Centre county Pennsylvania, USA | USDA (NASS) defines each crop condition category in terms of normal yield.
Excellent -------- above normal yield
Good ------------- normal yield
Fair -------------- below normal yield
poor ------------- much below normal yield (heavy degree of loss of yield potential)
Very Poor: ------- very much below normal yield (complete or near crop failure)
However; NASS does not define normal yield. Perhaps someone could estimate yield from crop condition by assuming that normal yield means trend yield for the crop year? FWIW, 2015 trend yield, computed from 45 years of NASS reported US corn yield data, is 161.9.
Here is a copy/paste from NASS that defines General Crop Condition:
"General Crop Condition:
Very Poor - Extreme degree of loss to yield potential, complete or near crop failure. Pastures provide very little or no feed considering the time of year. Supplemental feeding is required to maintain livestock condition.
Poor - Heavy degree of loss to yield potential which can be caused by excess soil moisture, drought, disease, etc. Pastures are providing only marginal feed for the current time of year. Some supplemental feeding is required to maintain livestock condition.
Fair - Less than normal crop condition. Yield loss is a possibility but the extent is unknown. Pastures are providing generally adequate feed but still less than normal for the time of year.
Good - Yield prospects are normal. Moisture levels are adequate and disease, insect damage, and weed pressures are minor. Pastures are providing adequate feed supplies for the current time of year.
Excellent - Yield prospects are above normal. Crops are experiencing little or no stress. Disease, insect damage, and weed pressures are insignificant. Pastures are supplying feed in excess of what is normally expected at the current time of year." |
Help with assessing crop conditions, please?
