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This paper discussed the effects of irrigation with well water on the salinity and pH of a weakly alkaline paddy soil in Fujin of Heilongjiang Province in the north-eastern part of China.It has been found that after seven years the accumulation of total soluble salts did not occur and that the pH of 0～15 cm layer fell down from 7.92～8.30 to 6.76～7.45,and that the content of anion HCO - 3 and its proportion in the total soluble anions have fallen down.Conversion from paddy soil to upland restored the pH of soil,exchangeable sodium,ESR(exchangeable sodium ratio) to their original levels of upland fields respectively.
This paper discussed the effects of irrigation with well water on the salinity and pH of a weakly alkaline paddy soil in Fujin of Heilongjiang Province in the north-eastern part of China. It has been found that after seven years the accumulation of total soluble salts did did not occur and that the pH of 0-15 cm layer fell down from 7.92-8.30 to 6.76-7.45, and that the content of anion HCO-3 and its proportion in the total soluble anions have fallen down.Conversion from paddy soil to upland restored the pH of soil, exchangeable sodium, ESR (exchangeable sodium ratio) to their original levels of upland fields respectively.