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TABLE IV.— YIELD OF SCREENED AND OPEN RADISH BEDS DURING 1916.

(Counts and weighings based on rows of 100 feet in length.)

SCREENED.

UNSCREENED.

No. 768

April 4

Lbs. 028.

May 27

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April 4

April 11

May 29

852

5

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April 11

April 18
April 25
May

6

6 May

6 May

6

June 2
June

5
June 15
June 15
June 15
June 15

917 652 493 696 748 812

6 5 4 5 5 5

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May

2 8 3 13 2 12 2 12 1 1 0 8 1 12 1 10 1 1 7

Lbs. 028.

1 5
1
1 5
1 7
0
0
1 5
013
0 10
0 14

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May

SUMMARY.

Average per 100 feet screened Average per 100 feet unscreencd.

No. 742 650

No. 496 211

Date

of 80wing.

Date

of pulling

Plants

Total weight.

Market

Weight of

market-
able

able
roots.

roots.

Weight

of leaves.

Date

of sowing

Date

of pulling.

Plants.

Total weight.

Market

able roots.

Weight of
market-

able
roots.

Weight

of leaves.

Plants.

Total
weight.

Roots
marketable.

Weight of
marketable

roots.

* At this date plants in unscreened beds had not grown as fast as the screened beds; 80 a later pulling was made in order that the comparisons should be fair.

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two weeks behind the average. The temperatures in screened and

. open beds and conditions of growth of the plants are noted in Table V, while the yields of the different plats are recorded in Table VI.

TABLE V.- RECORD OF TEMPERATURES DURING EXPERIMENTS OF 1917

WITH NOTES ON GROWTH OF PLANTS.

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UNSCREENED

PLATS.

DATE.

Remarks.

Max. .

March 26.

28..

Plat I was sown on March 23.

29

Degs. F. Degs. F. Degs. F. Degs. F.

26 62 28 60
27 64 26 66
31 41 32 41
26 44 28 45
28 49 28 49

Plat II was sown on March 30.

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4.
5.

No plants showing above ground.

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61 50 59 43 37

Plat III planted April 6.
Screens covered with snow.

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10... 11.

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41 Ground frozen solid, remaining

so until April 11. 41 42 No plants showing above ground

in any of the plats. 58 In Plat I plants beginning to

push thru ground both outside and beneath screening. Rows not yet distinctly marked; little difference between screened and open beds. Plat IV sown

on April 12. An occasional plant showing thru ground under screening, none

outside.
51
38
46
43

In Plat I outside sowing not up

and entire plat not as far

along as Plat II,

In Plat II many plants under 46

screening up, but rows not clearly indicated. In uncovered areas plants just beginning to push thru ground.

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TABLE V.- RECORD OF TEMPERATURES DURING EXPERIMENTS OF 1917

WITH NOTES ON GROWTH OF PLANTS (continued).

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SCREENED

PLATS.

UNSCREENED

PLATS.

DATE.

Remarks.

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Max.

April 18....

areas.

19......

20....

Degs. F. Degs. F. Degs. F. Degs. F.
35 74 34 63 In Plat I poor stand under

screening, not as good as
screened plants in Plat II; no
plants showing in uncovered

In Plat II majority of plants up in screened frame and rows show distinctly, while in open bed only a few seedlings

have appeared. 47 79 47 71 In Plat I very poor stand under

screening, while in open bed only an occasional plant shows. In Plat II an almost perfect stand in screened frame, while in uncovered bed about 20 per ct. of seedlings are up.

Plat V sown on April 19. 50 76 51 71 In Plat III, under screening,

about 25 per ct. of plants are showing above ground while none have appeared in the open bed. In Plat IV an occasional plant shows in screened frame, but no seedlings are showing in uncovered

bed. 52 71 53 71 39 76 39 74 37 71 36 69 In Plat III plants well up, both

inside and out. In Plat IV, plants practically as far along as in Plat III. Seedlings well up outside and beneath screen

ing. 31 63 31 57 29 65 25 54 In Plat V plants are coming up

rapidly under screening; no

plants as yet in open bed. 41 64 42 62 In Plat V rows under screening

well up. In open bed a few plants pushing thru ground all

21..

22.
23...

24.
25..

26......

over bed.

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64 | Plat VI sown on April 27. In

Plat V about 30 per ct. of sow

ing is up in open bed.
48
70
68
56

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May

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TABLE V.- RECORD OF TEMPERATURES DURING EXPERIMENTS OF 1917

WITH NOTES ON GROWTH OF PLANTS (continued).

SCREENED
PLATS.

UNSCREENED

PLATS.

DATE.

Remarks.

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Degs. F. Degs. F. Degs. F. Degs. F.

38 55 38 54
34 42 35 43
32 50 32 50 Plat VII down on May 4.
37 51 37 50
38 52 38 51
34 51 34 50 Seedlings in Plat VI just begin-

ning to appear beneath screen-
ing. No plants showing in

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open bed.

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58 In Plat VI rows under screening

are distinctly marked. In open

bed plants have not yet started. 62 In Plat VI seedlings in open bed

just beginning to appear. Flea beetle injury first noticed, and first record of appearance of

radish maggot fly. 63 Plat VIII sown on May 10. 61 54 | In Plat VII, plants beginning to

appear under screening. In open beds no plants are show

ing. 56 63 68 | In Plat VII, under screening,

rows now distinctly marked. In open area plants beginning to push thru. Flea-beetle injury common, but few insects

observed. 62 54 In Plat VII, under screenings,

rows all filled, plants well up. In uncovered area rows not yet clearly outlined. In Plat VIII an occasional plant up. No

plants showing in open beds. 64 76 In Plat VIII rows well up in

screened area, but only a few

plants showing in open bed. 82 62 In Plat VIII rows almost all up

in open bed. In Plat IX no plants up either under screening or outside. In Plats I and II some roots nearly of marketable size.

16....
17.

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18...
19...

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20...

21

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TABLE V.- RECORD OF TEMPERATURES DURING EXPERIMENTS OF 1917

WITH NOTES ON GROWTH OF PLANTS (concluded).

SCREENED

PLATS.

UNSCREENED

PLATS.

DATE.

Remarks.

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Degs. F. Degs. F. Degs. F. Degs. F.

43 68 44 63
45 57 46 56 In Plat IX, under screening,

plants beginning to show; none
in open area. In Plat VIII

plants in open well up. . 37 55 37 56 36 50 37 49 In Plat IX, in uncovered bed,

plants just pushing thru ground. Under screening

rows are fairly well outlined. 40 63 42

60 44 75 44 72 44 74 44 73 Pulled Plats II and III under

screening 47 53 47 52 36 62 35 60 40 79 37 72 Pulled Plats I, IV and V under

screening, and Plats I, II, III

and IV in open beds.
54 76 55 76
51 76 52

76
62 74 60 73
46 70 45 68 | Pulled Plat V in open bed.
51 84 52 80
51 67 51 68
50 76 49 75
50

48 74
50 69 49 71
59 80 58 79
53 74 52 74
50 69 48 67 Pulled both screened and open

bed of Plat VI on June 12; Plats VII and VIII on June 15; and Plat IX on June 22.

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Total temperatures ..

2,914 | 4,724 | 2,927 | 4,558 Average per day. 38.34 62.16 38.51 59.97

Average daily

difference.

Min. 0.17

Max. 2.13

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