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THE FARMERS' COLUMN. -

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THE FARMERS' COLUMN. TOP-DRESSING CeitN.-Although it is still early to top-dress corn with nitrates, it is not (remarks Pro- fessor John Wrightson, in his seasonable notes in the Agricultural Gazette) too soon to apply mineral manures. The subject is of considerable import- ance, and it is one upon which thoroughly practical men may possibly require guidance. Many farmers do not believe in top-dressing their corn crops; others reserve top-dressing for those crops only which are prematurely in the sear and yellow leaf, and the operation becomes a dernier ressort, and is conse- quently not likely to prove highly satisfactory. Top- dressing should not be done on crops which are robust and thick in plant, because the limits of good farm- ing are soon reached, and a laid crop is generally in- ferior to an upstanding one. The proper light in which to view this question is that of the past history of the field, taken in connection with the natural character of the soil. WHEAT AFTER MANGEL.—The land is necessarily impoverished, and the more so in exact proportion to the bulk of the previous crop. A 40 ton crop of mangel takes a large weight of the available plant food out of the soil, and this is held within the mangel, or in the dung of the animals fed upon it. It is temporarily removed from the land, and perhaps a field iq seldom in so reduced a condition as it is after a heavy crop of mangel has been carted off it. Wheat is at this time often taken, and farmers have frequently found cause to complain of a small yield. This, then, appears to be a proper period to apply a top dressing. WHEAT AFTER POTATOES is similar in its require- ments to wheat after mangel, and when the crop is sold, the loss of fertilising matter, although less than in the case of a heavy mangel crop, is a permanent privation to the farm, and may therefore well be com- pensated for by a well-selected top-dressing. N WHEAT AFTER SWEDES AND TURNIPS.-If these crops have been wholly or even partially drawn off the land, the same argument holds good as in the case of mangel, although possibly in a less degree. In both cases the land has probably received a dressing of dung, but even with this help it will be found that the root crops have been a heavy drain upon the resources of the land. On the other hand, if the roots have been consumed by sheep upon the land, with the usual additions of hay, or of corn and cake, it may appear unnecessary to go to further expense. Allowance must be made for those cases in which a breeding flock has had access to the roots through the day, and been folded upon grass during the night, as this is tantamount to carting off the roots; and here top- dressing may properly be resorted to. WHEAT AFTER CLOVER,-If the clover has been mown, top-dressing may be used as a means of making up for a direct loss, but here also much must be left to judgment, because it has been proved in practice that a clover crop mown leaves the land in equal condition with a clover crop grazed. If the land has been dunged it is probable that further dressing will not be necessary. BARLEY AFTER WHEAT.—This appears to be a crop which may be top-dressed with advantage. The land has suffered, not only from what the wheat has carried away with it, but also from the still greater loss of nitrates, which have drained away into the subsoil beyond reach of the barley roots. Such barley is often more likely to excel in quality than in quantity, and a dressing of nitrate of soda gives back to the land precisely what has been wasted, and quality with quantity is the result. THE SCIENCE OF TOP-DRESSING.—The remarks now being made have reference tc the top-dressing of corn crops only, and these crops are chiefly dependent upon nitrates. To say this does not argue any want of appreciation of the importance of the mineral food of plants. Still there is a fundamental difference between ordinarily farmed land and a Bothamsted experimental plot. In the latter, the system for the last 40 years has been to remove the entire crop, and to keep up the fertility of the land by direct manuring. In those plots where nitrates or ammonia salts have been exclusively applied, the land becomes gradually exhausted of phosphoric acids and alkalies. When land is ordinarily farmed there is not the same exhaustion of minerals. The constant change of crop- ping, the frequent additions of dung, the feeding of roots, hay, and purchased or home-grown corn upon the holding, are sufficient guards against the ultimate exhaustion of the mineral matter required by growing plants. The customary additions of superphosphate to the turnip crop also act in the same direction. WITH THE NITRATES formed within the eoil it is different. It has been well said that the principal low of nitrates is due to drainage or percolation, and, therefore, both direct abstraction and loss by drainage, as well as the extremely small quantity of available nitrates in the soil favour the idea of top- dressing with nitrate of soda. We are aware that sulphate of ammonia is a worthy competitor with the nitrate, but there is no advantage in shutting our eyes to the fact that nitrate of soda is the more potent weapon of the two, even although it requires 225 lb. of the nitrate to supply the same quantity of nitrogen (43 lb.) as 200 lb. of sulphate of ammonia. Nitrate of soda is at present quoted at £ 9 10B. per ton, or close upon Id. a pound. The long- continued experiments at Bothamsted have resulted in the possibility of a statement as to what nitrate of soda is eapable of yielding in increased grain crops. Taking a period of over 40 years, it is known that in order to produce an increase of one bushel (601b.) of wheat and the accompanying straw (1051b.), 51b. of ammonia or its equivalent in nitrogen are required. Now, 501b. of ammonia or its equivalent in nitrogen are represented by 2cwt. of sulphate of ammonia, or 2Jcwt. of nitrate of soda of good commercial quality, and we may. therefore, consider that these quantities applied to an acre of land under wheat, would give an average increase of 10 bushels of wheat and 10501b. of straw. The cost of the nitrate of soda, at 9s. 6d. per cwt., would be 21s. 4 £ d., and the produce in wheat alone, owing to its use, would be about 45s., while the straw would be worth about 20s. The straw would in this case nearly pay for the dressing, while the grain would be almost all profit. 80 far as exact figures may be relied upon, this, therefore, appeared to be the state of the case with reference to nitrate of soda. SUPERPHOSPHATE AND KAINIT.-These mineral manures do not, when used alone, produce a marked effect upon wheat. They may, however, be applied with nitrate of scda with advan- tage. The sum of the Bothamsted results may be illustrated by the following figures. On those plots on which nitrate of soda was used year after year, and mineral food was not deficient, 51b. of ammonia (or of nitrogen reckoned as ammonia) were required to Eroduce an increase of one bushel of wheat. When, owever, the nitrate ^as combined with sulphate of potash, sulphate of soda, sulphate of magnesia, and superphosphate of lime, its efficacy was in- creased. This fact is more clearly shown in the case of barley. The quantity of ammonia or its equivalent in nitrogen required to produce one bushel of barley when ammonia alone was applied is from Sklb. to 3!lb. When, however, superphosphate is added to the ammonia salts the amount of ammonia re- quired is reduced to 2 £ lb. and less. These figures, therefore, indicate that superphosphate is a valuable adjunct to sulphate of ammonia, as it also is to nitrate of soda. It has been obiected that nitrate of soda and sulphate of ammonia are one-crop manures,"and it is certain that they do not tell upon the next crops when used inconsecutive corn growing as at Rothamsted. It is in fact most curious to note that after years of manuring with nitrate of soda the yield of such plots immediately sinks to the level of the unmanured plot when the dressing is withheld. The contrast in per- manence of effect between nitrate of soda and farm yard manure is strikingly in favour of the latter. If the nitrate of soda plots and the farmyard dangplot are compared, the cropping results may posaiibly be in favour of the nitrate. It is, however, true that while the nitrate plots have not increased in fertility, the plot continuously manured with dung has stored up an amount of 17,0001b. of nitrogen per acre, chiefly in the top nine inches of soil, and has, in fact, almost doubled the amount of nitrogen in the soil. It is said that it would take 150 years to exhaust the farmyard manure plot, and bring the land down to its previous level, always supposing there was no evolution of free nitrogen or waste through drainage. It is also worthy of attention that mineral manures such as kainit and super- phosphate may be relied upon to remain within the soil and add to its permanent fertility for a period of at least 40 years. There must, therefore, be a greater satisfaction in applying these mineral sub- stances to the soil in combination with nitrate of soda, than in withholding them. So far we have looked at the subject from a Rothamsted stand- point. Let us take our attention for a moment off the nitrate of soda plots at Bothamsted, where the corn and straw are always removed, and where the residue of the nitrate finds its way into the drainage water. Let us think of what really happens upon a farm. The nitrate of soda is no longer a rapidly acting but quickly- wasting fertiliser. It becomes as permanent as farm- yard manure itself. The Bothamsted lesson as to a quick passage to drains becomes inapplicable. First we obtain, by the use of the nitrate, an abundance of straw; and if we apply the same dressing to the mangel crops we obtain an abundant increase in tons of mangels. Here, then, is the secret of permanence in nitrate of soda. The straw and the mangel make dung, and the rapidly-acting and quickly-dissolving nitrate is converted on the farm into our old and tried friend farmyard manure

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