Based on data from statistical yearbooks, the minimum, maximum, median, and mean values of the annual average wheat yield in Dingxing County from 1993 to 2010 are 350, 420, 389, and 386 kg, respectively.
In China (Mainland), the subregion's main producer, prices of wheat and wheat flour were stable in most markets in February and were generally down from a year earlier on account of adequate supplies from the 2018 average wheat harvest and large carryover stocks.
Wheat starch is equally suitable for ethanol production, and three large facilities that have already opened or are in development in the UK, for example, will have the capacity between them to use 2.8 mt of wheat grain per annum, representing 19% of the UK's average wheat harvest.
The null hypothesis is that average wheat yield has remained constant over the sample period.
In 1997-99, for example, the top performing 10percentt had average wheat yields more than six times higher that those of the worst performing 10percentt and twice as high as the average in the largest producers, China, India and Turkey.
The net effect would be an increase in average wheat yields of 15 23% by the middle of the century.
Based on average annual US Gulf Port fob prices, the international price of wheat relative to maize fell by 7percentt between 1996/97 and 1998/99 1/, affecting the mix of grains used for feed in the Republic of Korea; compared to 1995/96, average wheat feed usage rose by some 900 000 tonnes in the 1996/97-1998/99 period, while coarse grain feed use declined by 1.6 million tonnes.
The average annual wheat yield has increased from 49 bushels/acre during 1989-1993 to 64 bushels/acre during 2009-2013.
Between 1981 and 2002, the average global wheat yield decreased by 88 kg/ha.
In the period of 2003 to 2008, the average winter wheat yield south of Hanover was always above 8 t/ha, above 7 t/ha south of Oldenburg and generally below 7 t/ha in the north-east.
