After evaluating 300 collections, the best 20 based on grain yield and seed quality were selected in 1989.

Over the past 50 years, world population has doubled, grain yields have tripled and economic output has grown sevenfold.

Over the past few decades, major increases in grain yield have come largely through increasing planting densities.

Increasing seed size is one way to increase grain yield.

Not only do the harvests get affected, the grain yield is also predicted to decrease anywhere from 3 to 15 percent.

In rice, a few studies also indicated that this mechanism maintains grain yield under water stress at the grain filling stage.

Starch content (amylose) of rice is very important factors in grain yield, processing and palatability.

In the United States the grain yield is typically reported as bushels per acre.

When adjusted for weather variations, grain yields rose sharply during the Gorbachev years; the output of 240 million tons this year was the highest ever.

Most of the money will go to farmers whose grain yields declined by at least 35 percent.