Download or read book Effect of Vacuum Pumping on Lateral Movement of Sap in the Maple Tree Bole written by Barton M. Blum and published by . This book was released on 1968 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: S2Our recent studies of maple sap production have shown that invented tubing collection systems yield more sap than vented tubing systems, and that these increases are related to natural vacuum that develops in the unvented systems. Application of additional vacuum with a vacuum pump produced a further increase in sap yield. In these studies we used a paired-taphole type of experimental design. Two tapholes were drilled 6 inches apart on the same tree; one taphole of each pair received one treatment (vacuum) while the other was a control (no vacuum).S3.

Download or read book Report written by Northeastern Forest Experiment Station (Radnor, Pa.) and published by . This book was released on 1966 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Forest Service Research Paper NE written by and published by . This book was released on 1963 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book At the Northeastern Station written by Northeastern Forest Experiment Station (Radnor, Pa.) and published by . This book was released on 1967 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparison of Four Survey Techniques Used in Outdoor Recreation Research written by Elwood L. Shafer and published by . This book was released on 1967 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: S2Because of the great and growing interest in outdoor recreation, many studies are being made by private and public agencies that need information for planning use of land and facilities for recreational purposes. In these studies much attention is being given to the people who use recreational facilitieswho they are; where they come from; what they like; what they want; how much they are willing to spend. Many types of surveys are being used in studying these people. The main question in planning a survey of this sort is: What survey technique can be used that will provide the most reliable and valid results at the least cost? To get an answer that we could use in our recreation research program, we made a study of four different survey techniquesa personal interview, a handout questionnaire, an immediate mail questionnaire, and a delayed mail questionnaire. Results show that the delayed mail survey, conducted 3 months after the camping experience, gets the best results at the least cost. Our study is described here for the benefit of other research workers in outdoor recreation.S3.

Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1969 with total page 1220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forest Service General Technical Report NE written by and published by . This book was released on 1980 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sugar Maple Research written by and published by . This book was released on 1982 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book General Technical Report NE written by and published by . This book was released on 1980 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Year at the Northeastern Station written by United States. Northeastern Forest Experiment Station, Upper Darby, Pa and published by . This book was released on 1968 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hearings written by United States. Congress. Senate. Committee on Appropriations and published by . This book was released on 1968 with total page 1988 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USDA Forest Service Research Note NE written by and published by . This book was released on 1969 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1969 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Forest Service Research Note NE written by and published by . This book was released on 1966 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research and Development Reports written by and published by . This book was released on 1969 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt: