Campbell-scientific Sentek TriSCAN® Manual v 1.2a Manual de usuario descargar pdf (Pagina 54)

TriSCAN Manual Version 1.2a

Table 12. Crop Tolerance and Yield Potential of Fruit Crops as Influenced by Irrigation Water Salinity (EC

)

and Soil Salinity (EC

) – from Ayars and Westcott 1994

Adapted from Maas and Hoffman (1977) and Maas (1984). These data should only serve as a guide to

relative tolerances among crops. Absolute tolerances vary depending upon climate, soil conditions and

cultural practices. In gypsiferous soils, plants will tolerate about 2 dSm

-1

higher soil salinity (EC

) than

indicated but the water salinity (EC

) will remain the same as shown in this table.

means the average root zone salinity as measured by electrical conductivity of the saturation extract of

the soil, reported in deciSiemens per meter (dSm

-1

) at 25°C. EC

means electrical conductivity of the

irrigation water in deciSiemens per meter (dSm

-1

). The relationship between soil salinity and water salinity

(ECe = 1.5ECw) assumes a 15-20 percent leaching fraction and a 40-30-20-10 percent water use pattern for

the upper to lower quarters of the root zone.

The zero yield potential or maximum EC

indicates the theoretical soil salinity at which crop growth ceases.

Tolerance evaluation is based on tree growth and not on yield.

Yield Potential

100 % 90 % 75 % 50 % 0 %

(maximum)

Fruit crops

Date palm

(Phoenix dactylifera)

4.0 2.7 6.8 4.5 11.0 7.3 18.0 12.0 32.0 21.0

Grapefruit

(Citrus paradisi)

1.8 1.2 2.4 1.6 3.4 2.2 4.9 3.3 8.0 5.4

Orange

(Citrus sinensis)

1.7 1.1 2.3 1.6 3.3 2.2 4.8 3.2 8.0 5.3

Peach

(Prunus persica)

1.7 1.1 2.2 1.5 2.9 1.9 4.1 2.7 6.5 4.3

Apricot

(Prunus armeniaca)

1.6 1.1 2.0 1.3 2.6 1.8 3.7 2.5 5.8 3.8

Grape

(Vitis sp.)

1.5 1.0 2.5 1.7 4.1 2.7 6.7 4.5 12.0 7.9

Almond

(Prunus dulcis)

1.5 1.0 2.0 1.4 2.8 1.9 4.1 2.8 6.8 4.5

Plum, prune

(Prunus domestica)

1.5 1.0 2.1 1.4 2.9 1.9 4.3 2.9 7.1 4.7

Blackberry

(Rubus sp.)

1.5 1.0 2.0 1.3 2.6 1.8 3.8 2.5 6.0 4.0

Boysenberry

(Rubus ursinus)

1.5 1.0 2.0 1.3 2.6 1.8 3.8 2.5 6.0 4.0

Strawberry

(Fragaria sp.)

1.0 0.7 1.3 0.9 1.8 1.2 2.5 1.7 4.0 2.7

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 60 61

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