عنوان مقاله [English]
Limitation of suitable water resources is a major problem of agriculture in Iran. Increase in irrigation interval caused cracks in the intermittent irrigation in paddy fields. To evaluate the effect of shallow water table on humidity conditions and physical properties of paddy soils, soil texture factors at three regions (Moasese (Rasht), Shanderman and Astaneh) and a factor shallow water table at three levels (zero, 7.5 and 15cm) and in three replicates as the factorial based on complete randomized blocks design in Rice Research Institute. The amount of moisture, crack width, soil’s resistance to penetrometer, soil column height, yield and yield components of rice were measured Results showed that the effect of shallow water table levels on soil column height, cracks width, moisture content and resistance to pentrometer penetration has been significant at one percent statistical level. All three soil texture, moisture content in the water table level 15 cm below field capacity moisture content. Resistance to pentrometer penetration at water table 15 cm for the Moasese and Shanderman, respectively reached to 52.29 and 11.44 kPa. The maximum width of the crack in the water table 15cm is between 1.2- 1.5 cm. At water table 7.5cm only been seen capillary crack. Also effect of water table on yield and yield components of rice was not significant. Can be expressed in the shallow water table management in the scale of pot can be effective in preventing leaks and cracks.