Abstract
ABSTRACT The cultivation of irrigated guava in semi-arid areas highlights the need for information regarding its responses to irrigation water quality and the fertilization management that enables its exploitation. Thus, this study aimed to evaluate the effect of water salinity and nitrogen (N) doses on the growth and physiology of the guava cv. ‘Paluma’. The experiments was conducted in drainage lysimeters under field conditions in an experimental area at the Center of Sciences and Agri-Food Technology of the Federal University of Campina Grande (CCTA/UFCG), Campus II, in Pombal, PB, Brazil. The experiment had a randomized block design, and treatments consisted of a 5 x 4 factorial arrangement corresponding to five levels of irrigation water electrical conductivity, ECw (0.3, 1.1, 1.9, 2.7, and 3.5 dS m-1), and four N doses (70, 100, 130, and 160% of the recommended N dose). The 100% dose corresponded to 541.1 mg of N dm-3 of soil. Increments in irrigation water salinity from 0.3 dS m-1 led to a reduction in stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, instantaneous water use efficiency, the number of leaves and branches, stem diameter, and absolute and relative growth rates. Nitrogen doses ranging from 378.7 to 865.7 mg of N dm-3 of soil did not affect gas exchange and plant growth. Although ‘Paluma’ guava growth was affected by increases in water salinity, these plants can be irrigated using water of up to 1.42 dS m-1 with an acceptable reduction of 10% in growth variables. The interaction between irrigation water salinity and N fertilization had no significant effect on any of the variables studied.
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Claims 5
Claim · model-written summary
Increasing irrigation water salinity reduced stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, and instantaneous water use efficiency.
- Taxon
- guava
Psidium guajavat0 - Treatment
- irrigation water salinitye0
- Outcome
- stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, instantaneous water use efficiencye0
- Direction
- reductione0
- Comparator
- 0.3 dS m-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increments in irrigation water salinity from 0.3 dS m-1 led to a reduction in stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, instantaneous water use efficiency”
t0“GUAVA”
Claim · model-written summary
Increasing irrigation water salinity reduced leaf and branch number, stem diameter, and growth rates.
- Taxon
- guavaPsidium guajavat0
- Treatment
- irrigation water salinitye0
- Outcome
- the number of leaves and branches, stem diameter, and absolute and relative growth ratese0
- Direction
- reductione0
- Comparator
- 0.3 dS m-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increments in irrigation water salinity from 0.3 dS m-1 led to a reduction in stomatal conductance, internal CO2 concentration, CO2 assimilation rate, transpiration, instantaneous water use efficiency, the number of leaves and branches, stem diameter, and absolute and relative growth rates”
t0“GUAVA”
Claim · model-written summary
Nitrogen doses from 378.7 to 865.7 mg of N dm-3 of soil did not affect gas exchange or plant growth.
- Taxon
- guavaPsidium guajavat0
- Treatment
- Nitrogen doses ranging from 378.7 to 865.7 mg of N dm-3 of soile0
- Outcome
- gas exchange and plant growthe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen doses ranging from 378.7 to 865.7 mg of N dm-3 of soil did not affect gas exchange and plant growth”
t0“GUAVA”
Claim · model-written summary
The salinity by nitrogen fertilization interaction was not significant for any studied variable.
- Taxon
- guavaPsidium guajavat0
- Treatment
- irrigation water salinity and N fertilizatione0
- Outcome
- any of the variables studiede0
- Direction
- no significant effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between irrigation water salinity and N fertilization had no significant effect on any of the variables studied”
t0“GUAVA”
Claim · model-written summary
The authors judged irrigation water up to 1.42 dS m-1 acceptable for Paluma guava with a 10% reduction in growth variables.
- Taxon
- guavaPsidium guajavat0
- Outcome
- can be irrigated using water of up to 1.42 dS m-1e0
- Value
- 1.42 dS m-1e0
- Qualifier
- acceptable reduction of 10% in growth variablese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these plants can be irrigated using water of up to 1.42 dS m-1 with an acceptable reduction of 10% in growth variables”
t0“GUAVA”
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