Abstract
IntroductionPotato plays an important role in global food security and it growth and tuber yield are influenced by many biotic and abiotic stresses, such as drought and low or high temperatures. Potato in Khuzestan province is facing unfavorable weather conditions, especially high temperature. Humic acid and amino acid, as well-known biostimulants, can directly or indirectly influence on plant growth and yield and significantly mitigates the injuries caused by abiotic stresses. In some studies, the use of humic acid has been reported increase root length, improve nutrient uptake, and increase chlorophyll synthesis. Amino acids in potato plant increase natural resistance to stresses. It seems that biostimulants and some nutrition elements can be applied as a strategy to reduce the negative effects of high temperatures. Therefore, this study was conducted to evaluate the effect of plant growth biostimulants on growth indices, yield and yield components of potato cultivars in Khuzestan region.Materials and MethodsThis research was conducted in two studies. First study was carried out as a factorial experiment in a randomized complete block design (RCBD) with two factors including 16 treatments in three replications at Behbahan Agricultural Research Station in 2019-2020. The first factor was application of plant growth biostimulants at eight levels: control (application of chemical fertilizers according to soil test), humic acid, free amino acid (L), amino acid-Zn, amino acid-K, amino acid-Ca, amino acid-K-Ca and application of all studied biostimulants (except free amino acid). The second factor consisted of two potato cultivars: 'Ottawa and Sante'. In the second study, growth analysis was done in a split plot factorial based on RCBD with three replications. Main plot consisted of five sampling periods with 15 days intervals. Sub plot consisted of combination of eight plants growth biostimulants and two cultivars of potato as factorial. Tubers were planted at mid January. One week before harvesting haulms were defoliated and tubers were harvested at mid May. Humic acid was used as fertigation at 10 kg.ha-1 in the early stages of growth. Foliar application of amino acid, amino acid-Zn was done at two stages, tuber initiation and the beginning of tuber bulking. Foliar application of amino acid-K, amino acid-Ca was done at two stages, the beginning and middle of tuber bulking. Amino acid and amino acid-nutritional element were done at a concentration of 0.5 %. Varince analysis were done by MSTATC statistical software and meanes were compared using Duncan’s multiple test range at the 5% level.Results and DiscussionThe results showed that in two cultivars, application of all studied biostimulants (except free amino acid) significantly increased tuber yield compared with control. In Sante cultivar, the highest yield was dedicated in the treatment of combined, and the yield of this treatment was significantly higher than the yield of alone application of these substances. In Ottawa cultivar, the highest yield was achieved by application of combined biostimulants, but the differences of tuber yield among this treatment and treatments of amino acid-K, amino acid-Ca and amino acid-K-Ca and humic acid were not significant. The results of growth analysis showed, in the most sampling periods, the highest tuber and crop growth rate were recorded in the combined treatment. Therefore the highest tuber yield was observed in this treatment. In the first and second sampling periods, application of humic acid or amino acid-Zn were more effective than other treatments. But, in the third and fourth sampling periods, treatments of amino acid-K, amino acid-Ca were more effective in comparision to alone of these substances. In different sampling periods, tuber and crop growth rate in Ottawa cultivar was significantly higher than Sante cultivar.ConclusionAccording to results, in Sante cultivar, the combined treatment of plant growth biostimulants produced the highest yield in comparision to any individuals of these substances. Therefore, use of humic acid as fertigation in the early stages of growth and foliar application of amino acid- Zn at two stages tuber initiation and the beginning of tuber growth and amino acid-K-Ca at two stages the beginning and middle of tuber growth, are recommended. In Ottawa cultivar, the differences of tuber yield among treatment of combined application of growth biostimulants, amino acid-K, amino acid-Ca and amino acid-K-Ca and humic acid were not significant. Therefore, based on the finding of the present study, it could be concluded that treatments of amino acid-K, amino acid-Ca or humic acid may be an effective growth biostimulants for improving yield of Ottawa cultivar.
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Claims 14
Claim · model-written summary
The combination of biostimulants significantly increased tuber yield in both cultivars over control.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- application of all studied biostimulants (except free amino acid)e0
- Outcome
- tuber yielde0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in two cultivars, application of all studied biostimulants (except free amino acid) significantly increased tuber yield compared with control.”
t0“Potato cultivars”
Claim · model-written summary
The combined treatment yielded most for Sante and exceeded separate applications significantly.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Santee0
- Treatment
- treatment of combinede0
- Outcome
- yielde0
- Direction
- highere0
- Comparator
- alone application of these substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Sante cultivar, the highest yield was dedicated in the treatment of combined, and the yield of this treatment was significantly higher than the yield of alone application of these substances.”
t0“Potato cultivars”
Claim · model-written summary
Combined biostimulants gave the highest tuber yield in Ottawa.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Ottawae0
- Treatment
- application of combined biostimulantse0
- Outcome
- yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Ottawa cultivar, the highest yield was achieved by application of combined biostimulants”
t0“Potato cultivars”
Claim · model-written summary
Ottawa tuber yield with the combined treatment did not differ significantly from amino acid-K, amino acid-Ca, amino acid-K-Ca or humic acid.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- this treatmente0
- Outcome
- tuber yielde0
- Comparator
- treatments of amino acid-K, amino acid-Ca and amino acid-K-Ca and humic acide0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the differences of tuber yield among this treatment and treatments of amino acid-K, amino acid-Ca and amino acid-K-Ca and humic acid were not significant.”
t0“Potato cultivars”
Claim · model-written summary
Combined treatment gave the highest tuber growth rate in most sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- combined treatmente0
- Outcome
- tuber and crop growth ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the most sampling periods, the highest tuber and crop growth rate were recorded in the combined treatment.”
t0“Potato cultivars”
Claim · model-written summary
Combined treatment gave the highest crop growth rate in most sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- combined treatmente0
- Outcome
- crop growth ratee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the most sampling periods, the highest tuber and crop growth rate were recorded in the combined treatment.”
t0“Potato cultivars”
Claim · model-written summary
Humic acid was more effective than other treatments in the first and second sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- application of humic acide0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the first and second sampling periods, application of humic acid or amino acid-Zn were more effective than other treatments.”
t0“Potato cultivars”
Claim · model-written summary
Amino acid-Zn was more effective than other treatments in the first and second sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- amino acid-Zne0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the first and second sampling periods, application of humic acid or amino acid-Zn were more effective than other treatments.”
t0“Potato cultivars”
Claim · model-written summary
Amino acid-K was more effective in the third and fourth sampling periods than separate substances.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- amino acid-Ke0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Comparator
- alone of these substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the third and fourth sampling periods, treatments of amino acid-K, amino acid-Ca were more effective in comparision to alone of these substances.”
t0“Potato cultivars”
Claim · model-written summary
Amino acid-Ca was more effective in the third and fourth sampling periods than separate substances.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- amino acid-Cae0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Comparator
- alone of these substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the third and fourth sampling periods, treatments of amino acid-K, amino acid-Ca were more effective in comparision to alone of these substances.”
t0“Potato cultivars”
Claim · model-written summary
Ottawa tuber growth rate exceeded Sante significantly across sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Ottawae0
- Outcome
- tuber and crop growth ratee0
- Direction
- highere0
- Comparator
- Sante cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In different sampling periods, tuber and crop growth rate in Ottawa cultivar was significantly higher than Sante cultivar.”
t0“Potato cultivars”
Claim · model-written summary
Ottawa crop growth rate exceeded Sante significantly across sampling periods.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Ottawae0
- Outcome
- crop growth ratee0
- Direction
- highere0
- Comparator
- Sante cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In different sampling periods, tuber and crop growth rate in Ottawa cultivar was significantly higher than Sante cultivar.”
t0“Potato cultivars”
Claim · model-written summary
The authors recommend staged fertigation with humic acid and foliar applications of amino acid-Zn and amino acid-K-Ca for Sante.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Santee1
- Outcome
- use of humic acid as fertigation in the early stages of growth and foliar application of amino acid- Zn at two stages tuber initiation and the beginning of tuber growth and amino acid-K-Ca at two stages the beginning and middle of tuber growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“use of humic acid as fertigation in the early stages of growth and foliar application of amino acid- Zn at two stages tuber initiation and the beginning of tuber growth and amino acid-K-Ca at two stages the beginning and middle of tuber growth, are recommended.”
t0“Potato cultivars”
e1“in Sante cultivar”
Claim · model-written summary
The authors suggest amino acid-K, amino acid-Ca or humic acid to improve Ottawa yield.
- Taxon
- PotatoSolanum tuberosumt0
- Material
- Ottawae0
- Outcome
- improving yield of Ottawa cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato cultivars”
e0“treatments of amino acid-K, amino acid-Ca or humic acid may be an effective growth biostimulants for improving yield of Ottawa cultivar.”
The same questions in other papers
amino acid · yield · Solanum tuberosum (potato)Results agree
1 paper in the same direction as this paper
- positive
other · yield · Solanum tuberosum (potato)Results differ
72 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- no effect
74 papers more in this group
See all 78 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.