Talks on Manures Part 33

Several of the plots with ammonia-salts and mixed minerals, are nearly up to it in grain, and ahead of it in straw.

The _thirteenth_ season (1855-6), gives 14 bushels on the unmanured plot; over 36 bushels on the plot manured with barn-yard manure; and over 40 bushels on 8_a_, dressed with 600 lbs. ammonia-salts and mixed mineral manures. It will be noticed that 800 lbs. ammonia-salts does not give quite as large a yield this year as 600 lbs. I suppose 40 bushels per acre was all that the _season_ was capable of producing, and an extra quant.i.ty of ammonia did no good. 400 lbs. of ammonia-salts, on 7_a_, produced 37 bushels per acre, and 800 lbs. on 16_b_, only 37 bushels. That extra half bushel of wheat was produced at considerable cost.

The _fourteenth_ season (1856-7), gives 20 bushels per acre on the unmanured plot, and 41 bushels on the plot with barn-yard manure. Mixed mineral manures alone on 5_a_ gives nearly 23 bushels per acre. Mixed mineral manures and 200 lbs. ammonia-salts, on 6_a_, give 35 bushels.

In other words the ammonia gives us over 12 extra bushels of wheat, and 1,140 lbs. of straw. Mineral manures and 400 lbs. ammonia-salts, on 7_b_, give 46 bushels per acre. Mineral manures and 600 lbs.

ammonia-salts, on 8_b_, give nearly 49 bushels per acre. Mineral manures and 800 lbs. of ammonia-salts, on 16_b_, give 50 bushels per acre, and 4,703 lbs. of straw.

"This exceedingly heavy manuring," said the Deacon, "does not pay. For instance,

"200 lbs. ammonia-salts give an increase of 12 bushels per acre.

400 " " " " 23 " "

600 " " " " 26 " "

800 " " " " 27 " "

The Deacon is right, and Mr. Lawes and Dr. Gilbert call especial attention to this point. The 200 lbs. of ammonia-salts contain about 50 lbs. of ammonia, and the 400 lbs., 100 lbs. of ammonia. And as I have said, 100 lbs. of ammonia per acre is an unusually heavy dressing. It is as much ammonia as is contained in 1,000 lbs. of average Peruvian guano.

We will recur to this subject.

The _fifteenth_ season (1857-8,) gives a yield of 18 bushels of wheat per acre on the continuously unmanured plot, and nearly 39 bushels on the plot continuously manured with 14 tons of barnyard manure. Mixed mineral manures on 5_a_ and 5_b_, give a mean yield of less than 19 bushels per acre.

Mixed mineral manures and 100 lbs. ammonia-salts, on plots 21 and 22, give 23 bushels per acre. In other words:

25 lbs. ammonia, gives an _increase_ of 4 bush.

(100 lbs. ammonia-salts) 50 " " , " " " " 10 "

(200 " " " ) 100 " " , " " " " 20 "

(400 " " " ) 150 " " , " " " " 23 "

(600 " " " ) 200 " " , " " " " 23 "

(800 " " " )

"It takes," said the Deacon, "about 5 lbs. of ammonia to produce a bushel of wheat. And according to this, 500 lbs. of Peruvian guano, guaranteed to contain 10 per cent of ammonia, would give an increase of 10 bushels of wheat."

"This is a very interesting matter," said I, "but we will not discuss it at present. Let us continue the examination of the subject. I do not propose to make many remarks on the tables. You must study them for yourself. I have spent hours and days and weeks making and pondering over these tables. The more you study them the more interesting and instructive they become."

The _sixteenth_ season (1858-9), gives us a little over 18 bushels on the unmanured plot. On the plot manured with 14 tons farmyard manure, 36 bushels; and this is the highest yield this season in the wheat-field. Mixed mineral manures alone, (mean of plot 5_a_ and 5_b_), give 20 bushels.

25 lbs. ammonia (100 lbs. ammonia-salts), and mixed minerals, give 25 bushels, or an _increase_ over minerals alone of 4 bushels.

50 lbs. ammonia, an increase of 9 bushels.

100 " " " " " 14 "

150 " " " " " 14 "

200 " " " " " 14 "

The season was an unfavorable one for excessive manuring. It was too wet and the crops of wheat when highly manured were much laid. The quality of the grain was inferior, as will be seen from the light weight per bushel.

The _seventeenth_ season (1859-60,) gives less than 13 bushels per acre on the unmanured plot; and 32 bushels on the plot manured with 14 tons farm-yard manure. This season (1860), was a miserable year for wheat in England. It was both cold and wet. Mixed mineral manures, on plots 5_a_ and 5_b_, gave nearly 16 bushels per acre. 25 lbs. ammonia, in addition to the above, gave less than 15 bushels. In other words it gave no _increase_ at all.

50 lbs. ammonia, gave an _increase_ of 6 bushels.

100 " " " " " " 11 "

150 " " " " " " 15 "

200 " " " " " " 16 "

It was a poor year for the wheat-grower, and that, whether he manured excessively, liberally, moderately, or not at all.

"I do not quite see that," said the Deacon, "the farm-yard manure gave an _increase_ of nearly 20 bushels per acre. And the quality of the grain must have been much better, as it weighed 3 lbs. per bushel more than the plot unmanured. If the wheat doubled in price, as it ought to do in such a poor year, I do not see but that the good farmer who had in previous years made his land rich, would come out ahead."

"Good for the Deacon," said I. "'Is Saul also among the prophets?'" If the Deacon continues to study these experiments much longer, we shall have him advocating chemical manures and high farming!

The _eighteenth_ season (1860-1,) gave less than 11 bushels per acre on the unmanured plot; and nearly 35 bushels on the manured plot.

The mixed mineral manures, gave nearly 15 bushels.

" " " and 25 lbs. ammonia 18 "

" " " " 50 " " 27 "

" " " " 100 " " 35 "

" " " " 150 " " 35 "

" " " " 200 " " 37 "

The _nineteenth_ season (1861-2,) gave 16 bushels per acre on the unmanured plot, and over 38 bushels on the plot manured with farm-yard manure.

Mixed mineral manures, gave nearly 18 bushels per acre.

" " " and 25 lbs. ammonia 20 " "

" " " " 50 " " 28 " "

" " " " 100 " " 36 " "

" " " " 150 " " 39 " "

" " " " 200 " " 36 " "

The _twentieth_ season (1862-3), gave 17 bushels on the unmanured plot, and 44 bushels per acre on the manured plot.

Mixed mineral manures alone gave 19 bushels per acre.

" " " and 25 lbs. ammonia 28 " "

" " " " 50 " " 39 " "

" " " " 100 " " 53 " "

" " " " 150 " " 55 " "

" " " " 200 " " 56 " "

When we consider that this is the twentieth wheat-crop in succession on the same land, these figures are certainly remarkable.

"They are so," said the Deacon, "and what to me is the most surprising thing about the whole matter is, that the plot which has had no manure of any kind for 25 years, and has grown 20 wheat-crops in 20 successive years, should still produce a crop of wheat of 17 bushels per acre.

Many of our farmers do not average 10 bushels per acre. Mr. Lawes must either have very good land, or else the climate of England is better adapted for wheat-growing than Western New York."

"I do not think," said I, "that Mr. Lawes' land is any better than yours or mine; and I do not think the climate of England is any more favorable for growing wheat without manure than our climate. If there is any difference it is in our favor."

"Why, then," asked the Doctor, "do we not grow as much wheat per acre as Mr. Lawes gets from his continuously unmanured plot?"

This is a question not difficult to answer.

1st. _We grow too many weeds._ Mr. Lawes plowed the land twice every year; and the crop was hoed once or twice in the spring to kill the weeds.

2d. We do not half work our heavy land. We do not plow it enough--do not cultivate, harrow, and roll enough. I have put wheat in on my own farm, and have seen others do the same thing, when the drill on the clay-spots could not deposit the seed an inch deep. There is "plant-food" enough in these "clay-spots" to give 17 bushels of wheat per acre--or perhaps 40 bushels--but we shall not get ten bushels. The wheat will not come up until late in the autumn--the plants will be weak and thin on the ground; and if they escape the winter they will not get a fair hold of the ground until April or May. You know the result. The straw is full of sap, and is almost sure to rust; the grain shrinks up, and we harvest the crop, not because it is worth the labor, but because we cannot cut the wheat with a machine on the better parts of the field without cutting these poor spots also. An acre or two of poor spots pull down the average yield of the field below the average of Mr. Lawes'

well-worked but unmanured land.