TABLE 4.-EFFECTS OF COVER CROPS AND FERTILIZER ON THE YIELD OF PECAN TREES.


 Variety and
 Plot No.*


Frotscher**
 1-A*** ...........

 2--A ...........
 B .................

 3-A ..................
 B ..................

 4-A ..................
 B .................

Stuart**
 1-A*** ............
 B*** ............

 2-A ...............
 B ..................

 3-A .................
 B ..................

 4-A ..................
 B .................


YIELD PER TREE IN POUNDS


19311 1932


1933



18.5
29.6

36.7
58.0

20.6
16.6

15.5
1.7

24.1
32.4

23.6
40.0

7.6
12.5

16.4
10.9


1934 Total



62.0 142.1
L15.0 221.4

42.7 133.0
83.6 206.2

16.0 63.9
30.3 88.8

 5.2 49.2
 18.0 57.9


74.6
95.8

74.0
89.5

35.0
50.3

49.6
44.9


 Average Annual
1928-1934 1 1928-1931


Per
Acret


845.1
537.2

323.0
501.5

154.7
215.9

119.0
141.1

180.2
232.9

178.5
217.6

 85.0
 122.4

 120.7
 108.8


Per I Per
Tree I Acret


Per
Tree


20.3
31.6

19.0
29.5

 9.1
 12.7

 7.0
 8.3

 10.6
 13.7

 10.5
 12.8

 5.0
 7.2

 7.1
 6.4


 See Table 2 for cover crops grown in each plot.
 ** Trees set 1904 on Norfolk fine sandy loam soil. Experiment started in 1927.
*** Fertilizers: A, all plots, superphosphate and sulfate of potash only.
 B, all plots, sulfate of ammonia, superphosphate and sulfate of potash.
 t Calculated on basis of 17 trees per acre.


 Average Annual Increase
 of 1932-1934 over
 1928-1931
 1932-1934 Pounds I
Per Per Per Per | Percent
Tree Acret Tree Acref I _


35.3 600.1 26.3 447.1 292.2
56.9 967.3 44.3 753.1 351.5

34.0 578.0 26.2 445.4 335.8
57.1 970.7 48.4 822.8 556.8

13.0 221.0 6.9 117.3 111.2
17.5 297.5 8.4 142.8 92.3

 8.2 139.4 2.1 35.7 34.4
 9.9 168.3 2.9 49.3 41.4

 15.2 258.4 8.0 136.0 111.1
 22.2 377.4 14.9 253.3 204.1

 14.1 239.7 6.2 105.4 78.4
 20.2 343.4 13.0 221.0 180.5
 4.6 78.2 -0.7 -11.9 -13.2
 10.1 171.7 5.1 86.7 102.0

 8.5 144.5 2.5 42.5 41.6
 6.8 115.6 0.7 11.9 11.4


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