as this paper · 15 in the opposite direction
- negative
- negative
- positive
81 papers more in this group
See all 85 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.