The neem tree generally grows rapidly under favourable conditions. The pH value and the waster table in the soil, rainfall, irrigation, nutrients, inter and intraspecific competition, mycorhiza, temperature and genetic factors all play a role. Little is knowna about the impact of the last, but environmental influences seems to play an important role in many regions of the tree's distribution range.
In very dry areas, in high altitudes at colder temperaturesand in high rainfall areas, the growth may be happened to secure extent . For instance, as already started, an attempt to grow neem in the western part of the Amazonian basin in Eastern Ecuador failed due to high humanity and precipication. In Vili Levir, neem grows well in the dry and warm western parts whereas only a few trees, with low yields exists in the welter and cooler eastern parts. At high altitudes, relatievely low temperatures may be the main reason fine growth and lower yield. Low rainfall may be another reason for slow growth. Apporximately 130m annual rainfall enables A. Indica to survive but its growth is then very slow. Drought may even lead to details of tree in plantations already 3 - 5 years after planting, due to intraspecific competitions for water, especially if spacing between trees is less than 3m. Much faster growth occurs with 8 - 1.2 grew to a height of 6 -7 m within 2 1/2 years in an area with low rain fall and on soil with high salinity. The leaves of these trees were dark green and locked very healthy.
In very dry areas, in high altitudes at colder temperaturesand in high rainfall areas, the growth may be happened to secure extent . For instance, as already started, an attempt to grow neem in the western part of the Amazonian basin in Eastern Ecuador failed due to high humanity and precipication. In Vili Levir, neem grows well in the dry and warm western parts whereas only a few trees, with low yields exists in the welter and cooler eastern parts. At high altitudes, relatievely low temperatures may be the main reason fine growth and lower yield. Low rainfall may be another reason for slow growth. Apporximately 130m annual rainfall enables A. Indica to survive but its growth is then very slow. Drought may even lead to details of tree in plantations already 3 - 5 years after planting, due to intraspecific competitions for water, especially if spacing between trees is less than 3m. Much faster growth occurs with 8 - 1.2 grew to a height of 6 -7 m within 2 1/2 years in an area with low rain fall and on soil with high salinity. The leaves of these trees were dark green and locked very healthy.
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