Abstract
Abstract There is lack of information available concerning the effect of humic substances (HS) applied via fertigation on plant growth in sandy soils. Therefore, a field experiment was carried out at El‐Saff district (20 km southwest of Cairo), Egypt, to investigate the role of HS fertigation on water retention of a sandy soil, yield and quality of broccoli ( Broccoli oleracea L.) as well as on soil nutrient concentration retained after harvest. The experiment consisted of six fertigation treatments (50%, 75%, and 100% of the recommended NPK‐fertilizer rate for broccoli combined with and without HS application at 120 L ha –1 ) in a complete randomized block design with three replicates. Humic substances affected spatial water distribution and improved water retention in the root zone. Furthermore, application of HS increased total marketable yield and head diameter of broccoli as well as quality parameters ( i.e., total soluble solids, protein, and vitamin C). Higher nutrient concentrations were found in the broccoli heads and concentrations of plant‐available nutrients in soil after harvesting were also higher, indicating an improvement in soil fertility. In conclusion, HS fertigation can be judged as an interesting option to improve soil water and nutrient status leading to better plant growth.
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Claims 7
Claim · model-written summary
Humic substances improved water retention in the root zone.
- Taxon
- broccoli
Brassica oleracea var. italicae1 - Treatment
- Humic substancese0
- Outcome
- water retention in the root zonee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Humic substances affected spatial water distribution and improved water retention in the root zone”
e1“yield and quality of broccoli”
Claim · model-written summary
Humic substances affected spatial soil-water distribution.
- Taxon
- broccoliBrassica oleracea var. italicae1
- Treatment
- Humic substancese0
- Outcome
- spatial water distributione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Humic substances affected spatial water distribution and improved water retention in the root zone”
e1“yield and quality of broccoli”
Claim · model-written summary
Humic substances increased broccoli marketable yield and head diameter.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- application of HSe0
- Outcome
- total marketable yield and head diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of HS increased total marketable yield and head diameter of broccoli”
Claim · model-written summary
Humic substances increased broccoli soluble solids, protein and vitamin C.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Treatment
- application of HSe0
- Outcome
- total soluble solids, protein, and vitamin Ce0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of HS increased total marketable yield and head diameter of broccoli as well as quality parameters ( i.e., total soluble solids, protein, and vitamin C)”
Claim · model-written summary
Nutrient concentrations were higher in broccoli heads with humic-substance fertigation.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Organ / stage
- broccoli headse0
- Treatment
- application of HSe1
- Outcome
- nutrient concentrationse0
- Direction
- Highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher nutrient concentrations were found in the broccoli heads”
e1“application of HS”
Claim · model-written summary
Plant-available soil nutrients were higher after harvest with humic-substance fertigation.
- Taxon
- broccoliBrassica oleracea var. italicae2
- Treatment
- application of HSe1
- Outcome
- plant‐available nutrients in soil after harvestinge0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“concentrations of plant‐available nutrients in soil after harvesting were also higher”
e1“application of HS”
e2“broccoli heads”
Claim · model-written summary
The authors recommend humic-substance fertigation to improve soil water and nutrient status and plant growth.
- Taxon
- broccoliBrassica oleracea var. italicae1
- Outcome
- improve soil water and nutrient status leading to better plant growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HS fertigation can be judged as an interesting option to improve soil water and nutrient status leading to better plant growth”
e1“broccoli heads”
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