1
00:00:00,120 --> 00:00:01,350
- [Mark] This is Mark Isselhardt,

2
00:00:01,350 --> 00:00:04,130
Maple Specialist with
University of Vermont Extension.

3
00:00:04,130 --> 00:00:06,060
This is a Vermont Maple Minute.

4
00:00:06,060 --> 00:00:08,860
Sap flows out of trees due
to the difference in pressure

5
00:00:08,860 --> 00:00:11,820
between the inside and
outside of the tree.

6
00:00:11,820 --> 00:00:15,120
In the 1950s, maple
researchers and producers

7
00:00:15,120 --> 00:00:18,000
found that adding vacuum
pumps to tubing systems

8
00:00:18,000 --> 00:00:20,240
could increase this pressure differential,

9
00:00:20,240 --> 00:00:22,150
and thereby, increase sap yields.

10
00:00:22,150 --> 00:00:25,330
At the time, repurposed
dairy pumps were used.

11
00:00:25,330 --> 00:00:27,210
Use of modern equipment, materials,

12
00:00:27,210 --> 00:00:29,150
and techniques for tubing systems,

13
00:00:29,150 --> 00:00:31,300
combined with a proper vacuum pump,

14
00:00:31,300 --> 00:00:34,290
can result in yields two
to three times higher

15
00:00:34,290 --> 00:00:37,970
than that from traditional
bucket or gravity sap collection.

16
00:00:37,970 --> 00:00:40,740
The use of vacuum does not
result in additional damage

17
00:00:40,740 --> 00:00:41,600
to the tree.

18
00:00:41,600 --> 00:00:43,410
This has been a Vermont Maple Minute.

19
00:00:43,410 --> 00:00:44,530
I am Mark Isselhardt,

20
00:00:44,530 --> 00:00:47,230
Maple Specialist with
University of Vermont Extension.