Harvest Index???

Freddie Lamm FLamm at oznet.ksu.edu
Fri Feb 20 17:14:08 EST 1998


I wasn't in the original harvest index discussion, but is harvest
index the same thing as harvest index ratio???  If not please let me
know.

Donald and Hamblin (1976) define HIr as

HIr = (EY(1-WC))/DM

where EY is economic yield, WC is water content wet basis and DM is
aerial Dry matter.    I would think HIr would increase if EY
increases as it has over the last ?? years.  Yes DM includes EY, but
as an example (numbers may not be right)

EY = 100 at time 1
DM= 150 at time 1

EY = 200 at time 2
DM= 250 at time 2 if plants aren't larger vegetatively

200/250 is a greater percentage than 100/150.

In respect to original question about converting pounds to bushel, I
don't see why HI is a part.   56 lbs/bu at 15.5 moisture wet basis
should be extent of answer.

Donald and Hamblin (1976)  in Advances in Agronomy 28:361-405

Freddie
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