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V. Chloride Management in Fertilization and Irrigation And irrigation

V. Chloride Management in Fertilization and Irrigation And irrigation

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underground water table, the draining water may create a continuous wet zone with

the groundwater level In that case, the upward flow of capillary water leads to

salinization of the soil surface as a result of water evaporation with chloride precipitation on the soil surface.

In drip irrigation, the salt distribution pattern depends on the rate of evaporation

from the soil surface (Yaron et al., 1973), the water uptake by the plant, the location of the wetting front, the total amount of applied irrigation water, and the distance between drip lines. As the amount of applied water increases, more salts are

leached below the drip line and there is a larger salt accumulation on the soil surface between the irrigation lines.

Chloride concentration in the soil solution increases as more water is taken up

by the plant and the soil moisture level approaches the permanent wilting point.

Plants can tolerate water with a high salt concentration when the soil moisture level is high (Rhoades, 1993) and when the high salt concentration zone is located in

deeper soil layers with lower root density. Therefore, classifications of water quality should also consider the effects of irrigation practices and plant root distribution.


The correct management of irrigation requires periodic monitoring of the concentration of the soil solution in the root zone. The salt concentration must remain

below a given threshold value, according to the sensitivity of the crop to salinity

and particularly to chloride (see Table V).

The methods used for monitoring soil salinity were reviewed by Rhoades and

Oster (1986). The total concentration of soluble salts in the soil solution is generally estimated by determining the EC of the saturated paste extract or by sampling

the soil solution. In most cases, chloride is the main anion present in the soil solution. The chloride concentration can be determined directly in the saturated soil extract or in the soil solution extracted with suction cups or with gypsum block sensors. Chloride testing methods have been reviewed by Johnson and Fixen (1990).

The reliability of the results is influenced by the soil variability, the position of

the soil solution suction cups relative to the pattern of water and salt accumulation

in the soil profile, and sensors type (Rhoades and Miyamoto, 1990). The number

of samples and their spatial distribution will affect the reliability of the field salinity level determination.



With the increasing use of saline and recycled sewage water for agriculture, fertilizer application under saline conditions has become a subject of considerable in-



terest (Feigin, 1985). Sodium chloride salinity disrupts mineral nutrition acquisition by plants in two ways (Grattan and Grieve, 1992): (1) total ionic strength of

the soil solution, regardless of its composition, can reduce nutrient uptake and

translocation; and (2) uptake competition with Naϩ and Cl ions can reduce nutrient availability. These interactions may lead to Naϩ-induced Ca2ϩ and/or Kϩ

deficiencies (Volkmar et al., 1998) and Cl-induced inhibition of nitrate uptake

(Kafkafi et al., 1982). It was postulated that the salinity tolerance of crops can be

improved by the suitable use of nutrients (Kafkafi, 1987).

Most of the reported studies on NaCl salinity effects do not separate the effects of

Naϩ from those of Cl (Volkmar et al., 1998). A low concentration of Cl salts is beneficial (Fixen et al., 1986). In the wet volume of irrigated soils used to grow regular

field crops such as tomatoes and melons, EC values of about 3.0 dS/m in the soil solution, with chloride salts as the dominant component, are common (Kafkafi et al.,

1992). Chloride concentrations above about 10 mmol/liter in the irrigation water

are generally considered problematic for plant growth (Ayers and Westcott, 1985).

Salinization with NaCl or KCl inhibits the net uptake of nitrate in citrus (Cerezo et

al., 1997) and causes nitrogen deficiency (Embleton et al., 1978). Nitrate competes

with chloride for uptake by the plant, as discussed in Section IIIE; therefore, when

the irrigation water contains nitrate at about 8–16 mmol/liter, even sensitive plants

like avocado can survive at chloride concentrations of 8–16 mmol/liter (Fig. 3).

High potassium fertilization might enhance the capacity for osmotic adjustment

of plants growing in saline habitats (Cerda et al., 1995), as potassium is the most

abundant cation in the cytoplasm of glycophytes (Marschner, 1986). In spinach,

higher Kϩ requirements are needed for shoot growth under high salinity than under low salinity conditions (Chow et al., 1990). Differences in salt tolerance among

maize varieties appear to be related to higher Kϩ fluxes and cytoplasmic concentrations on the one hand and lower Naϩ and Cl fluxes an cytoplasmic concentrations on the other (Hajibagheri et al., 1989). Potassium uptake is greater in the high

salt-tolerant group of barley cultivars than in salt-sensitive ones (Sopandie et al.,

1993). However, an external Kϩ supply is not required for root growth of castor

bean (Ricinus communis L.) under saline conditions ( Jeschke and Wolf, 1988). Increasing the Kϩ supply in the rooting media of maize did not alleviate the growth

reduction imposed by treatment with NaCl at 50 mmol/liter (Cerda et al., 1995).

Tip-burn symptoms in Chinese cabbage, induced by salinity with NaCl and CaCl2,

was not alleviated by the addition of KNO3 (Feigin et al., 1991).

The addition of adequate P can also be helpful in alleviating salt stress (Champagnol, 1979; Awad et al., 1990). A positive effect on P on the yield of foxtail millet and clover grown in a saline soil was reported (Ravikovitch and Yoles, 1971).

As crops can differ greatly in their response to nutrition management under different combinations of environmental salinity (Feigin et al., 1991), specific information on the behavior of crops under different situations of Cl salinity is needed for

the optimal fertilization management of specific crops.





The use of water containing chloride must be accompanied by appropriate practices to keep Cl levels in the soil within the limits of crop tolerance. The amount

of supplementary Cl salt added to the soil depends on the salt concentration in the

water, the evaporation level and the amount of irrigation water (which depends on

the physiological development of the plant). With 500 mm of irrigation water containing Cl at 100 –200 mg/liter (low to medium level of salinity, see Table I), the

applied Cl reaches 500 –1000 kg/ha. This amount of Cl is equivalent to KCl fertilization of 1000 –2000 kg/ha. In field practice, the recommended range of KCl

fertilization is 75–150 kg/ha for field crops and 300–500 kg/ha for horticultural

crops. This suggests that the addition of Cl in KCl fertilizer is relatively safe for

most agricultural crops, especially when the rainfall during the rainy season is capable of leaching the excess Cl accumulated during fertilization and irrigation.

Irrigation with saline water is managed by an excess of irrigation to meet the

leaching requirement for avoiding salt accumulation in the crop root zone

(Richards, 1954). When plants are present, however, there is a risk that the advantages gained from salt leaching may be lost with the onset of temporary oxygen shortage due to water-logging (Stevens and Harvey, 1995). The ability of

grapevine roots to exclude sodium and chloride from the leaf was strongly reduced

by a short period of waterlogging (West and Taylor, 1984; Stevens and Harvey,

1995). In a river land of southern Australia, the EC of irrigation water during the

period 1985–1990 was less than 0.5 dS/m; however, grapevines suffered salinity

damage because of excessive irrigation. The excess water drained to an aquitard

just below the root zone and formed a temporary water table that mobilized the

previously leached salts back into the root zone as a result of the capillary rise of

the water (Stevens and Harvey, 1995).

The irrigation system influences the distribution of salt in the soil’s profile and

surface. Keller and Bliesner (1990) presented a detailed calculation of the efficiency of chloride leaching by different irrigation methods. In drip irrigation, the

water is applied at short intervals so that the application of minimum leaching doses and the relatively small change in the soil’s water content keep the salinity of

the soil close to that of the irrigation water. In drip irrigation the leaching dose

(LRt) required to wash salts out of the root zone is defined as the ratio between the

water height applied for leaching and the irrigation water height applied for satisfying crop and leaching demands. The equation is simply expressed as: LRt ϭ

ECw /2ECemx, where ECw is the EC of the irrigation water and ECemx is the maximum EC value of the saturated soil extract at which the crop can survive.

In sprinkler or surface irrigation the water is applied at longer intervals, during

which the salt concentration of the soil solution gradually increases. Before the

next irrigation, salt concentrations on the soil surface reach relatively high values.



The equation for calculating the leaching requirement dose is: LRt ϭ ECw /(5ECe

Ϫ ECw), where ECe is the mean EC of the saturated soil extract at which no yield

reduction occurs (Keller and Bliesner, 1990).



Chloride can be absorbed directly by crop leaves and can cause foliar injury

when its concentration in the sprinkler water is high (Maas et al., 1982). Leaf

scorching due to excessive Cl accumulation in the leaves varies among different

species and depends on leaf properties and on the rate of Cl absorption by the

leaves. Temperature, relative humidity, and water stress all have marked effects on

the leaf injury. Absorption of Cl continues as long as the leaf is wet. Evaporation

from the leaf surface increases the salt concentration on the leaf and consequently also the leaf scorching level.

Deciduous trees, such as almond, apricot, and plum, absorb Naϩ and Cl readily through the leaves, and partial leaf abscission occurs after a 50-hr sprinkler irrigation with water containing CaCl2 or NaCl at a concentration of 10 mmol/liter

(Ehlig and Bernstein, 1959). The crop leaf Cl concentrations causing leaf injury in

plum, almond, and orange are 4.3–7.1, 6.4–10.6, and 7.1–10.6 mg/g DM, respectively. No visual foliar injury was observed in grapes sprinkled with water

containing Cl at 5 or 10 mmol/liter (Francois and Clark, 1979). In avocado, where

the thick waxy layer of the leaves limits the absorption of ions present in the sprinkling water, chloride accumulation in the leaves is very low and no visual injuries

are observed (Ehlig and Bernstein, 1959). Therefore, although avocado is known

to be sensitive to salt concentration in the growing medium, there is no risk of direct foliar absorption of chloride because of the leaf surface characteristics. Chloride accumulation in crop leaves depends mainly on the time of watering (Francois and Clark, 1979). Therefore, rootstocks known to limit chloride absorption by

the roots are not suitable when sprinkler irrigation is used and they do not avoid

chloride accumulation in the leaves.

Field and vegetable crops are not especially sensitive to salt accumulation in the

leaves (Ehlig and Bernstein, 1959). Strawberry is highly sensitive to chloride in

the soil solution, but is less affected by salt absorption through leaves (Ehlig,

1961). The rate of foliar absorption of chloride increases in the following order:

sorghum ϽϽcotton, sunflowerϽcauliflowerϽsesame, alfalfa, sugar beetϽbarley,

tomatoϽpotato, safflower (Maas et al., 1982). However, this order does not apply

to foliar injury. The relative values of crop sensitivity to foliar injury due to chloride in the sprinkling water are summarized in Table VIII. Because both crop and

environmental conditions influence the injury level, these data constitute only a

guideline to irrigation during daytime hours.



Table VIII

Crop Sensitivity to Foliar Injury due to Chloride

in Sprinkler Irrigation Watera

Cl concentration







Crops exhibiting foliar injury

Almond, apricot, citrus, plum

Grape, pepper, potato, tomato

Alfalfa, barley, corn, cucumber, safflower,

sesame, sorghum

Cauliflower, cotton, sugar beet, sunflower

on Maas et al. (1982).

Sprinkler irrigation of crops that are less sensitive to chloride is possible provided that steps are taken to avoid or minimize foliar injuries. Such measures might

include the use of mobile sprinklers, uniform water distribution, night irrigation,

and the scheduling of longer intervals between irrigations (Maas, 1985).


Chloride anions are hardly sorbed to soil particles and are easily leached in soil

profiles. In acid soils containing variable-charge clays, a slight specific sorption of

chloride is observed.

The crop response to Cl varies among genera, species, and cultivars. The lowest critical Cl concentration for plants below which response to Cl addition is observed ranges between 0.1 and 6 mg/g DM or between about 0.03 and 17 mmol/

liter of chloride on the basis of the plant tissue water content. The normally nontoxic Cl concentrations in plants range from 1 to 20 mg/g. The Cl concentration

in the plant depends in part on the concentration of Cl in the external solution and

its ratio to other anions, particularly nitrate. Chloride compartmentation appears

to be highly regulated. In the chloroplast, the Cl concentration remains relatively

constant regardless of whether Cl in the soil solution is deficient or excessive.

Chloride is required for photosynthesis, charge compensation, and osmoregulation of the whole plant, as well on a single cell basis as in stomatal guard cells.

Palms and coconuts use Cl for charge balance in the guard cells. Relatively large

amounts of Cl are essential for some crops, such as kiwifruit and sugar beet.

Diagnosis of salt toxicity in plants must distinguish between the effects of chloride and those of the accompanying sodium cation. The overall tolerance to high



concentrations of external chloride is due to the ability of the plant to limit Cl uptake by the roots and its transport to the shoots. Accumulation of Cl in the leaves

depends both on its rate of uptake and translocation from the roots to the leaves.

In most crops, the accumulation of chloride in the leaves is controlled by the rootstock. Chloride-sensitive cultivars accumulate an excessive amount of Cl in the

shoots and tolerant cultivars restrict Cl transport to the shoots by a mechanism that

resides in the root. The level of accumulated Cl in the plant should not be regarded as the sole criterion of crop tolerance to chloride.

Ammonium stimulates Cl accumulation in plants. Nitrate can prevent Cl toxicity

at a concentration of up to 16 mmol Cl/liter in the soil solution. A model for the regulation of Cl influx suggests that both negative feedback effects from vacuolar



3 /Cl) or total anion concentrations and external NO3 inhibition of Cl influx at

the plasmalemma may be operating. These combined effects serve to discriminate

against Cl accumulation, favoring NOϪ

3 uptake and its subsequent metabolism. The

uptake interaction between chloride and phosphorus appears to be complex. Phosphate uptake is stimulated when chloride concentrations in the external solution are

low and suppressed when they are high. High levels of NaCl reduce Ca2ϩ and Kϩ

in the roots and leaves. The interaction of chloride with other plant nutrients needs

further study.

The mechanisms of the effects of Cl on foliar disease infection are not well understood. The possibility that both climatic and biological factors may interact with

the plant response to Cl makes it difficult to interpret plant and soil diagnostic data,

except in cases of extreme Cl deficiency in the soil.

Irrigation water containing Cl at less than 150 mg/liter, with ECs in the range

of 1–3 dS/m, can be used for most crops, provided that management practices are

taken into consideration. The main fertilizers containing chloride are potassium

chloride and ammonium chloride. When the annual application rates of these fertilizers supply less than 140 kg Cl/ha, no negative effects on crop growth or yield

are expected.


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