Recuperação de solos afetados por sais usando água de qualidade inferior

Salinity and soil sodicity promote high losses in the quality of seedlings of most commercially important plants, including yellow passion fruit. An experiment was conducted in a greenhouse environment to evaluate the effects of bovine biofertilizer in the emergence and morphological and physiological variables of yellow passion fruit seedlings in an extremely sodic soil and in an extremely saline soil. The treatments were arranged in a randomized block design with three replications and six plants per plot, using a 2 × 2 factorial design referring to a saline-sodic soil and a saline soil with and without bovine biofertilizer for an evaluation in three periods: 40, 60 and 80 days after sowing. The biofertilizer was diluted in a non-saline water (ECw dS = 0.31 m-1) in a 1:1 ratio and applied to the soil surface only once, 24 hours before sowing, with a volume corresponding to 10% of the substrate volume. The seedlings were irrigated with non-saline water, providing an evapotranspirated volume every 24 hours based on the average value obtained by the process of weighing the units of each treatment. From the results, the biofertilizer more efficiently mitigated the salinity of the soil sodicity. In the treatments without organic inputs, seedlings did not emerge in the saline-sodic soil. In the saline soil, seedlings that emerged did not survive the damaging effects of salinity. Despite attenuating the degenerative effects of salinity on plants, the bovine biofertilizer contributes to the increase of saline content in the soil.

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Características físicas de solos salino-sódicos do semiárido pernambucano em função de diferentes níveis de gesso

Vasconcelos

Barros

Silva

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOObjetivou-se, com este trabalho, avaliar a eficiência da aplicação de diferentes níveis de necessidade de gesso sobre as características físicas de solos salino-sódicos da região semiárida de Pernambuco. O experimento foi realizado no Laboratório de Mecânica do Solo e Aproveitamento de Resíduos da Universidade Federal Rural de Pernambuco. Os tratamentos foram dispostos em delineamento em blocos casualizados com arranjo fatorial de dois solos (S1 e S2) e cinco níveis da necessidade de gesso (50, 100, 150, 200 e 250%) determinada pelo método de Schoonover M-1, incorporados aos primeiros 12,5 cm da coluna de solo, com cinco repetições. A utilização de níveis crescentes de gesso para a correção de solos salino-sódicos proporcionou maior taxa de infiltração de água nos solos. O nível de 100% da necessidade de gesso promoveu menor grau de dispersão e maior estabilidade de agregados dos solos. No decorrer do experimento pôde-se observar, a partir do nível de 150% da necessidade de gesso, ocorreu perda de coloides (mineral e/ou orgânico). Palavras-chave: sodicidade, estabilidade de agregados, taxa de infiltraçãoPhysical characteristics of saline-sodic soils of semiarid Pernambuco in function of different levels of gypsum ABSTRACT This study aimed to evaluate the efficiency of application of different levels of gypsum requirement on physical characteristics of saline-sodic soils of the region of semiarid of Pernambuco. The study was conducted in the Laboratory of Soil Mechanics and Waste Utilization of the Federal Rural University of Pernambuco. Treatments were arranged in a randomized block design with a factorial arrangement of two soils (S1 and S2) and five levels of gypsum requirement (50, 100, 150, 200 and 250%) determined by the method of Schoonover M-1, incorporated in the first 12.5 cm of the soil column, with five replications. The use of increasing levels of gypsum for the correction of saline-sodic soils provided greater water infiltration rate of the soil. The level of 100% of the gypsum requirement promoted lower degree of dispersion and more stability of soils aggregates. During the experiment it was observed that from the level of 150% of gypsum requirement occurred loss of colloids (mineral and/or organic).

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Recuperação de solos afetados por sais usando água de qualidade inferior

Cited by 4 publications

References 1 publication

Soil solution composition affects microstructure of tropical saline alluvial soils in semi-arid environment

Soil solution composition affects microstructure of tropical saline alluvial soils in semi-arid environment

Seedlings of yellow passion fruit in soils degraded by salts treated with bovine biofertilizer

Características físicas de solos salino-sódicos do semiárido pernambucano em função de diferentes níveis de gesso

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