Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6363423 | Agricultural Water Management | 2016 | 7 Pages |
Abstract
Supplementary irrigation is widespread in the Humid Pampa of Argentine, where the main source of water for irrigation has elevated content of sodium bicarbonate. The combination of irrigation and rain increases the sodium absorption ratio of soil (SARs), consequently raising the clay dispersion and reducing infiltration. The water quality standards for irrigation indicate that SARs values ââshould remain below 3.5. An alternative to mitigate these disadvantages is the application of a gypsum amendment. This study targeted the following objectives: measure the impact of tillage and the addition of gypsum on: infiltration, bulk density, sodium content and crop yield in a soil (Argiudoll and petrocalcic Paleudoll association) under no-till with supplementary irrigation. One treatment consisted of applying a gypsum liming of particle size less than 3Â mm. After application, the plots were tilled to a depth of 15Â cm. Sunflower (Helianthus annuus L.) was seeded 30Â days after the completion of the amendment. Applying gypsum improved water infiltration into the soil. Tillage treatment without adding gypsum reduced SARs and increased infiltration the same way as tillage and gypsum treatment. This can be attributed the dissolution of native or precipitated carbonate by irrigation water. Tilled treatments, with or without amendment, had higher yield compared to no-till treatment.
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Authors
José Luis Costa, Virginia Carolina Aparicio, Leonardo Fabian Sallesses, Franco Daniel Frolla,