TABLE 3.-EFFECTS OF COVER CROPS AND FERTILIZERS ON THE GROWTH 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 ............................


Growth increment per tree, area of trunk cross section in square inches


1928




10.2
12.1

8.5
10.6

8.0
3.5

10.2
5.8


8.7
10.4

7.8
11.1

7.1
8.9

7.9
9.7


I I Average Annual


1929




10.5
6.7

9.8
11.0

8.5
6.0

7.7
5.0


7.8
9.1

4.1
5.9

2.9
3.6

4.5
6.0


1930




5.2
11.5

6.1
11.4

4.6
5.3

1.6
7.9


6.4
11.2

6.9
5.6

3.3
3.5

4.4
5.5


1931




2.1
2.6

2.1
3.7

1.9
2.2

5.2
3.5


3.0
2.3

1.6
2.6

1.2
4.6

1.7


6.6I I .


1932 1933




11.4 4.6
12.3 5.0

10.4 3.1
12.6 3.1

8.3 1.4
9.2 2.5

6.8 2.0
7.9 3.5


 See Table 2 for cover crops grown in each plot.
 ** Trees set 1904 on Norfolk fine sandy loam soil, experiment started 1927.
*** Fertilizers: A-All plots; superphosphate and sulfate of potash.
 B-All plots sulfate of ammonia, superphosphate and sulfate of potash.


1928- 1928-
1934 1931



S7.4 7.0
8.6 8.2

7.3 6.6
9.2 9.2

5.2 5.7
5.5 4.2

5.6 6.2
6.5 5.5


Total




 52.2
 60.6

 51.2
 64.4

 36.3
 38.7

 39.4
 45.3


 46.5
 63.9

 43.3
 49.8

 25.1
 36.0

 33.8
 42.8


1932-
1934



8.1
9.2

8.2
9.2

4.4
7.2

4.9
7.7


6.8
10.3

7.6
8.2

3.5
5.1

5.1
6.6


Increase 1932-34
 over 1928-31

Sq. in. | Percent


 1.1 15.7
 1.0 12.1

 1.6 24.2
 0 0

-1.3 -22.8
 3.0 71.4

-1.3 -20.9
 2.2 40.0


, v... ...


v.


, ... ,


, .. ,