Aspect of wheat grain quality in Tokachi district in Hokkaido
2006
Nakatsu, S.(Hokkaido. Tokachi Agricultural Experiment Station, Memuro (Japan)) | Matsunaga, H. | Sawaguchi, A.
Grain quality (volume weight, alpha-amylase activity, protein content and ash content) was investigated on 1 28 winter wheat samples, Hokushin variety, collected in central Tokachi region from 2002 to 2004. There was no significant relationship between the grain quality and grain yield, or among the grain quality components. Volume weight showed a relatively high correlation with gram weight (r=0.67**-0.91**) and the percentage of whole gram (r=0.65**-0.90**) in each year. The mean grain weight was higher the lower the temperature in the ripening period; 2003 2002 2004. The mean volume weight in 2003 was also higher than that in 2002 and 2004. The activity of alpha-amylase was low in all three years examined because of the limited precipitation just before the maturing stage. The mean protein content in 2002 and 2004 was 10.2 and 10.3%, respectively, which were appropriate values, but was 9.4% in 2003, which was unfavorably low. The protein content of the grain showed a relatively high correlation with nitrogen and potassium contents of wheat straw (r=0.55**-0.80**). The mean ash content in 2003 and 2004 was 1.44 and 1.53%, respectively Phosphorus and potassium accounted for about 40% of the ash content. The ash content of grain was highly correlated with the phosphorus content (r=0.92**-0.96**).
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