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Authors: 超级管理员 | Edit: xingqiang
This monitoring period is the growing season ofwinter wheat and the sowing season of spring crops. Compared to the thirteen-year average for the same period, rainfall and temperature were below average (-3% and -1.8°C), while PAR was near average (-0.5%). Rainfall was always below the five-year average in the southwest and west of the country,especially in the north of Texas and Oklahoma. Severe droughts happened in these regions and VHI sharply drops after mid- or late February. Maximum VCI in the south-eastern regions, such as Florida, Georgia, North Carolina, SouthCarolina and Alabama, was above average (in northern crop zones VCIx is notvery meaningful during the period covered). According to the NDVI profiles,about 40.2% of agricultural zones experienced conditions close to, but slightlybelow, average value; especially in the center and west regions, such as Texas and Oklahoma, crop growing condition was below the five-year average due to the drought in this monitoring period. Compared to the five-year average, nearly11.8 percent of crop areas enjoyed good growing condition, such as North Dakota, South Dakota, and Iowa. Another 11.7 percent of crop zones in the country showed worse growing condition, including the Great Lake area(Michigan, Indiana, Illinois and parts of Iowa) due to abnormal lower temperature and California due to severe droughts. Compared to previous years,the crop growing conditions in this monitoring period are slightly better than last year, but obviously lower than both the five-year maximum and five-year average. CropWatch estimates that winter wheat production in the United Statesis up 1.6% compared to last year's production (table B.1), resulting from very variable situations in the major producing states, including large decreases in California, Illinois, Michigan, and Texas and increases in N. and S. Dakota,Nebraska, and Montana, where temperature was close to average and rainfall abundant.
Figure 3.31. United States crop condition, Jan-Apr 2014
(a) Crop condition development graph based on NDVI (a) Maximum VCI
(c) Spatial NDVI patterns compared to 5YA (d) NDVI profile