In 1997, increases ranged from 253 percent with ice irrigation to 407 percent with ice irrigation plus dung, and 707 percent with ice irrigation and fertilizer.
Samples were excellent to good type for irrigation based on percent sodium (viz., 1.19 ≥ % Na ≤ 35.28) and SAR (viz., 0.05 ≥ SAR ≤ 0.55).
The GRACE region of sharp groundwater depletion coincides with the world's most intensely irrigated land: Fifty percent to more than 75% of the land is equipped for irrigation with pumped groundwater or reservoir water.
Percent seed set under normal water irrigation.
The groundwater for irrigation purposes by correlating percent sodium (i.e., sodium in irrigation waters) and electrical conductivity.
Wilcox (1955) classified groundwater for irrigation purposes by correlating percent sodium and EC, which suggests that 60%% of the total of 30 samples fall under excellent to good limit and 30%% fall under good to permissible limit (Fig. 6).
The suitability of groundwater for irrigation was studied by calculating percent sodium, sodium absorption ratio and residual sodium carbonate values.
The mean PSST values of DN422, KY131 and the RIL population in the 3 years were 0.59, 0.92 and 0.76, respectively, and their mean percent seed set values under normal water irrigation (PSSN) were 0.90, 0.97 and 0.89, respectively.
The sodium in irrigation waters is usually denoted as percent sodium or sodium percentage.
The sodium in irrigation waters is also expressed as percent sodium or soluble sodium percentage (Na %) and can be determined using the equation in Table 6, where all ionic concentrations are expressed in milliequivalents per liter.
Figures of excessive water use in the region of 25 30 percent have been given and this concerns essentially traditional irrigation systems.
