Morfofisiologia e produção do algodoeiro herbáceo irrigado com águas salinas eadubado com nitrogênio

Abstract

The high salt concentrations found in irrigation formation of water in semi-arid regions lead to changes on crops growth and development and can lead to halomorphicsoils formation. In this context, it was proposed to evaluate the morphophysiology and production of colored herbaceous cotton BRS Topaz fertilized with nitrogen under a saline-sodic soil and submitted to the irrigation with water of different salinities. The experiment was conducted in an eutrophic sandy quartzarênico Neossol in the municipality of Campina Grande, Paraíba, Brazil, adopting a completely randomized design in 5x5 factorial with three repetitions, with five salinity levels of the the irrigation water (0 7; 2.7; 4.7; 6.7 and 8.7 dS m-1 at 25°C) and five levels of nitrogen (40; 60; 80; 100 and 120 mg of N kg-1). Regarding cotton growth, no effect was observed for the interaction between salinity and soil nitrogen doses. The absolute growth rate for height, stem diameter and leaf area decreased with an increase in the irrigation water electrical conductivity, being leaf area the most affected variable.The number of bolls and the cotton seed production per plant decreased with the salinity increase and increased with in increase of nitrogen fertilization.

Growth and Photosynthetic Pigments of Cotton Cultivars Irrigated with Saline Water

“…These results corroborate with those found by [24] who also verified reduction in the leaf area of the cotton with the increase of the salinity of the water.…”

Initial Growth and Gas Exchanges of Plants of Colored Cotton Submitted to Saline Stress

“…According to [13], the reduction of growth of the plants when submitted to salinity conditions may be related to lower water absorption due to the decrease of the osmotic potential of the soil solution. The decrease of the leaf area and the Similar results were obtained by [15], which studied the morphology and production of BRS Topazio colored cotton, irrigated with saline waters, observed reductions in plant height, stem diameter and leaf area as a function of salinity increase.…”

Características Biométricas E Acúmulo De Fitomassa Da Berinjeleira Sob Irrigação Com Água Residuária E Doses De Nitrogênio E Fósforo

“…Como citado anteriormente, os aumentos observados ocorreram devido à atuação do N em múltiplas funções estruturais e de constituintes celulares, que estão intimamente relacionados com a ativação de muitas enzimas, além da sua participação nos processos essenciais das plantas, como fotossíntese, respiração, influência na taxa de expansão, diferenciação celular e síntese de proteína (SANTOS et al, 2016;SOUZA et al, 2017). Já os resultados de decréscimos obtidos com doses acima do limite ótimo, provavelmente, estão relacionados com grande quantidade de N no solo, uma vez que os excessos de adubos nitrogenados podem ocasionar o desequilíbrio nutricional, principalmente quando são fornecidos na forma de ureia (ARAÚJO et al, 2012), predispondo nas plantas alterações de crescimento, retardo na senescência, mudanças na morfologia e fisiologia (ABRANTES, 2014;SANTOS et al, 2016;SOUZA et al, 2017).…”

“…Já os resultados de decréscimos obtidos com doses acima do limite ótimo, provavelmente, estão relacionados com grande quantidade de N no solo, uma vez que os excessos de adubos nitrogenados podem ocasionar o desequilíbrio nutricional, principalmente quando são fornecidos na forma de ureia (ARAÚJO et al, 2012), predispondo nas plantas alterações de crescimento, retardo na senescência, mudanças na morfologia e fisiologia (ABRANTES, 2014;SANTOS et al, 2016;SOUZA et al, 2017).…”