Abstract
This research was carried out aiming at evaluating the effects of nitrate and ammonium ions on nutrient accumulation, biochemical components and yield of Italian zucchini (cv. Caserta) grown in a hydroponic system under salt stress conditions. The experiment was carried out in a greenhouse utilizing an experimental design in randomized blocks, arranged in a 2 x 5 factorial scheme, with 4 replications. The treatments consisted of two forms of nitrogen (nitrate - NO3- and ammonium - NH4+) and 5 electrical conductivity levels of irrigation water (ECw) (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1). The analysis of the results indicated that supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane and reduction in accumulation of macronutrients and higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants. Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant. The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity, since its fertilization exclusively with this form of nitrogen inhibits its production, being the NO3- form the most suitable for the cultivation of the species.
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Claims 8
Claim · model-written summary
Supplying N exclusively as NH4+ caused greater damage to the leaf membrane in Italian zucchini.
- Taxon
- Italian zucchinit0
- Treatment
- supply of N exclusively in NH4+ forme1
- Outcome
- damage to the leaf membranee1
- Direction
- greatere1
Not reportedComparator
Verbatim
e1“supply of N exclusively in NH4+ form promotes greater damage to the leaf membrane”
t0“Italian zucchini”
Claim · model-written summary
Supplying N exclusively as NH4+ reduced accumulation of macronutrients in zucchini shoots.
- Taxon
- Italian zucchinit0
- Treatment
- supply of N exclusively in NH4+ forme1
- Outcome
- accumulation of macronutrientse2
- Direction
- reductione2
Not reportedComparator
Verbatim
e1“supply of N exclusively in NH4+ form”
e2“reduction in accumulation of macronutrients”
t0“Italian zucchini”
Claim · model-written summary
Supplying N exclusively as NH4+ gave higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots of zucchini plants.
- Taxon
- Italian zucchinit0
- Organ / stage
- shootse2
- Treatment
- supply of N exclusively in NH4+ forme1
- Outcome
- Na+/K+, Na+/Ca++ and Na+/Mg++ ratiose2
- Direction
- highere2
Not reportedComparator
Verbatim
e1“supply of N exclusively in NH4+ form”
e2“higher Na+/K+, Na+/Ca++ and Na+/Mg++ ratios in the shoots”
t0“Italian zucchini”
Claim · model-written summary
Irrigation water electrical conductivity above 2.0 dS m-1 reduced the accumulation of nutrients in the shoot of Italian zucchini.
- Taxon
- Italian zucchinie1
- Treatment
- Electrical conductivity of irrigation water above 2.0 dS m-1e1
- Outcome
- accumulation of nutrients in shoote1
- Direction
- reducese1
Not reportedComparator
Verbatim
e1“Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant”
Claim · model-written summary
Irrigation water electrical conductivity above 2.0 dS m-1 reduced the yield of Italian zucchini.
- Taxon
- Italian zucchinie1
- Treatment
- Electrical conductivity of irrigation water above 2.0 dS m-1e1
- Outcome
- yielde1
- Direction
- reducese1
Not reportedComparator
Verbatim
e1“Electrical conductivity of irrigation water above 2.0 dS m-1 reduces the accumulation of nutrients in shoot and yield of Italian zucchini plant”
Claim · model-written summary
The toxicity of NH4+ in Italian zucchini overlaps the toxicity of salinity.
Verbatim
e1“The toxicity of NH4+ under Italian zucchini plants overlap the toxicity of the salinity”
Claim · model-written summary
Fertilization exclusively with NH4+ inhibited zucchini production.
- Taxon
- Italian zucchinit0
- Treatment
- fertilization exclusively with this form of nitrogene1
- Outcome
- productione1
- Direction
- inhibitse1
Not reportedComparator
Verbatim
e1“fertilization exclusively with this form of nitrogen inhibits its production”
t0“Italian zucchini”
Claim · model-written summary
The NO3- form of nitrogen is the most suitable for cultivation of Italian zucchini.
Verbatim
e1“being the NO3- form the most suitable for the cultivation of the species”
t0“Italian zucchini”