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	Table 4. South Dakota spring wheat yield (Bu/Ac) and production estimates using NOAA AVHRR NDVI spectral regression method.

			WITHIN-YEAR					THREE YEARS
Year	ASD	Harvested Acres	Yield NASS	Yield NDVI	Production NDVI	Production NASS	NDVI- NASS Diff. %	Yield NDVI	Production NDVI	Diff. %
1989	10	178,000	18.2	18.5	3,297,700	3,243,900	1.8%	19.4	3,477,200	6.3%
	20	878,900	20.5	20.8	18,260,400	18,014,800	1.3%	23.1	20,345,100	12.9%
	30	530,500	27.9	25.0	13,244,300	14,786,300	-10.5%	30.2	16,015,900	8.3%
	40	41,900	12.3	11.7	488,900	516,400	-5.1%	7.8	328,400	-36.4%
	50	233,600	15.0	18.3	4,274,900	3,508,400	22.0%	19.0	4,435,000	26.4%
	60	141,500	29.7	24.7	3,499,000	4,197,700	-16.7%	29.8	4,215,300	0.4%
	70	2,100	15.0	13.8	28,900	31,500	-8.3%	11.3	23,800	-24.4%
	80	5,100	16.3	14.3	73,100	83,300	-12/1%	12.4	63,100	-24/3%
	90	38,400	18.7	21.9	842,200	717,700	17.3%	25.1	963,600	34.3%
SD		2,050,000	22.0	21.5	44,009,400	45,100,000	-2.4%	24.3	49,837,500	10.5%
1990	10	135,400	16.5	14.6	1,980,600	2,234,500	-11.3%	22.5	3,046,000	36.3%
	20	918,000	32.0	27.2	24,978,400	29,345,100	-15.0%	29.0	26,658,400	-9.2%
	30	609,000	39.4	35.7	21,733,500	24,000,400	-9.4%	33.4	20,370,100	-15.1%
	40	17,600	16.9	21.4	377,400	298,300	26/9%	26.0	458,300	53.6%
	50	258,200	27.8	25.4	6,559,300	7,177,900	-8.6%	28.1	7,255,600	1.1%
	60	124,000	25.9	32.1	3,984,900	3,217,500	24.1%	31.6	3,918,600	21.8%
	70	1,600	14.6	21.3	34,000	23,300	45.6%	25.9	41,500	78.0%
	80	7,700	25.4	26.1	200,800	195,300	2.7%	28.5	219,100	12.0%
	90	28,500	24.8	24.5	698,700	707,700	-23.4%	27.6	787,700	11.3%
SD		2,100,000	32.0	28.8	60,547,000	67,200,000	-9.9%	29.9	62,755,300	-6.6%
1992	10	244,000	25.0	24.6	6,002,200	6,108,900	-1.6%	21.9	5,331,600	-12.7%
	20	1,020,000	34.9	33.3	33,959,200	35,648,300	-4.6%	29.6	30,208,500	-15.3%
	30	553,000	40.6	39.1	21,596,600	22,472,000	-3.8%	34.8	19,222,800	-14.5%
	40	76,000	27.4	25.1	1,908,200	2,084,000	-8.4%	22.3	1,695,200	-18.7%
	50	377,000	28.3	32.0	12,079,300	10,650,700	13.2%	28.5	10,743,500	0.9%
	60	120,000	38.0	39.0	4,682,600	4,564,000	2.7%	34.7	4,167,900	-8.7%
	70	6,000	26.9	27.2	163,500	161,500	1.3%	24.2	145,300	-10.0%
	80	58,000	27.8	29.8	1,727,000	1,611,300	7.1%	26.5	1,535,500	-4.7%
	90	46,000	36.9	33.7	1,552,200	1,699,300	-8.6%	26.5	1,380,800	-18.7%
SD		2,500,000	34.0	33.5	83,670,800	85,000,000	-1.6%	29.8	74,431,100

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Hydrology and Remote Sensing Laboratory: Beltsville, MD