Plant Growth Promoting Bacteria (PGPBs) are a strong ally for sustainable agriculture. They offer an interesting alternative to chemical fertilizers and pesticides. Many microorganisms have been widely documented for their PGPR traits, but actinobacterial microbes which have been increasingly documented only these two past decades for their ability to promote plant growth. Their action on plant health and yield could be either direct, indirect or both. This review will cover articles that have been published on Actinobacteria PGP traits, highlighting the involved mechanisms to reveal their strong potential as microbial fertilizers. Possible strategies to encourage Actinobacteria use as bioinoculants are also discussed.

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Our objective is to analyze the behaviour of cereals at the level of soils characterized by different salinity rates, in Oranais and to see the correlation between the nature of the soil and the yield. We studied the regional bioclimate and carried out physicochemical analyzes of the soils of plots sown during the 2016-2017 agricultural campaign in durum wheat (Semito variety) and barley (Saida variety), at three sites. In particular at the CFPA (Professional Training and Learning center) of Misserghin in the Province of Oran, Si Zidane pilot farm in the Province of Sidi Bel Abbes and at the level of INRAA of H'madena in the Province of Relizane. Our study allowed us to identify variability in salinity,with extreme salinity at the level of the sebkha of Oran which is used as the benchmark for the extreme rate of salinity observed. Other physicochemical parameters, different from one site to another, were determined with a view to looking for correlations of other parameters with salinity. The Misserghin site stood out in terms of yields compared to other sites thanks in particular to its low salinity rate which is 1.73ds m-1 and a rainfall of 296 mm with better distribution. Followed by the site of the Si Zidane pilot farm in Sidi Bel Abbes, and then followed by the INRAA site which revealed a low yield, given the aridity with low cumulative precipitation, as well as its situation in a Semi-arid lower than warm winter. Barley adapted best relative to durum at all three sites.

Our study was conducted in the sandy quarry of Terga located at the mouth of Wadi EL Malah in the wilaya of Ain Témouchent (northwest coast of Algeria). This region has a major problem of soil degradation which often leads to the abandonment of large farmland areas and a form of progressive desertification of the environment. To rehabilitate soils and landscapes degraded of this area ,our research is proposed to identify and study the activity of microbial population by comparing the results to the soil environment characterization and found that the soil is very poor of nutrients, organic matter (less than 1%) in the presence of an alkaline (pH greater than 9). These adverse conditions hinder the development of microbial flora essential for growth and plant nutrition soil.

In order to define the impact of a bio-revegetation effect on soil physicochemical properties, we used Acacia Saligna in variants with bio-fertilizers such as rhizobia and mycorrhizae that play a key role in the productivity and sustainability of soil as well as the environmental protection. The area of study is a degraded sandy quarry in Terga, a coastal semi-arid area located in the northwestern part of Algerian. Our sampling and analysis of soil were made after each trimester of experiments in the fields, using four blocks, each one containing ten plots. Sampling is a composite of soil that was made in each plot diagonally on a depth of 10 cm and a diameter of 30 cm from the plant, at different times: first trimester (3 months), second (6 months), and third (9 months). Preliminary results showed a real and favorable modification of substrates by obtaining materials with less alkaline pH, there is a significant phosphorus increase in the second and third trimester compared to the first trimester, however the soil calcareous nature prevents the expression of some parameters resulting in a small improvement in total nitrogen and a deficiency in both exchangeable magnesium and organic matter.