How Important is the Quality of Organic Amendments in Relation to Mineral N Availability in Soils?

Abstract

Summary Wastes generated from municipal and agricultural activities have the tremendous potential for application in agriculture as a source of nutrients and as amendments to improve soil organic matter (SOM). A decline in SOM can represent a serious threat to soil fertility and quality. Nitrogen (N) mineralization from organic amendments is important for understanding the N dynamics in terrestrial ecosystems. In this review, quality of the amendments such as C/N ration, N content, and biochemical compositions, etc. are discussed. Since, C/N ratio cannot explain all differences in N mineralization; emphasis has been laid on characterizing different compounds in organic amendments that govern the mineralization process. The importance of simulation models has also been described in modeling N mineralization from some complex materials like compost, animal manures and farmyard manures. These complex simulation models once modified according to the quality of the organic amendments can simulate N mineralization and thus, they can be used for simulating N dynamics in terrestrial eco-systems.

Soil Properties for Predicting Soil Mineral Nitrogen Dynamics Throughout a Wheat Growing Cycle in Calcareous Soils

“…Increasing SOM by adding carbon is a beneficial agronomic practice that stimulates microbial communities and enhances soil N and C pools [31]. The youngest compounds are the most biologically active compounds, and the materials with intermediate ages contribute to soil physical characteristics [28]. We found positive correlations from GS37 to post-harvest with the N min values ( Table 3).…”

“…Nitrate production is mediated via two groups of autotrophic bacteria (Nitrosomonas and Nitrobacter) that convert ammonium into nitrate by the process called nitrification. Nitrogen availability relies on both the initial availability of N min and the rate of mineralization or immobilization [28], as well as the previous N uptake by the crop, influencing the yield and GPC.…”

Spatial patterns of benthic bacterial communities in a large lake

“…We found these factors to significantly affect the microbial communities in Poyang Lake. Previous studies suggested that microbes use organic carbon as their main energy source while N is assimilated and metabolized during microbial growth as well as during the decomposition of the organic matter in the process of GHG production (Mohanty et al, ). Lin et al () have found that NH 4 + in water and in sediment could influence microbial processes at the sediment–water interface.…”

Effect of Litter Quality and Dosage to Potential Nitrification in Soil and Yield of Sweet Corn

“…Kandungan bahan organik pada tanah vertisol pada umumnya rendah, yaitu berkisar 0,06 sampai 4,46% (Prasetyo, 2007), sedangkan C organik pada tanah vertisol ini tinggi, yaitu 3,9 % (Balittanah, 2005). Hal ini diduga karena adanya penambahan bahan organik pada saat pengolahan tanah sebelumnya, sehingga menyebabkan kandungan bahan organik pada tanah ini juga meningkat (Mohanty et al, 2013). Kandungan P dan K pada tanah vertisol ini tergolong rendah, yaitu 0,0178 ppm untuk P tersedia dan K tersedia 0,06 me/ 100 g. Rendahnya ketersediaan P mungkin disebabkan sebagian dari P diserap oleh kation Ca ++ , sedangkan K tersedia rendah diduga sedikitnya kandungan mineral feldspar (orthoklas, sanidin) dalam tanah (Prasetyo, 2007).…”