First-year biomass production and soil improvement in Leucaena and Robinia stands under different pollarding systems

Youkhana A., . and Idol T., . First-year biomass production and soil improvement in Leucaena and Robinia stands under different pollarding systems. pp. 181-187. ISSN 0128-1283

The study of biomass production and soil improvement of two fast growing and multipurpose trees Leucaena leucocephala and Robinia pseudoacacia was carried out in Mosul Forest northern Iraq to examine the impact of pollarding height (0 15 30 and 45 cm) and frequency (no pollarding pollarding every three or six months) on growth responses and soil properties. These species are being studied as part of a larger research programme to develop novel agroforestry systems in Iraq. Leucaena leucocephala showed the greatest response in terms of branching shoot basal diameter height biomass and nitrogen and phosphorus contents of leaves and stems with pollarding every three months at 15 cm. For R. pseudoacacia pollarding once after six months at 45 cm resulted in the greatest growth response of leaves and stems. Physical soil properties such as bulk density infiltration rate and chemical properties such as pH total soil organic matter and nitrogen available potassium and phosphorus were all improved under L. leucocephala and R. pseudoacacia. Management of these trees in Iraq for soil improvement or in agroforestry systems with different crops such as wheat barley corn and cotton should take into consideration optimal pollarding frequency and height as well as planting density to produce the desired levels of shade soil cover and green manure as well as animal fodder or wood products.

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Abstract

The study of biomass production and soil improvement of two fast growing and multipurpose trees Leucaena leucocephala and Robinia pseudoacacia was carried out in Mosul Forest northern Iraq to examine the impact of pollarding height (0 15 30 and 45 cm) and frequency (no pollarding pollarding every three or six months) on growth responses and soil properties. These species are being studied as part of a larger research programme to develop novel agroforestry systems in Iraq. Leucaena leucocephala showed the greatest response in terms of branching shoot basal diameter height biomass and nitrogen and phosphorus contents of leaves and stems with pollarding every three months at 15 cm. For R. pseudoacacia pollarding once after six months at 45 cm resulted in the greatest growth response of leaves and stems. Physical soil properties such as bulk density infiltration rate and chemical properties such as pH total soil organic matter and nitrogen available potassium and phosphorus were all improved under L. leucocephala and R. pseudoacacia. Management of these trees in Iraq for soil improvement or in agroforestry systems with different crops such as wheat barley corn and cotton should take into consideration optimal pollarding frequency and height as well as planting density to produce the desired levels of shade soil cover and green manure as well as animal fodder or wood products.

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Item Type:	Article
AGROVOC Term:	Biomass
AGROVOC Term:	Soil improvement
AGROVOC Term:	Leucaena leucocephala
AGROVOC Term:	Robinia pseudoacacia
AGROVOC Term:	Pollarding
AGROVOC Term:	Growth form
AGROVOC Term:	Agroforestry
AGROVOC Term:	Branching
AGROVOC Term:	Shoots
AGROVOC Term:	Phosphorus
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21735

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