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ij _,{- . 18 Thirtieth Awmtal Report of the ` I
  U construed as advising no cultivation, but as advising that form
A   of cultivation which will most effectively control weeds.
  _—   M II. A Series of Experiments Has Been Conducted on the Sta-
Z     tion Farm on Different Methods of Subsoiling.
- _  I 4* Dynamited soil, ordinary subsoiling and soil prepared with
Y ` , the deep tilling machine have been compared with ordinary
    ·   plowing. Alfalfa and corn have been grown on the ground.
      ·._’ Not enough differences in yields have been obtained to pay for
é L   _ the extra cost of preparation. In fact, there has been very t
;— .   _ little difference in yields. ‘
r it .
  I I   . III. Field Crop Experiments.
    1. Com I
j   · Experiments with corn include variety tests, cultivation _
  ;.   tests, strain tests, etc. We are also conducting some experi-
  ._.`   ments in planting corn and soy beans together, to ascertain
  ~   li the relative yield of planting in different ways, and the yields
    ~* of each crop alone. Hogging down soy beans and corn is be-
2   .1  . coming common, and exact information is needed as to whether
  ```,`   ij c it will pay best to plant each alone or the two together.
  2. Wheat
  ._.Q*j.i;.:i,:   The experimental work with wheat may be classified as fol-
  EI . lows :
  i`ge gf} . a. Variety Tests.
if ‘ic·i   A b. Rate of Seeding Tests.
§-yj-,.1} _i°°"— c. Drill Tests.
  .-.4   d. Nitrate Tests.
I I   vi-·   A e. Breeding Work.
Ya`-if   a. We have reduced variety testing to a minimum in re-
  '.—.   . cent years, keeping only a few of the best varieties and adding
  · such new varieties as appear from time to time.
  ` b. Rates of seeding tests have been conducted with cer-
  ` tain varieties that are extensively advertised as requiring but
     
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