QID Form C-2 - Winter Wheat Yield Survey - National Laborato

Project Code 101

OMB No. 0535-0088: Approval Expires 3/31/2023

NATIONAL
AGRICULTURAL
STATISTICS
SERVICE

FORM C–2 WINTER WHEAT YIELD SURVEY
NATIONAL LABORATORY DETERMINATIONS
2022

Date sample received in lab:

1. From Identification Tag

UNIT 1

UNIT 2
501

a. All Heads (Emerged, Late Boot, and Detached)............
Number

Total Number

b. Stage of maturity............................................................
Code

Unit 1 code

502

2. Laboratory Determinations, All Clipped Heads from Units 1 and 2
a. Unit 1:
i.

Heads in sample 1/(Initial if recounted__________)......................................................
Number

ii. Total weight of heads.....................................................................................................
Grams

504
503

. __ __

b. Unit 2:
Heads in Sample 1/(Initial if recounted__________) .....................................................
Number

506

ii. Total weight of all heads................................................................................................
Grams

505

i.

c. Total weight of all heads 2a(ii) + 2b(ii)............................................................
Grams

. ___ ___

.__ __

3. Threshed Grain, All Heads from Units 1 and 2
a. Weight immediately after threshing......................................................................................
Grams
i.

Is item 3a LESS than 2c?

Yes - Go to item 3b

507

No- STOP - NOTIFY SUPERVISOR

b. Weight immediately before moisture test.............................................................................
Grams

508

c. Moisture content 2/................................................................................................................
Percent

509

4. Approximate density of the sample......................................................................................
Pounds/Bushel (One Decimal)

510

Lab Technician:

.__ __

.__ __
.__
. __

Date Analyzed:
MM DD

1/ If

2/ If

the Lab count is different from the field count, follow these steps -a.

Check if the correct unit was counted.

b.

RE-ADD counts from the ID tag.

c.

If counts are different by 5% or more (lab count/ field count) then recount heads and initial unit recounted. Lab
supervisor, notify State when difference 5% or more.

the sample weight is too small or too dry for a moisture test, follow the procedures on the back of this form to complete the Moisture
Test.

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FORM C-2: WHEAT

If the sample weight is too small for moisture test, sufficient grains of known moisture content
(use same class and stage of maturity) will be added to the sample so that a moisture test
can be made. The moisture content of the sample can then be derived using the following formula:

E=

( A + B ) D - ( B x C)
A

Where A = Weight of small sample....................................................................................................

. __ __

Grams

B = Weight of additional grain required for moisture test..........................................................

. __ __

Grams

C = Moisture percent of B.........................................................................................................

. __

Percent

D = Moisture percent of A + B combined..................................................................................

. __

Percent

E = Result: Moisture percent of small sample (enter in item 3c)..............................................

. __

Percent