So, too, when we heat vegetable humus to 100°, nitrification is arrested, because the ferment is killed.
Finally, we may sow the nitric ferment in calcined earth and causenitrification to occur therein as surely as we can bring about a fermentation in wine by sowing Mycoderma aceti in it.
These nitrification microorganisms are extremely efficient at reasonable temperatures but cannot survive the extreme high temperatures that a really hot pile can achieve.
This accelerated nitrificationcontinues until the remaining nitrogen balances with the remaining carbon at a ratio of about 12:1.
This ultimate destruction of organic matter is often called nitrification because one of the main substances released is nitrate--that vital fertilizer that makes plants grow green and fast.
Most important, soil contains nitrification microorganisms that readily convert ammonia gas to nitrates, and clay that will catch and temporarily hold ammonia.
This is accomplished by carrying the manufacture of humus up to the point when nitrification is about to begin.
After becoming soluble, the organic matter undergoes further chemical changes, as oxidation and nitrification caused by bacteria.
The ammonia formed as the result of the decomposition of nitrogenous organic matter readily undergoes nitrification changes.
Pasteur had already in 1862 expressed the opinion that nitrification might probably be in some way connected with ferments.
The alkalinity of the last-named solution when nitrification commenced was equal to 447 mgs.
Thus he was unable to start nitrification in a solution maintained at 40° C.
We have adverted to these nitre plantations as showing how the conditions most favourable for the development of nitrification were recognised long before anything was known as to the true nature of the process.
The activity of nitrification in many soils may be hindered by the absence of a sufficiency of lime salts, and in such cases most striking results may follow the application of moderate dressings of chalk.
A subject which has not yet been specially referred to, but which is of great practical importance, is the nitrification of manurial substances.
It goes on probably at a greater rate than the ordinary nitrification of soil-nitrogen.
What kinds of nitrogenous substances are capable of undergoing this process of nitrification are not yet well known.
A point of very much greater economic importance is the total amount formed in the year, and the rate at which nitrification takes place.
That nitrification ever takes place in our soils to this extent is not to be for a moment supposed.
The practical value of gypsum as an adjunct to certain manurial substances, where nitrification is desired to be promoted as rapidly as possible, such as sewage and farmyard manure, will thus at once become apparent.
The same authority states that nitrification does not take place under water, and careful experiments carried out at Tokio show that sulphate of ammonia is a much better manure for irrigated rice than nitrate of soda.
Excess of water drowns the humus, andnitrification cannot go on in a soil the pores of which are closed by excess of moisture.
The action is mechanical and biological, that is to say, due in part to nitrification by bacteria in the upper layers of soil.
Other organisms beside the true nitrification bacteria may be playing a part, and it is impossible exactly to measure the action of the latter, where they began and where the preliminary attack upon the nitrogenous compounds terminated.
Nitrification can take place only in a feebly alkaline medium, but an excess of alkalinity will retard the process.
We are now in a position to consider shortly some of the characters of these nitrification bacteria.
The course of nitrification may be followed by means of chemical tests.
The use of tillage in promoting nitrification is doubtless in part due to the aëration of the soil thus obtained.
But we may say here that by nitrification is understood a process of oxidation of elementary compounds of nitrogen, by which these latter are built up into stable bodies which can do little harm in drinking water.
The next condition of nitrification is the presence of oxygen.
We shall deal at some length with the principles of nitrification when we come to speak of soil.
We would never apply salt in the spring, as it has a tendency to lessen nitrification and to retard the earliness of the shoots.
Aside from this, there will be a large increase in the nitrogen contents of the soil through the nitrification of this organic matter.
Lime, as carbonate of calcium, is also necessary for the process of nitrification to go on in the soil.
In soils that are acid through the accumulation of humic acid nitrification does not go on, and bacterial life is repressed.
Nitrification will not take place in an acid solution; it is essential that some base should be present with which the nitric acid may combine; when all available base is used up, nitrification ceases.
Nitrification is also dependent on the presence of plant-food suitable for organisms of low character.
In the Rothamsted Laboratory, experiments have also been made on the nitrification of solutions of various substances.
The nitrification of the urine had evidently proceeded until the whole of the ammonium had been changed into ammonium nitrate, and the action had then ceased.
The strongest solution in which nitrificationhas at present commenced contained ammonium carbonate equivalent to 368 milligrammes of nitrogen per liter.
Nitrification is most rapid in darkness; and in the case of solutions, exposure to strong light may cause nitrification to cease altogether.
The fact that nitrification will not proceed in the presence of acid reminds us that only a certain degree of acidity can be developed in sour milk.
Technically the last two steps in the process are nitrification proper; but, speaking generally, the term nitrification is used to include the three steps, or both ammonification and nitrification proper.
Nitrification is an altogether--" "Well, I declare!
Among the conditions essential for nitrification may be mentioned the presence of free oxygen and limestone; and of course all bacteria require certain food materials, resembling other plants in this respect.
Thus you will see the absolute need of free oxygen in the nitrification process; and we can control the rate of nitrification to a considerable extent by our methods of tillage.
As I was saying, nitrification has no connection whatever with the free nitrogen of the air.
But research showed that this process of nitrification is dependent on temperature, aeration and moisture, as is life, and that while nitre-beds can infect one another, the process is stopped by sterilization.
Note: The process is going on at all times in porous soils and in water contaminated with nitrogenous matter, and is supposed to be due to the presence of an organized ferment or ferments, called nitrification ferments.
The nitrogen in the dried blood, tankage, fish scrap and cotton-seed meal, being organic nitrogen, must be changed by the process of nitrification to nitric acid or nitrate before it is available.
It undergoes nitrification readily and is a quick acting organic source of nitrogen and phosphoric acid.
The presence of moisture in the soil is necessary for the process of nitrification to take place.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nitrification" in a variety of sentences. We hope that you will now be able to make sentences using this word.
