Farmers can directly measure the intensity of a drought by checking their soils, plants, and rain gauges. In contrast, meteorologists, economists, and policymakers generally use a drought index to assess drought over a wider area. The most commonly used index is the Palmer Modified Drought Index ...
2. Pretty neat pecan: a new pecan variety developed by USDA-ARS targets growers in the Southeast [J] . Lisa Heacox Western Fruit Grower . 2002,第3期 机译:漂亮的山核桃:USDA-ARS开发的一种新的山核桃,主要针对东南部的种植者 3. Advancing DNA fingerprint system in pecan:National pecan res...