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Copyright of Revista Ciência Agronômica is the property of Revista Ciencia Agronomica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Comunicata Scientiae is the property of Comunicata Scientiae and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Verde de Agroecologia e Desenvolvimento Sustentável is the property of Revista Verde de Agroecologia e Desenvolvimento Sustentavel and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Salt stress suffered by plants due to concentration of irrigation water salts reduces the ability of exploitation of cultures especially in arid and semiarid regions. Thus, the aim of this study was to evaluate the effect of salinity of irrigation water on the growth of rootstock of guava 'Crioula' associated with increasing doses of nitrogen fertilizer. The experiment was conducted in plastic pots under greenhouse conditions in the CCTA / UFCG. We used the experimental randomized block design, with the treatments in a factorial 5 × 4, corresponding to five levels of electrical conductivity of the water - CEa (0.3; 1.1; 1.9; 2.7 and 3.5 dS m-1) and four nitrogen rates (70, 100, 130 and 160% of the recommended dose N for guava cultivation seedlings cv. Paluma) with 4 replications and 5 plants per plot. The dose of 70 % of N- ( 541.1 mg N dm-1 of soil ) provides greater production plant leaf area, height 145 DAE, but to stem diameter was significant in both periods studied the rootstock guava cv. Crioula. Irrigation CEa above 0.3 dS m-1 negatively affect the number of leaves, leaf area, stem diameter, leaf area ratio and absolute growth rate of stem diameter. There was interaction between the factors salinity of irrigation water and nitrogen fertilization for variable number of leaves at 145 DAE rootstock of guava "Crioula". [ABSTRACT FROM AUTHOR]

The effects of salts in the soil, causing variations in structure, permeability and aeration of the soil indirectly affect the growth of plants. Thus the increased nitrogen dosing as an isolated factor, can promote greater efficiency in the production of seedlings. In this sense, the aim of this work was to analyze the influence of irrigation water salinity associated with increasing doses of nitrogen on the development of rootstock of guava genotypes 'Crioula'. The experiment was conducted in plastic pots under greenhouse conditions in the CCTA / UFCG. We used the experimental randomized block design, with the treatments in a factorial 5 x 4, corresponding to five levels of electrical conductivity of the water - CEa (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four nitrogen rates (70, 100, 130 and 160% of the recommended dose N for guava cultivation seedlings cv. Paluma) with 4 replications and 5 plants per plot. There was no significant interaction between the factors salinity of irrigation water and nitrogen fertilization on growth rootstock genotype of guava "Crioula". Increased CEa from 0.3 dS m-1 affects negatively and linearly stem diameter (DC), number of leaves (NF), absolute growth rate (TCAAP) and relative plant height (TCRap), the height growth balance of plant / stem thickness and dry mass export of the sheet for the rest of the plant (RMF). The dose of 70% of N (541.1 mg N dm-1 soil) provides higher values of DC, NC, TCAap and TCRap rootstock of guava "Crioula". [ABSTRACT FROM AUTHOR]