Grain can be traded in the futures market before harvesting. If grain production is predicted to be insufficient, grain futures prices will rise; if grain harvests are predicted, grain futures prices will fall. This morning, meteorologists predicted that from tomorrow there will be much-needed rainfall in the grain-producing areas. 
The price of grain futures fluctuated more sharply in this quarter than in the last quarter
 since sufficient moisture is very important to the survival of current grains, the price of grain futures today will fall sharply.