1
Biologists summarize 520 studies and report the best way to fertilize soil

Biologists summarize 520 studies and report the best way to fertilize soil

A team of biologists from RUDN University working together with foreign colleagues have summarized the results of 520 studies on the impact of manure on the soil and created a snapshot of all biochemical processes that go on in fertilized soils. The team also compared the effect of manure with and without mineral additives, showed how manure from different animals affects the fertility of the soil, and calculated the optimal amount of manure for soil fertilization.

Manure has been used as a source of nutrients for plants since ancient times. However, until recently, no large-scale systematic analysis of this organic fertilizer has been conducted. A team of biologists (including several specialists from RUDN Unversity) reviewed over 500 prominent scientific works on the effect of manure on the quality of soils and have provided systematically and statistically generalized data about manure fertilization.

“Despite the abundance of individual works, no generalized analysis of the effect of manure on different soil properties has been carried out yet. We analyzed 521 works that covered both single-time and continuous use of manure in short- and long-term (up to 113 years) field experiments. Our team also developed a concept of changes in biological processes under the influence of manure depending on climate factors and soil properties,” said Evgeniya Blagodatskaya, a Ph.D. in biology and a senior researcher at the Center for Mathematical Modeling and Design of Sustainable Ecosystems at RUDN University.

When choosing the studies for their meta-analytical work, the team followed strict criteria. Each study had to contain accurate information about the source of the fertilizer and enzymes associated with carbon and nutrient cycles, have an unfertilized control lot, and provide different data and characteristics for statistical analysis. The meta-analysis covered different types of soils and climate zones with an average annual temperature from 10 to 20 degrees C and precipitation from 250 to 1,000 mm.

Having summarized the studies, the team suggested an optimal annual amount of manure for fertilization—25,000 kg per 1 ha. This ratio provides the best balance of yield and soil fertility and helps maintain soil acidity on the level that is the most beneficial for agriculture. However, this value cannot be considered a universal norm: Even though it has been calculated for different climate conditions and soil types, further studies will require a larger database. According to the team, manure is capable of accelerating the biochemical cycles of carbon and nitrogen by up to 30%. Notably, pig manure has a strong influence on the biochemical properties of the nitrogen cycle. After soil is fertilized with manure (especially if it is free from mineral additives), the enzymes that play a role in chemical transformations of carbon, nitrogen, sulfur, and phosphorus compounds become more active. Moreover, manure increases soil porosity and therefore increases its ability to retain water.

Besides the advantages of organic fertilizers, the team pointed out two risk factors that may occur if manure is not handled properly: pathogens and environmental pollution with greenhouse gases and nitrogen and phosphorus compounds. As a part of a well-designed strategy, manure fertilizers can solve many issues confronting the agricultural industry: reducing soil degradation and improving fertility, increasing carbon reserves, accelerating the cycles of key elements and making them available to plants.

The results of the study were published in Science of The Total Environment.

Visiting Professors View all
03 Nov 2017
Michele Pagano is a graduate of the University of Pisa, a leading scientist, the author of more than 200 publications in international journals, and a participant in many international research projects
2107
International scientific cooperation View all
03 Nov 2017
The main goal of the RUDN University and UNISDR Office for Northeast Asia and Global Education and Training Institute for Disaster Risk Reduction at Incheon (UNISDR ONEA-GETI) cooperation is to obtain knowledge about disaster risk reduction and international experience in this area for creating training courses for basic and additional professional education in RUDN
1178
Similar newsletter View all
21 Oct
RUDN University mathematician determined the conditions for the coexistence of three species in the wild

RUDN University mathematician together with colleagues from India and France for the first time studied in detail the system of coexistence of three species of living creatures in the wild. The results help to understand what parameters determine the extinction andли survivalof species, and how the number of species changes in space and time.

27
21 Oct
RUDN University Chemist Created Coordination Polymers Films with up to 99.99% antibacterial efficiency

RUDN University chemist with his colleagues from Portugal has developed two types of coating based on new coordination polymers with silver. Both compounds were successfully tested against four common pathogens.

24
21 Oct
RUDN scientists have improved titanium dental implants with graphene nanosloyers

RUDN researchers have created and tested a method for processing titanium dental implants. It turned out that theanoslos of graphene on the surface of titanium improve its interaction with stem cells,which are placed on the implant so that it better "takes root".Thanks to this method ofprocessing, stem cells are better kept on the surface, multiply and turn into the desired cells.

26
Similar newsletter View all