Changes in root zone salt content and rice yield on saline-sodic soils across a salinity gradient under different irrigation schedules

Document Type

Article

Publication Date

1-1-2013

Abstract

Soil salinization is one of the main limiting factors for rice production on the Songnen Plain. A field experiment consisting of a low, a moderate and a high saline-sodic soil and three irrigation schedules was carried out in 2011 to investigate changes in root zone soil salt content, rice yield and irrigation water use efficiency on saline-sodic soils across a salinity gradient under different irrigation schedules. The irrigation schedules were: (1) Shallow irrigation with 6-time discharge (T1); (2) Shallow irrigation with 3-time discharge (T2); (3) Local traditional irrigation with 2-time discharge (T3). The results showed that no matter under which of the three irrigation schedules, mass reduction in root zone soil salt content increased with the increasing of salinity level. Salts removed through drainage was significantly (p<0.05) greater on the high saline-sodic soil than on the low saline-sodic soil under T1. Whereas no significant (p<0.05) differences in salt removed through discharge on the three saline-sodic soils under T2 or T3 was found. Rice yield was almost 1.7-time higher on the low saline-sodic soil than on the high saline-sodic soil, while almost 1.4-time higher on the low saline-sodic soil than on the moderate saline-sodic soil under all three irrigation schedules. Similarly, irrigation water use efficiency was significantly (p<0.05) higher on the low saline-sodic soil than on the moderate saline-sodic soil, and was significantly (p<0.05) higher on the moderate saline-sodic soil than on the high saline-sodic soil. Overall the study showed there are large differences among the three degree of saline-sodic soils in effects on soil salt content, rice yield and irrigation water use efficiency, and the T1 treatment is a comparatively good management option for reclamation the high saline-sodic soil.

Publication Source (Journal or Book title)

Journal of Food, Agriculture and Environment

First Page

1499

Last Page

1505

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