Abstract
Rhizobacteria-containing biofertilizers are perfect tools to promote plant growth for the superiority of reducing environmental damages. Two strains of Chlorobium limicola and Rhodopseudomonas palustris were applied in the experiment as potential inoculants for cucumber seedlings. Significant enhancement in the availability of macronutrient elements N, P and K were observed in soils, and further improvement in their uptake was also obtained in cucumber plants. Accumulation of essential micronutrients Fe and Zn were detected both in the roots and shoots. The two strains increased chlorophyll and carotinoid synthesis, plant height, stem diameter, wet weight and dry weight. Various doses had significant effects on plant growth stimulation, C. Limicola with 107 cells mL-1 and R. Palustris with 108 cells mL-1 seem to be better on the whole.
Highlights
Utilization of fertilizers is really necessary for plant growth, but excessive and repeated use of chemical fertilizers may spoil the soil, water and even atmosphere
A relatively broad utilization could be achieved by non-symbiotic nitrogen fixing bacteria, various free-living microorganisms which are capable of nitrogen fixation, which may be related to the closeness of the root-microorganism association in that living plant roots release a wide variety of simple organic compounds which may be used as food by free-living soil bacteria [2]
Palustris stimulated the availability of the macronutrient element N, P and K in soils, and make further improvement on the uptake of them in cucumber plants
Summary
Utilization of fertilizers is really necessary for plant growth, but excessive and repeated use of chemical fertilizers may spoil the soil, water and even atmosphere. We checked the role of the two strains in macronutrient and micronutrient elements uptake and growth promotion of cucumber. Chlorobium limicola and Rhodopseudomonas palustris are two newly isolated strains from soil.
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