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Effctiveness of improved grass species


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#1 Gandhiv

Gandhiv

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Posted 02 January 2005 - 11:48 AM

Effectiveness of root and foliage system of grasses (Napier, Stylo and Molasses)
By Gandhiv Kafle

A. Napier

Pennisetum purpureum

Rooting depth

14 to 54 centimetres

Root lateral spread

19 to 73 centimetres radial from the clump

Height

95-435 cm

Ground surface area protected by foliage against direct raindrop effect

3960 to 129067 sq. cm

Mean value: 61890 sq. cm

Volume of soil bound by roots

16568 to 897053 cu. Cm

Mean value: 370980 cu cm

Spacing

Plain area: 90 cm

Sloppy area: 75% of 90 cm = 67.5 cm

Quantity of planting material required

For single row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 5, 11, 28, 55, 83 and 111 respectively.

For double row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 9, 21, 55, 109, 165 and 221 respectively.

For triple row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 14, 32, 83, 164, 248 and 332 respectively.

Shading distance

Depends upon the height of grass and position of sun

Taller the grass more is the shade effect.

Max. 433 cm shading distance is found for mean height of Napier - 250 cm, when sun makes 60 degree angle with the vertical on the top of grass.

B. Stylo

Stylosanthes guianensis

Rooting depth

24 to 103 centimetres

Root lateral spread

25 to 115 centimetres radial

Height

Foliage creeping on the ground, so no significant height

Ground surface area protected by foliage against direct raindrop effect

16293 to 112266 sq. cm

Mean value: 51516 sq. cm

Volume of soil bound by roots

15933 to 1412617 cu. Cm

Mean value: 447663 cu cm

Spacing

Plain area: 130 cm

Sloppy area: 75% of 130 cm = 97.5 cm

Quantity of planting material required

For single row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 4, 8, 19, 39, 58 and 77 respectively.

For double row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 7, 15, 37, 77, 115 and 153 respectively.

For triple row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 11, 23, 56, 116, 173 and 230 respectively.

Shade effect

Creeping foliage, so no shade effect

C. Molasses

Melinis minutiflora

Rooting depth

15 to 27 centimetres

Root lateral spread

11 to 30 centimetres radial

Height

45 to 117 cm

Ground surface area protected by foliage against direct raindrop effect

3740 to 33667 sq. cm

Mean value: 21371sq. cm

Volume of soil bound by roots

9530 to 78938 cu. Cm

Mean value: 37322 cu cm

Spacing

Plain area: 45 cm

Sloppy area: 75% of 45 cm = 33.75 cm

Quantity of planting material required

For single row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 11, 22, 55, 111, 166 and 222 respectively.

For double row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 21, 43, 109, 221, 331 and 443 respectively.

For triple row of 5m, 10m, 25m, 50, 75, 100m length, quantity of planting material is 32, 65, 164, 332, 497 and 665 respectively.

Shade effect

Max. 1.5m for mean height 86cm

Citation: Kafle, G. (2004) Evaluation of effectiveness of root and foliage system of grasses used in soil conservation in paundi khola watershed of Lamjung district Nepal. Institute of Forestry, Pokhara, Pokhara Campus, pokhara, Nepal.




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