| In order to open up and utilize the saline-alkali lands and to select new salt resistant wheat varieties, two varieties Naiyan 3 and Naiyan 8 were planted on different saline-alkali lands in the irrigated areas along Yellow River in Baiyin city in Gansu province, Ninchun 18 and 764 as contrast varieties. The results showed that Naiyan 3 and Naiyan 8 had stronger salt resistance and higher yield than the contrast varieties when they were planted on saline-alkali lands with a salinity of 0.299%0.786%. When the soil salinity was 0.299%, the agronomic characters of wheat were affected to a light degree, and the yield of salt-resistant varieties was slightly higher than that of the contrasts. When the soil salinity was between 0.299%0.786%, the growth of wheat was restrained obviously. As the soil salinity increasing, the production increase rate of salt-resistant varieties was higher than that of the contrasts and their superiority was obvious. When the soil salinity was between 0.786%0.828%, the growth of wheat was restrained seriously. As the soil salinity increasing, the yield of wheat dropped rapidly, and the salt-resistant varieties were superior to the contrasts. But their yield was very low so that they were not suitable for planting. |