No abstract

This paper is a partial report on the quality of irrigation water. It is principally concerned with the salts of irrigation water which form salines in the soil. A method has been suggested for calculating the potential salinity of water and listed as ‘effective salinity.’ New conversion factors have been listed for changing from milliequivalents to parts per million or pounds of salt per acre foot for the soluble salts of effective salinity. A new standard has been suggested for the total salts of irrigation water based on the effective salinity, followed by a discussion concerning the application of this standard to irrigated agriculture.

Synopsis On a sandy loam soil the flowering and vegetative growth were increased by frequent irrigation. Shedding was also increased but over a considerable range in irrigation frequency total boll set was unaffected.

No abstract

A computer land reclamation model was developed and applied to a field leaching study of moderately salt‐affected profiles. Leaching was accomplished by ponding 15 cm of water intermittently in 3 m by 3 m basins every 1 to 2 weeks. Computer predictions on the degree of reclamation were compared with measured changes in soluble salts, soluble boron, and SAR to soil depths of 274 cm. The differences between computed and measured field data were no more than the horizontal variations found in salt‐affected lands in this area and elsewhere. Also reported are predicted drainage water quality and a method for computing gypsum requirements of sodium‐affected profiles.