The presence
of organic acid of low molecular weight in the soil is observed that they
promote plant growth, poor growth occurred in soils in a circumstance where
these compound where absent or less inadequately available.
Water soluble
humic substance from farmyard manure and from rotten leaves has a positive
effect on the growth and development of the plant and on a certain biological
processes-nitrification and the nitrogen assimilation, the effect of these
substances increases as the decomposition of organic matter increased.
The farmyard
manure application increased the germination capacity and also the vitamins
content of the plants; animal given fodder from field such as these shows a
higher resistance to diseases. These phenomena were directly connected with the
presence in the farmyard manure of certain organic compounds of the vitamin
type that are presence.
The nature
of the positive effect of growth promoting substances on the plants result from
their actions colloidal chemical properties of the protoplasm and on the
increased uptake of water and nutrient into the parts of plants enriched with
growth promoting substance. However, the application of substances for
stimulating plant growth is a well recognized part of agricultural practice.
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