求翻译：从20世纪50年代开始，甘肃省的农业科技工作者就开始通过生物改良、化学改良和水利工程等措施对盐渍土进行改良与利用 。是什么意思？

Beginning in the 1950s, agricultural scientists in Gansu Province on the biological improvement, chemical modification, and water conservancy and other measures on saline soil improvement and utilization.

From the 20th century, China's Gansu Province began 50 years of agricultural science and technology workers began to improve, through biological and chemical enhancement measures such as water salinity on the improvement and use.

Starts from the 20th century 50's, Gansu Province's agriculture scientific and technical worker starts through measures and so on biological improvement, chemistry improvement and hydraulic engineering carries on the improvement and the use to the pickling earth.

In the 1950 of the 20th century, the agricultural scientific and technological workers started in Gansu province through the improvement of biological, chemical and hydraulic engineering measures, such as improved on improvement and utilization of saline soil.

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