Research Update: Growing Almonds

85 Pages·2015·13.11 MB·English

by  Jenny Konschak

Research Update:
Growing Almonds
December 8, 2015
Speakers
Bob Curtis, Almond Board (Moderator)
David Smart, University of California, Davis
Alissa Kendall, University of California, Davis
Bruce Lampinen, University of California, Davis
Malli Aradhya, USDA-ARS, Davis, CA
Katherine Pope, UCCE – Yolo, Solano,
Sacramento Counties
Luke Milliron, University of California, Davis
Bob Curtis,
Almond Board
David Smart,
University of California, Davis
N O Emissions From Almond
2
David R. Smart, Sharon Dabach, Rebekah Davis, Maria del Mar Alsina and Daniel
Schellenberg
University of California, Davis
The Agriculture N Cycle: A balancing act.
N-Supply N-Demand N-Loss
Foliars Harvested nuts and
husks exported
Leaves and prunings
returned to orchard floor
-N
NH N O, N
3 2 2
NH + + NO -
Urea + NH + + NO - Organic-N 4 3
4 3
Optimize Synchronize Minimize
BMP Treatments:

Advanced Grower Practice (AGP)
(split applications targeted to N demand)

High Frequency Low [N] (HFLC)
(spoon feed, 20 split apps of 5-15 lbs acre-1)

Pump and Fertilize (P&F)
(AGP, compensating for well water N loads)
Spatially Modeling N O
2
Emissions

) 800
-1n B
mi
2 600
-m
s
ol Temporal Modeling and Integration
m 400
n
(
x
u 200
Fl -300
O -2 -1 0 1 2
2 Distance to water emitter (m)
N 0
300 (0,50) (0,0) (50,0)
y + y
o
Scaling to Seasonal N O:
2
Almond (lb/acre) Pistachio (lb/acre)
AGP HFLC P&F AGP HFLC P&F
Yield (kernels) 2699 2869 2695 2837 2869 2668
Groundwater-N 73.8 73.8 73.8 14.3 14.3 14.3
Fertilizer-N 215 215 186 174 166 161
Compost-N* 2 2 2 2 2 2
Kernel-N 119 130 112 79 80 75
Storage-N (wood) 25 25 25 25 25 25
N in Hulls 67 72 67 5 5 5
N O-N Loss 0.65 0.29 0.54 na na na
2
NUE 0.72 0.78 0.77 0.57 0.61 0.59