— 55 — 
means that it is more than the average alfalfa plant on 
which the top equals or exceeds the root in weight. 
STUBBLE.* 
Two efforts were made to determine the ratio of the 
stubble to the crop removed where the stubble includes the 
roots to the depth that they would be cut by the plow and 
the stems to the hight left by the mowing machine. In the 
first attempt the ratio of the stubble to the tops was de¬ 
termined by cutting off the plants at the depth of six or 
seven inches below the crown, weighing the whole plant, 
and then removing the top about as a mowing machine 
would cut it and weighing each. In this manner we would 
detect any loss if it occurred, d he result of this method 
was that we found the ratio of 1:1.4 for the stubble to the 
green crop as cut for hay making. The second method 
was by plowing up a small piece of alfalfa five days aftei it 
had been cut, picking out the roots, and weighing them. 
The result of this was, allowing two and one-half tons tor 
the total dry matter cut off of one acre at first cutting, that 
we obtained the ratio of 1:1.69. The agreement here is 
better than we expected, as the plants in the first case weie 
all large, and, growing singly, and had larger than average 
crowns ; while the second observation was made upon a 
field with a good stand in which the plants were crowded 
compared with the others. We are not far from the truth 
when we assume that the stubble turned undei after le 
first cutting bears the ratio of 1:1.5 to the green crop re¬ 
moved, or is equal to two-thirds of the green alfalfa which 
has been cut, assuming that there has been no loss by fall¬ 
ing off of leaves, breaking off of stems, etc., to which sub¬ 
ject reference has already been made. 
Three plats of 675 square feet each were plowed U P at 
the end of April (April 28-29-30), and the stubble carefully 
picked out and weighed. On May 26, after having ee 
kept for upwards of three weeks in the laboratory, the re- 
suits obtained were, for Plat No. i, 526,793 P th f 
acre, ten years old, and 3.34 tons stubble. Plat No 
445,514 plants to the acre, one year old, .81 tons. Plat No. 
5, 70,238 plants to the acre, ten years old, 2 -55gons 
stubble per acre. Omitting the one-year-old plat n0 0 
would plow up a good stand of one-year-old alfalfa undei 
ordinary circumstances we have an average o --94 
of air-dried substance per acre. On a subsequent page 
under the manurial value of the stubble, it will be seen that 
we assume the amount to be 2.86 tons for plants five_ years 
old. This quantity was arrived at by accurately weighing a 
