Saline Water Irrigation and Nitrogen Fertilization on the Cultivation of Colored Fiber Cotton

Abstract

In Northeast Brazil, the cultivation of colored fiber cotton has stood out as one of the agricultural activities of expressive importance because its fiber has various applications in the industry and it is a labor-demanding crop. In this context, this study aimed to evaluate the growth, water consumption, water use efficiency and production of the colored fiber cotton cv. ‘BRS Rubi’, as a function of saline water irrigation and nitrogen (N) doses. The experiment was conducted in lysimeters, under greenhouse conditions, in eutrophic Regolithic Neosol, with a sandy loam texture, in Campina Grande-PB, Brazil. The plants were irrigated using water with electrical conductivities (ECw) of 5.1, 6.1, 7.1, 8.1 and 9.1 dS m-1 and fertilized with N doses (ND) of 65, 100, 135, 170 and 205 mg N kg-1 soil, in a completely randomized block design, with three replicates. Irrigation using water with an ECw above 5.1 dS m-1, hampered growth, water consumption and water use efficiency of ‘BRS Rubi’ cotton. Among the organs, the cotton root system was less affected by the salt stress in comparison to the shoots. N fertilization did not mitigate the deleterious effect of salt stress on cotton growth, water consumption, water use efficiency and production. The interaction between water salinity and N fertilization had positive effects on total weight of seeds and lint, and the highest values were obtained in plants irrigated with water of ECw 7.6 and 7.5 dS m-1 and ND of 65 mg N kg-1 of soil.

Nutritional and fermentative profile of forage sorghum irrigated with saline water

“…It is strongly influenced by a negative water balance coming from low annual mean precipitations of around 800 mm and annual mean temperatures from 23 to 27 °C, with an evaporation of 2000 mm/year, mean relative air humidity around 50%, and mean insolation of 2800 hour/year. Because of these characteristics and a regime of irregular and scarce precipitations, water sources are considered insufficient in the region (Andrade et al 2018;Lima et al 2018a).…”

Induction of tolerance to salt stress in soursop seedlings using hydrogen peroxide

“…The reduction in the leaf area is related to the accumulation of salts in the soil, which negatively affects water absorption by the plants, compromising the photosynthetic and metabolic processes, resulting in the reduction of the photosynthetic apparatus (Bezerra et al, 2018). Furthermore, the decrease in the leaf area is a mechanism adopted by the plant to protect itself and/or acclimate to the salt stress condition, since the reduction in the LA minimizes the water losses through transpiration and maintains a high cell water potential (Lima et al, 2018). Similar results were observed by Veloso et al (2018) while studying the effect of salt stress and nitrogen fertilization on the formation of seedlings of the soursop cv.…”

Salinização secundária no semiárido e seus impactos no solo, na agricultura e cultivo das plantas – uma revisão

“…Nesse sentido Lima et al (2018) avaliaram o crescimento e a produção do algodoeiro cv. BRS Rubi irrigado com águas salinas (5,1; 6,1; 7,1; 8,1 e 9,1 dS m -1 ) e doses de nitrogênio (65; 100; 135; 170 e 205 mg de N kg -1 ) em casa de vegetação.…”