The growth of legume plants is usually improved by the rhizobacteria inoculation under low phosphorus (P) and alleviation of P nutrition plays important role in plant drought stress response. The aim of this study was to assess the comparative efficacy of two plant growth promoting rhizobacteria namely Burkholderia cepacia B36 and Enterobacter radicincitans D5/23T combined with two sources of phosphates in soybean (Glycine max L.) under low water supply. Plants were grown under P soluble versus insoluble P fertilization for comparing the effects of soybean inoculation on growth, uptake and use efficiency of phosphorus under moderate drought stress. At the beginning of flowering, half of plants was subjected to low water supply (35% water holding capacity, WHC) for 12 days while control plants were well watered - 70% WHC. The plants were harvested at the end of drought and physiological traits and P contents were analyzed. The inoculation treatments showed better plant growth and nutrient uptake when compared to uninoculated control. The application of the Burkholderia cepacia was more efficiently in terms plant growth than E. radicincitans especially under insoluble phosphates. Phosphorus concentrations of shoots and roots increased with both bacterial strains. The bacterial inoculation has much better stimulatory effect on nutrient uptake by soybean fertilized with insoluble phosphates. Study findings indicate that the combined application of PGPR (Burkholderia cepacia B36) and P amendments has the potential to improve P nutrition and growth of soybean cultivated on P-deficient soil under well-watered as well as moderate drought condition.
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In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 3, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
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The purpose of the paper is to reveal the development of plants grown both traditionally and environmentally friendly and to achieve a comparison of advantages and disadvantages of the two systems of agriculture. An essential aspect on which there is an emphasis with a view to the practical application of the organic farming system is the soil fertilization, given the fact that most of the problems that have made the necessity to convert to this type of agriculture are a consequence of soil damage and affecting its quality. The researches have been performed on five species of plants grown in two systems of agriculture. The results obtained have a high theoretical and practical importance and reveal the importance of the organic farming within the framework of the activities of the environmental protection, even if the level of productivity is further reduced.
The issue of residual pesticides in food is of great importance worldwide today. This situation has led many countries to draw up rules with limited quantities allowed in food. Their very high toxicity causes acute intoxications, accumulation in the body and chronic poisoning. Pesticides are highly dangerous compounds due to the persistence in the environment, accumulation of residues in food, infiltration into soil, transmission into wastewater, rivers and lakes, migration into deep soil layers, interstitial and groundwater, and atmospheric formation by air currents. Uncontrolled accumulation and migration into soil and groundwater of pesticides can lead to significant distortions in environmental factor parameters. The purpose of the work was to quantify the results by applying a neonicotinoid pesticide treatment on onion cultivation throughout the life cycle. The work demonstrates the need, but also the toxicity of pest control substances.
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