Abstract:
The present work has the purpose to point out the biostimulator effect
of lignin and ammonium lignosulfonate through their products of biological
transformation on the growing and development of the bean plants (the
Magna breed). Effect which manifests an intensity which depends on the
concentration. But when going beyond a certain level of concentration, both
compounds cause an inhibition of the mitotic division which is reflected in
the more reduced rhythm of growing. The fact that the lignin products can
suffer modifications on the cultivated soil can be emphasised through the
plants analyses obtained on this kuid of soil. The nitrogene one of the
chemical elements with the most complex and important role in the existence
of the living organisms and it cannot be replaced by another nutritive
element. It is, generally, the fourth in plants after carbon, oxygen and
hydrogen. Usually, only 10-20% from nitrogen in the plant can be found as
free ions of NO3- or NH4
+.
The nitrogen is considerated throwgh excellence an element of
growth. The growth in dimenssion or weight of cells and plant
generallycannot is conceived without the biosynthetis of the proteic
substances that cannot take place without the nitrogen. Through the
chlorophil one of the nitrogen's component contributes at the photosynthetic
activity, the base of all the processes in a plant, including the on of the
growth and development. Some of the compounds, because of their specific
role, stimulate the growth of the plants. This way, from the fitohormons, the
auxines intensificate the meristemathic cellular division, stimulate the
absorbtion of the water and the mineral substances; the citokinetines amplity
the multiplication by the division of the mature nonmeristhematic cells. The
nucleoproteides, which can be found in the nucleus but also in the citoplasma
and ribosoms have an important role in the cellular division and in the
synthetis of the proteids needed both in the growth processes, and the
differentiating processes from new tissues and organs. The depletion of the
nitrogen leads to the inhibation of the chlorophile synthesis, growth hormons,
nucleoproteids, proteins and, eventually, the plant's growth.
