Evaluation of Composted Poultry Manure & Potassium as ... workgroup... · Steve & Sam Meek & John...
Transcript of Evaluation of Composted Poultry Manure & Potassium as ... workgroup... · Steve & Sam Meek & John...
Evaluation of Composted Poultry Manure & Potassium as Plant Nutrient Supplements
in Tomatoes
BEN LEACOX, AGRICULTURAL TECHNICIAN, UC, WOODLAND MIKE DAVIS, PLANT PATHOLOGIST, UC DAVIS GENE MIYAO, FARM ADVISOR, UCCE, YOLO, SOLANO & SACRAMENTO COUNTIES
Composted poultry manure, K applications, & chemigations Yolo-Zamora area, 2014 (as supplements)
K = 157 ppm @ 2.5% K on CEC
Composted manure, NPK and K applications, Muller Ranch, Yolo-Zamora area, 2014
composted manure 10 T/A
composted manure
5 T/A Sidedressed
K (as KCl)
manufacturer NPK to mimic compost rates
lbs/ton (%) availability 76 lbs N (3.8%) 20% 48 lbs P205 (2.4%) 80% 58 lbs K2O (2.9%) 80% 7:1 C:N
Composted poultry manure applications (supplemental)
Yield response expected < 180 ppm soil K
Yield response expected < 2.0% K of the CEC
From small-scale, test plot results ...
... to grower experimental adaptive use
LIMITED INTEREST: High Cost$ (w/ short supply) Slow operation (high volume) Specialized equipment
KCl fertilizer donated by Agriform & Tremont Group
I. Placement (of compost) II. Materials (compost vs. conventional fertilizer) III. Rates: potassium @ 50 100 200 400 lbs/acre
Research plans for 2015
Cooperators: Steve & Sam Meek & John Pon Colin, Frank & Louie Muller Bob & Bill Payne Dustin & Ron Timothy & Dave Viguie
Compost: UCD Russell Ranch
Research collaborators: Johan Leveau Nilesh Maharaj Karina Perez Hung Doan & many others