Physiological responses of lima bean subjected to salt and water stresses

Barbosa

et al. 2022

Agraria

The use of saline water negatively affects gas exchange and plant growth. However, fertilization with a mineral source has been used to mitigate salt stress on agricultural crops. The objective of this study was to evaluate the gas exchange and the initial growth of cowpea beans submitted to different irrigation strategies with saline water and phosphate fertilization. The experiment was conducted from October to December 2019, in full sun in the experimental area belonging to the Universidade da Integração Internacional da Lusofonia Afro-Brasileira (UNILAB), Redenção, CE, Brazil. The experimental design was entirely randomized in a 4 × 2 factorial scheme, referring to four irrigation strategies: E1 = irrigation with low-salinity water (0.3 dS m -1 ) at germination, initial growth, and preflowering stages; E2 = saline water (3.2 dS m -1 ) at preflowering only; E3 = saline water (3.2 dS m -1 ) on germination and initial growth; E4 = saline water (3.2 dS m -1 ) in the three phases, and two doses of phosphate fertilization (P1 = 50% of the recommended phosphorus dose and P2 = 100% of the recommended phosphorus dose), with four repetitions. Continuous salt stress in phenological phases negatively affects plant height, photosynthesis, transpiration, stomatal conductance, and leaf temperature of the cowpea crop. The dose of 100% phosphate fertilization mitigates the effects of continuous salt stress on chlorophyll pigment production.

Section: Resultsmentioning

confidence: 95%

Irrigation strategies with saline water and phosphate fertilization in cowpea culture

Ribeiro

Barbosa

et al. 2022

Agraria

“…The results show that the cultivars Branquinha, Espírito Santo and Orelha-de-vó adapted better compared to Manteiguinha. This morphophysiological adaptation may result in greater plant efficiency in photosynthetic processes and in the transport of organic solutes in plant tissues (PEREIRA FILHO et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Salt water irrigation in different cultivars of lima bean

Goes

Revista Ciência Agronômica

Freire³

et al. 2021

Lima bean (Phaseolus lunatus L.) is a crop with great economic and social importance for the Brazilian Northeast. The water crisis in recent years has affected crop production, especially in the semi-arid region. Thus, the use of lower quality waters (saline) becomes a necessary alternative, but it can affect the growth and yield of agricultural crops. The objective of this study was to evaluate the effect of salt stress on the initial growth and biomass accumulation of four lima bean cultivars. The experiment was carried out in a protected environment in a completely randomized experimental design in a 5 x 4 factorial scheme, with four replicates. The treatments consisted of 5 salinity levels in irrigation water with electrical conductivity (ECw) of 1.0, 2.0, 3.0, 4.0 and 5.0 dS m -1 and four cultivars: Branquinha (C1), Manteiguinha (C2), Espírito Santo (C3) and Orelha-de-vó (C4). The variables analyzed were plant height, number of leaves, leaf area, stem diameter, root length, shoot dry mass, root dry mass and total dry mass. At the end of the experiment, electrical conductivity of the soil saturation extract was evaluated. The cultivar Manteiguinha was more tolerant to salinity than the others, considering the variables number of leaves and plant height. However, it was not possible to identify variations in the tolerance of the four lima bean cultivars based on biomass production, indicating the need for further studies that can prove the existence of genetic variability in relation to the effects of salt stress on this species

“…The use of irrigated agriculture becomes fundamental for a safe production (Léllis et al, 2022;Lacerda et al, 2020). This practice becomes indispensable in regions that present a high climatic variability, as is the case of the semi-arid region of Brazil; however, the vast majority of water sources available for irrigation in this region present a high content of salts (Fernandes et al, 2016;Pereira et al, 2019;Dias et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Physiological responses of the beet crop under agricultural environment and saline stress

Oliveira

et al. 2022

Rev. ambiente água

The deleterious effects of salts on plants exposed to high solar radiation tend to be more accelerated due to the increase of toxic ions in the aerial plant part. Consequently, the physiological and biochemical processes will be affected. These effects can be minimized, however, with the use of management strategies, such as the use of a shading screen and a protected environment. In this sense, the objective of this work was to evaluate the physiological responses of sugar beet cultivated in different environments and irrigated with saline water. The experiment was conducted in an experimental design entirely randomized, using the factorial scheme 3 × 2, equivalent to three environments (FS = full sun; SSOS = shading screen open on the sides and PE = protected environment) and two electrical conductivities of the irrigation water (0.5 and 6.2 dS m-1), with four repetitions. At 45 days after sowing (DAS) the following variables were analyzed: stomatal conductance, liquid photosynthesis, transpiration, internal CO2 concentration, leaf temperature, instantaneous water use efficiency, instantaneous carboxylation efficiency, intrinsic water use efficiency, and relative chlorophyll index. Irrigation with water of higher salinity negatively affected stomatal conductance, net photosynthesis, leaf temperature and instantaneous water use efficiency of sugar beet plants grown in a full sun environment. The protected environment and open shading on the sides partially mitigated the deleterious effects of salinity. Keywords: Beta vulgaris L., gas exchange, salinity levels.