Farm Table says:
A complete literature presentation of the Study:
The rice (Oryza sativa L.)–wheat (Triticum aestivum L.) cropping system, which covers an area ranging from 9.5 to 13.5 million ha, is a long-established grain production system in China and is considered to be of utmost importance for China’s food security and livelihood. The development of more stable and sustainable agroecosystems for improving food production has caused wide public concern in recent years.
In the present study, we conducted a field experiment to investigate the effect of pig manure organic-inorganic compound fertilizer with reduced chemical fertilizer on the crop yields, soil physicochemical properties, biological activities and bacterial community structure in a rice-wheat cropping system over two crop seasons (rice and wheat).
The results showed that at all sampling times, this fertilizer regime enhanced the soil nutrient availability, microbial biomass, enzymatic activities, and soil nitrogen processes and, to some extent, promoted crop yields.
• bacterial communities were dominated by Proteobacteria, Acidobacteria, and Chloroflexi at the phylum level.
• Hierarchical cluster analysis based on the weighted UniFrac distance revealed that the bacterial community structures were strongly separated by the sampling time and the treatments in the wheat harvest soils.
• A Venn diagram of shared OTUs showed a core microbiome across different treatments and sampling times, in which the relative abundance of each abundant phylum (class) was stable in the different treatments and at different sampling times.
• Specifically, the relative abundance of Alphaproteobacteria, Gammaproteobacteria, Nitrospirae, Bacteroidetes, and Actinobacteria was largely and particularly enriched under the organic-inorganic compound fertilizer regime, indicating that soil functions, such as nitrification and the turnover of organic matter, might be strengthened under this treatment.
Collectively, these results indicate that the application of organic-inorganic compound fertilizer may reduce chemical fertilizer use and improve the long-term productivity and sustainability of agroecosystems.
To the best of our knowledge, this is the first study to comprehensively evaluate the effects of pig manure organic-inorganic compound fertilizer with reduced chemical fertilizer on crop yields, soil edaphic properties, biological attributes (microbial biomass and enzyme activity), biochemical traits (microbial nitrogen functional genes), and the bacterial community structure in a rice-wheat cropping system under the field conditions. The NPKMOI treatment was able to increase crop yields, soil nutrient availability, microbial biomass, enzymatic activity, nitrogen processes, community richness, and diversity. Therefore, the NPKMOI treatment might be a sound fertilization practice for the sustainable food production in the future.