Trace elements limit potential for blending San Joaquin drainwater with canal water

Abstract

Poor soil-water infiltration in the eastside of the San Joaquin Valley is frequently attributed to low-salinity irrigation water. This report assesses the feasibility of improving infiltration rates by blending the more saline westside drainwater with the less saline Friant-Kern Canal water, a strategy which would also provide a disposal method for westside drain water. However, the study found that boron and molybdenum concentrations in the drainwaters require large blending ratios to prevent crop yield reductions of tree crops grown along the eastside. These large blending ratios mean that the blended irrigation water may have little effect on improving filtration.

Effect of Magnetic Strength of the Water Salinity Treatment Devices on Salt Accumulation in the Root Zoon and Its Impact on Growth and Productivity of Olive Trees

“…The effect of the MTW treatment on the relative water content of the experimental olive trees is shown in Table (7). The values of relative water content in the first season increased in the plants irrigated with MTW than in those of the control (UTW), the mean values were 74 and 81 for the UTW and MTW, respectively.…”

“…Chlorophyll content serves as an indicator of plant health and vigor, playing a crucial role in the growth productivity of plants. Data presented in Table (7) shows the effect of variable magnetic strengths (as found in commercial devices) on leaf chlorophyll content which is measured as an additional indicator of plant health.…”

“…The effect of the MTW treatment on the leaf proline content of the experimental olive trees is shown in Table (7). The data of the first season showed that the proline content of the leaves decreased significantly when olive trees were irrigated with MTW as compared with the control (UTW).…”

“…In addition, saline stress has a significant impact on Photosystem II (PSII) by impeding the disintegration of water molecules to obtain the necessary electrons for photochemistry, which diminishes the maximum quantum yield [3,4]. Some efficient strategies to overcome salinity problems were: 1-leach salts out of the root zone using suitable irrigation management to prevent the accumulation of the salt within the soil profile [5,6], 2-Blending saline water with less-saline water [7,8], 3-Mulching treatment [9,10], 4-Implementing subsurface irrigation systems [11,12], 5-Planting higher salt tolerance cultivars [13][14][15], 6-Application of some saline correctors, such as salicylic acid [16], humic substances tend to regulate soil pH and soil salinity and help to retain organic matter in the surface layer, meanwhile the salt content is leaching out from the surface layer accumulating in the layers below [17], and foliar application by ascorbic acid [18].…”