Salt regime of soils in rice crop
DOI:
https://doi.org/10.31073/acss88-07Keywords:
dark chestnut soil; meadow chestnut soil; rice; rice irrigation system; salt soil balance; solonetz meadowAbstract
Investigation`s goal was soil salt regime definition of the main soil types of rice irrigation systems in active rice growing practice conditions. Salt soil regime was investigated on the 8 fields of Institute of rice NAAS. Investigation duration was 10 years. Dark chestnut, meadow chestnut and solonetz meadow soil types were researched. Process of soil desalinization is pulse type in rice irrigation systems conditions. Rice growing causes decrease of soil salt content, in average, to 20,8-25,5 % for dark chestnut soil, to 8,0-13,2 % for solonetz meadow soil, and to 11,1-51,5 % for meadow chestnut soil. There are changes in the composition of hypothetical salts of all investigated soils types; in particular, in the dark chestnut saline soil and solonetz meadow soil there was a replacement of soda (NaHCO3) with magnesium bicarbonate (Mg(HCO3)2). In the dark chestnut soil and meadow chestnut saline soil, the mobility of the sodium chloride system - magnesium sulfate was noted. Investigations illustrated desalinization of rice irrigation systems` soil, in project work conditions and rice content not more than 50 %. Soil desalinization to 11,7 % for dark chestnut soil, to 30,7 % for meadow chestnut soil, and to 29,2 % for solonetz meadow soil was fixed
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