You have not indicated the value of the C:N ratio. However, there is a good range of C:N ratio which makes N available to plants. Therefore, N became deficient to the plants because your plant residue has not reached it's final stage of decomposition.
When we add carbon sources in soil with wide C:N ratio, microbes start multiplying. These microbes need high amount of nitrogen for its body cell development. Hence a temporary N deficiency occurs in soil which reflects on plants as N deficiency.
Yes, Rajan microbes need N for decomposition process and bodu building and it take from soil simultaneously plant deficit for N for short time
Application of organic biomass with high C:N results into proliferation of microbial numbers abruptly, needing available soil nutrients and N in particular, resulting into immediate net immobilization of soil available N, resulting in nitrogen deficiency for the plants. This condition is temporary. Kindly go through the chapter of The Nature and Properties of Soil by Brady. Nicely elaborated with figures and the text.
There are huge materials on OM, CN ratio and nitrogen mineralization immobilization. Two text books the Brady's book and the book on Soil Fertility, Theory and Practices by ICAR,New Delhi explains OM and related issues nicely for the students and others. In the ICAR book the chapter written by Dr. Ambika Singh and Dr. B. Lal.
Thanks Dr. Pramanick.
It is also explain in my book "Fundametal of soils and plant nutriens"
Different sources of OM differ in C:N ratios. Which material was used in your case. Nitrogen becomes immobilized when using high C:N ratio OM as the soil microbes require it for their nutrition and energy to break down the carbon in the OM.
In the case of wide C:N ratio of the organic matter, immobilization takes place to make ratio closer which is needed for the nutrition and energy of soil microbes to decompose the organic matter.
Dr Mahapatra suggeste d good book and also consulted other's book like published by ISSS, new Delhi. You also used decomposer available in market for quickly decomposed the OM and no face to N deficiency
Because N limiting condition is created. Cell generally have C:N ratio of ~10:1. Unlike N uptake, microbes respire about 50% of their C uptake. Hence any C:N ratio >20:1 will generally create a condition which is microbial-N limiting. Once this happens, there's N uptake to restore the cell's C:N ratio of ~10:1.
It is well known that plant prefers to accept almost a definite ratio of carbon and nitrogen and on this basis succession of microbial community occur. Higher C/N ratio implies that the organic matter contains either higher amount of carbon in comparison to N or lower amount of N in comparison to C. This unstable nutrient status gets stabilized by the action of microbial community through immobilization of these nutritional components.
Yes, ghos it is so, but plant also suffer from nitrogen deficiency
Normally the C:N ratio of organic matter is in narrow range only i.e 10-20:1 ...hence immobilization will not occur after application to the soil...immobilization occurs with applied crop residues has wider C:N ratio ...residues stimulate the microbial population... at the same time the applied resiudues has low nutrients ...the microbes starts taking nutrients from the soil for their growth.. hence actual crop suffers for want of nutrients..
the organic matter at high C: N ration forcing microbes to take up N from the soil. this organic matter have an advantage when you applied a fertilizer that has a high amount of NH4-N as liquid manure or digestate and you can use as a bulking agent for composting.
they applied to the soil carefully to avoid N immobilization or N deficiency from plants.
C: N ratio is the ratio between carbon and nitrogen in the soil. high or wider C: N ratio means higher amount of carbon compound with lesser amount of nitrogen while narrow C: N ratio means having less carbon but high nitrogen..we know that nitrogen is very important nutrient which is needed to decompose the organic matter. when organic material of wider C: N ratio is applied in the soil, it started decomposition process as different soil micro organisms began to Attacks on it.due to less amount of nitrogen present in the material which we had applied in soil or say wider C: N ratio, there will be keen competition for nitrogen among the micro organisms to build up tissue and food for survival, they begin to start immobilizing the nitrogen (Conversion of inorganic ions to organic N like protein, amino acids etc for assimilation) or taking up available form of nitrogen from the soil hence less amount of nitrogen will be remained in the soil. that's why plants are unable to take or shows n deficiency.
When OM having high C:N ratio is applied to soil, It provide high amount of substrate (food, in form of C) to soil microbes which leads their fast proliferation. These fast multiplying microbes needs nitrogen to build their body, but OM is already poor in nitrogen. So, microbes uptake required nitrogen from soil which results in its temporary deficiency in soil.
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