Managing Lodging Risk In Winter Wheat-Books Download

Managing Lodging Risk in Winter Wheat

2020 | 2 views | 20 Pages | 2.52 MB

wheat canopy from a digital photograph of the crop. At GS 30, it has been shown that each 0.5 unit increase in GAI above a GAI of 1.25 effectively reduces the variety Lodging Resistance Score, described in the HGCA Recommended List, by 1 point. At GS 31, the critical GAI above which lodging risk increases is 1.75.



Introduction
www pgrplus basf com
is BASF s new website tailored to managing
lodging risk in cereals
I n addition to detailed information about BASF plant growth
regulators the website also hosts a new innovative tool for the
assessment of lodging risk in wheat
sing the CAT Canopy Assessment Tool you can quickly and
very easily obtain a lodging risk assessment of your wheat
crop and a simple yet tailored PGR recommendation
he information provided is also important for estimating the
fertiliser requirement of the crop when using methods such as
the RB209 Fertiliser Guide and GrowHow s N Calc System
AT has been developed trialled and calibrated by ADAS in
order to provide an accurate lodging risk assessment and PGR
programme according to the in field risk
Canopy Assessment Tool
o what is the theory
The size of the wheat canopy in the spring
time is a critical indicator for decisions about
nitrogen and plant growth regulators PGRs
ize of the wheat canopy is difficult to estimate but it can be
measured by its Green Area Index GAI the amount of green
tissue per m2 of ground
he Canopy Assessment Tool CAT estimates the GAI of the
wheat canopy from a digital photograph of the crop
t GS 30 it has been shown that each 0 5 unit increase in GAI
above a GAI of 1 25 effectively reduces the variety Lodging
Resistance Score described in the HGCA Recommended List
by 1 point At GS 31 the critical GAI above which lodging risk
increases is 1 75
igher yielding crops have a greater lodging risk as a result
of heavier ears It has been estimated that each tonne per
hectare increase in yield above 9 t ha reduces the variety
Lodging Resistance Score by 0 5 points
nowing the GAI at growth stage 30 or 31 together with the
Lodging Resistance Score of the variety and an estimate of the
crop s yield potential allows the lodging risk to be predicted
and the subsequent requirement for a PGR or PGR programme
ach unit of GAI is equivalent to a crop N content of 30 kgN ha
Knowledge of how much N a crop has taken up in the spring is
required to estimate the N fertiliser requirement of crops
Growth Stage Guide
How do I know when my crop is
at GS 30 or GS 31
Growth stage 30
The beginning of stem elongation pseudostem and tillers erect
First internode begins to elongate top of inflorescence at least
1 cm above tillering node
1cm 1cm 1cm 1cm
Distance between base of the plant and the top of the shoot
apex on the main stem is 1cm or more but the length of the 1st
internode is less than 1cm
Growth Stage Guide
Growth stage 31
First node at least 1 cm above tillering node
First node detectable GS 31
main shoots split
An internode of 1cm or more is present but the internode above
is less than 2cm
Growth Stage Guide
Growth stage 32
Node 2 at least 2 cm above node 1
Second node detectable GS 32
main shoots split
2nd node than
Second and subsequent nodes are counted when the internode
below them exceeds 2cm
Advantages and benefits of using CAT
Tailored PGR programmes
justification ICM
Support tool to calculate
crop nitrogen requirement
Quick and easy to use
Guidance on using the Canopy
Assessment Tool CAT
S useo how
Step 1 Take a quick CAT scan
From growth stage 30 up to and including GS 31 take a digital
photo of the crop which is representative of the field
Note To gain the most accurate results from the tool digital
photographs should be taken directly above the crop The area
of crop photographed is not critical and a 1m x 1m is perfectly
adequate It is advisable to avoid taking photographs on sunny
days as this may cause shadows
Quality of the camera is less important A camera phone is
perfectly adequate
Step 2 Upload the photo
Go to www pgrplus basf com and upload the digital photo to
Step 3 Wait for the advice
Enter the wheat variety predicted yield date and
geographical area
The CAT will show
The Green Area Index GAI of your crop
Resistance to lodging score of your crop 1 9 scale where
1 is high lodging risk
A BASF PGR programme tailored to that field risk at the time of
taking the photograph
Risk colour Red high risk Yellow medium risk
Green low risk
Calculated crop N content in kg ha
Photographs of various GAI scores at
crop Growth Stage 30
Photographs of various GAI scores at
crop Growth Stage 30
Photographs of various GAI scores at
crop Growth Stage 30
Photographs of various GAI scores at
crop Growth Stage 31
Photographs of various GAI scores at
crop Growth Stage 31
Photographs of various GAI scores at
crop Growth Stage 31


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