The biostimulator effect of lignin and ammonium lignosulfonate on the growing and development of plants

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.