![Page 1: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/1.jpg)
Fertilization
![Page 2: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/2.jpg)
Objectives
• What factors affect fertilization decisions
• How to find information needed
• How to calculate application costs
![Page 3: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/3.jpg)
Silvicultural Tools
• Plant
• Kill
• Ameliorate site
![Page 4: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/4.jpg)
Ameliorate Site
• Irrigate
• Drain
• Subsoil
• Fertilize
![Page 5: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/5.jpg)
Fertilize
• What?
• How much?
• When?
• How?
![Page 6: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/6.jpg)
The Details
• Fertilizer guide:
http://www.for.gov.bc.ca/tasb/legsregs/fpc/fpcguide/fert/ferttoc.htm
Written in 1995 (Forest Code)
![Page 7: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/7.jpg)
What
• Law of the minimum
• Law of compensation
![Page 8: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/8.jpg)
Law of the Minimum
• Growth is limited by whatever factor is most need
![Page 9: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/9.jpg)
Nitrogen
Poten
tial Grow
th
Actu
al Grow
th
![Page 10: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/10.jpg)
Law of Compensation
• The addition of one factor can increase the efficiency that a tree uses another factor
![Page 11: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/11.jpg)
Law of Compensation
With P
Amount of N
Gro
wth
Rat
e
![Page 12: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/12.jpg)
How Much?
• Rule of efficacy
• What is needed
• Cost
• Returns
![Page 13: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/13.jpg)
Rule of Efficacy
• Diminishing returnsG
row
th
Amount of “X”
![Page 14: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/14.jpg)
Nutrient Cycling
•Availability• CEC• Weathering• Mineralization• C:N• Nutrient capital• Translocation
![Page 15: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/15.jpg)
Fertilization
• Affects trees
• Does not affect site
![Page 16: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/16.jpg)
Ratings
• Amount (percentage) of elemental Nitrogen (N); Phosphorous pentoxide (P2O5); and Potassium oxide (K2O)
• Ex. 12-20-10 = 12%N; 20% (P2O5); 10%(K2O)
![Page 17: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/17.jpg)
Ratings
• 100kg would then have 12kg N; 20kg (P2O5); 10kg (K2O)
• Atomic weights:
N=14.01 K=39.10
P=30.98 O=16.0
![Page 18: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/18.jpg)
Ratings
(P2O5) = (2 * 30.98)
(2 * 30.98) + (5 * 16.0)
or 43.65% P
So 43.65% of 20kg = 8.7kg P
![Page 19: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/19.jpg)
Analysis
• Soil
• Foliar
![Page 20: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/20.jpg)
Effect
• Affects plants
• Does not affect site (response is shortlived)
• Affects stand dynamics
![Page 21: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/21.jpg)
Target Species
• Non-trees can have more rapid uptake
• Can be detrimental (more competition)
![Page 22: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/22.jpg)
When?
• Get above competition during establishment
• Increase diameter just before thinning or harvest
• Shorten rotation
![Page 23: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/23.jpg)
How?
• “Teabags”
• Sidecast
• Helicopter
![Page 24: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/24.jpg)
![Page 25: Fertilization. Objectives What factors affect fertilization decisions How to find information needed How to calculate application costs](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f395503460f94c55932/html5/thumbnails/25.jpg)
Cost
• Application plus fertilizer
• How much will reach trees?
• Most effective on medium site indicies