Abstract
Results of two studies are reported here, a greenhouse study and a field study. In the greenhouse study, dry matter yield and nitrogen (total and 15N) uptake of leaves, stems and roots of tomato plants (Lycopersicum esculentum Mill., cv. Columbia) subjected to saline stress by NaCl were studied. The integrated effects of responses of these tissues to salinity on the whole plant basis and levels of Na⁺, Cl⁻ and K⁺ accumulation in these tissues were also studied. The treatments consisted of low (control, 0.3 bar), medium (4.3 bars), and high (8.3 bars) salinity. The saline treatments were prepared by adding NaCl to nutrient solution in sand culture. The plants were 80 days old at the start of the treatments and each was in a pot containing 1.8 kg of quartz sand. The ¹⁵N was provided to plants by adding K¹⁵NO₃ to the pots and the 15N treatment continued with the saline treatments up to 30 days. The plants were harvested at each 5-day interval during the treatment period. Dry matter production and nitrogen (total and ¹⁵N) uptake were significantly lower for saline treatments as compared with the control. Differences in dry matter production and ¹⁵N uptake on whole plant basis appeared in the latter part of the treatment period between the two saline treatments. For most of the parameters studied, the leaves were found to be affected most by salinity, the roots were intermediate in their response and the stems were the least affected by salinity. The effect of salinity on the studied parameters were attributed to osmotic effects and specific ion effects of Na⁺ and/or Cl⁻. A field study with two cultivars--Columbia and Pearson was conducted at the Safford Agricultural Center. Three N treatments were used: 0 kg N/ha, 84 kg N/ha and 168 kg N/ha and two treatments consisting of two water sources--river water with an EC of 1.15 dS/m and more saline well water of EC of 2.21 dS/m. Columbia had a significantly higher yield of tomatoes than Pearson for both water types. The N treatments had no effect on tomato yield apparently due to high residual N remaining in the field from the previous crop. Commercially acceptable fresh market yields were approached with both varieties and waters in spite of moderate salinity and sodium under heavy textural soil conditions, high temperatures and the presence of certain diseases in the area.
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Claims 7
Claim · model-written summary
Salinity significantly lowered tomato dry matter production.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- saline treatmentse0
- Outcome
- Dry matter productione0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter production and nitrogen (total and ¹⁵N) uptake were significantly lower for saline treatments as compared with the control.”
t0“tomatoes”
Claim · model-written summary
Salinity significantly lowered total and 15N uptake.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- saline treatmentse0
- Outcome
- nitrogen (total and ¹⁵N) uptakee0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter production and nitrogen (total and ¹⁵N) uptake were significantly lower for saline treatments as compared with the control.”
t0“tomatoes”
Claim · model-written summary
The two saline treatments diverged in whole-plant dry matter production late in treatment.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- two saline treatmentse0
- Outcome
- dry matter production and ¹⁵N uptake on whole plant basise0
- Qualifier
- latter part of the treatment periode0
- Comparator
- two saline treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in dry matter production and ¹⁵N uptake on whole plant basis appeared in the latter part of the treatment period between the two saline treatments.”
t0“tomatoes”
Claim · model-written summary
Leaves responded most and stems least to salinity for most studied parameters.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- leaves were found to be affected most by salinity, the roots were intermediate in their response and the stems were the least affected by salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaves were found to be affected most by salinity, the roots were intermediate in their response and the stems were the least affected by salinity.”
t0“tomatoes”
Claim · model-written summary
Columbia yielded significantly more tomatoes than Pearson under both water types.
- Taxon
- tomatoesSolanum lycopersicume0
- Material
- Columbiae0
- Outcome
- yield of tomatoese0
- Direction
- highere0
- Comparator
- Pearsone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Columbia had a significantly higher yield of tomatoes than Pearson for both water types.”
t0“tomatoes”
Claim · model-written summary
Nitrogen treatments did not affect tomato yield.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- N treatmentse0
- Outcome
- tomato yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N treatments had no effect on tomato yield apparently due to high residual N remaining in the field from the previous crop.”
t0“tomatoes”
Claim · model-written summary
Both cultivars approached commercially acceptable fresh-market yields with both waters.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- Commercially acceptable fresh market yieldse0
- Qualifier
- both varieties and waterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Commercially acceptable fresh market yields were approached with both varieties and waters in spite of moderate salinity and sodium under heavy textural soil conditions, high temperatures and the presence of certain diseases in the area.”
t0“tomatoes”
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