TABLE XXI

Average yields of corn in bushels per acre, with and without

*The minus sign (—) indicates a loss in every case.

The following in table XXII is a summary of the results with, and aggregate results of the ten years trial.

TABLE XXII.

Average and Aggregate Yields of Corn for Ten Years.

As the effect of the horse manure had not vanished in 10 years, it was decided to continue the experiment with the three horse manure and six flanking plats in order to get the full effect of the manure. The results of the remaining six years to-date are as follows:

TABLE XXIII.

Yields and increase per acre from horse manure applied in 1883 and 1884.

The following in table XXIV is a summary of the results with horse manure for 16 years.

The yields of corn stover in this experiment are given below, in table XXV, for eight years for the entire series, and in table XXVI, for 14 years for the horse manure and flanking plats. The crop of stover was not weighed in 1886 and 1887.

TABLE XXV.

Average and aggregate yields of corn stover for eight years.

The results of the experiment are summed up in table XXVII.

Comment on the record of the gas lime and ammoniated phosphate is unnecessary. The results obtained from horse manure are not only very encouraging, but they show clearly the unwisdom of short tests of stable manure, as the beneficial effect on the yield extends over many years.

Assuming that the yields of stover in 1886 and 1887 were equal to the average yield of the other years of the test, we find that the horse manure produced an aggregate increase per acre of 131.8 bushels corn, and 6242 pounds stover. Reckoning the stover worth $5.00 per ton and the corn 30 cents per bushel, the value of the increase is $55.14.

In view of the probable losses of plant food between crops in the earlier years of the experiment, and the diffusion of the solubie fertility from the manured to the unmanured plats, the results secured, emphasize very strongly the importance of husbanding wisely, and of utilizing fully all the home made manure of the farm.

TEST OF CORN CULTURAL IMPLEMENTS.

By W. C. Latta.

The test of corn cultural implements was begun in 1888 and has been carried on continuously for eleven years. Owing to a severe protracted drouth in 1893 no results of value were obtained

for that year.

During the first five years of the test the corn was planted only in drills and consequently the cultivation was "one way" only. In 1893 the plan of the experiment was changed to permit trial of the implement in hill planted as well as drill planted corn.

Since that date the drill has been cultivated one way only as before, and the hill planted corn has been regularly cultivated both ways.

IMPLEMENTS UNDER TRIAL.

Albion spring-tooth cultivator.

This is a wheel cultivator with

six teeth in each gang. It thoroughly stirs the entire surface to the depth of two or three inches and leaves the soil well pulverized and fairly level.

Corn plow. This is the earliest form of two horse corn cultivator with two hoes or shovels in each gang. This implement' does not stir the entire surface nor does it pulverize the soil very thoroughly. It runs deeper than the spring tooth cultivator and throws the soil into furrows and ridges, thus tending to dissipate soil moisture.

The Hoober cultivator. This implement has two blades in each gang and its action is to shave the soil just a little below the surface. It stirs the soil only to a slight depth and it tends to draw the dirt toward the corn rows.

Tower cultivator. This implement shaves the soil like the one just described. It has four blades in each gang and the gangs may be reversed so as to throw the soil alternately to and from the corn rows.

Breed's weeder and harrow. These tools have been used together, Breed's weeder being employed for the first two or three cultivations and the one horse harrow being used for the later cultivation. The action of both these implements is quite superficial.

Hoke cultivator. This is a very high arch cultivator, which adapts it well for the later cultivation. It has four spring teeth in each gang. The points of the teeth are wider than those of the