Search

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 Revista Brasileira de Agricultura Irrigada - RBAI is the property of Revista Brasileira de Agricultura Irrigada - RBAI 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.)

The occurrence of long periods of drought and the annual irregularity of precipitation in the semi-arid region of the Brazilian Northeast make irrigation practice essential to ensure safe agricultural production, however, the available water sources are not always of good quality. In this way, the objective of this work was to evaluate the effects of irrigation with waters of different saline levels associated with nitrogen rates on the growth of 'Formosa' papaya seedlings under northeastern semiarid conditions. The experiment was carried out in plastic bags under protected environment conditions at the Center of Science and Technology Agrifood of the Federal University of Campina Grande, Pombal - PB campus. The experimental design was a randomized block design, in a 5 x 4 factorial scheme, with four replications, being the treatments composed of five levels of electrical conductivity of the water (EC, 0.3, 1.1, 1.9, 7 and 3.5 dS m-1) and four nitrogen doses (70, 100, 130 and 160% N recommended). The electrical conductivity of irrigation water from 0.3 dS m-1 negatively affected plant height and dry stem biomass. It is observed that the dose of 70% of N and of 100% provided, respectively, greater dry matter production of root and number of leaves. No significant effect was observed for the variables stem diameter and dry stem biomass submitted to different CEa and nitrogen fertilization; As well as, there was no interaction between the factors (CEa x Fertilization with N) on the growth of the seedlings. The variables NF, FFF, FSF, FSR presented tolerance to the increase of electrical conductivity of irrigation water. [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]

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.)