The Variation ofβ-glucan and Protein Content in Barley as Affected by Agronomic Practices

The influences of N applicationrate, timing, sowing date and seeding rate on β-glucan and protein content in barley grains were studied through the field experiments in Hangzhou, China during 1997 -2001. Protein content increased with N application rate and with N proportion applied at late stage. β-glucan content also responded significantly to N application rate and timing, but with different pattern with protein content. Of three N rate treatments, the medium N rate (135 kg ha-1) had the highest β-glucan content, being significantly higher than low N rate (90 kg ha-1) and no difference with high N rate (180 kg ha-1). Among three N timing treatments, two times of N top-dressing at both tillering and booting stage had significantly higher β- glucan content than once N top-dressing at tillering or booting stage. Sowing date has the dramatic effect on both β-glucan and protein content. Protein content decreased with the delayed sowing, and kernel weight showed opposite tendency. Either earlier or later sowing caused increased β- glucan content relative to sowing in early November, which is the normal date for barley sowing locally. Seeding rate had no significant influence on both β- glucan and protein content.

The Variation ofβ-glucan and Protein Content in Barley as Affected by Agronomic Practices

The influences of N applicationrate, timing, sowing date and seeding rate on β-glucan and protein content in barley grains were studied through the field experiments in Hangzhou, China during 1997 -2001. Protein content increased with N application rate and with N proportion applied at late stage. β-glucan content also responded significantly to N application rate and timing, but with different pattern with protein content. Of three N rate treatments, the medium N rate (135 kg ha-1) had the highest β-glucan content, being significantly higher than low N rate (90 kg ha-1) and no difference with high N rate (180 kg ha-1). Among three N timing treatments, two times of N top-dressing at both tillering and booting stage had significantly higher β- glucan content than once N top-dressing at tillering or booting stage. Sowing date has the dramatic effect on both β-glucan and protein content. Protein content decreased with the delayed sowing, and kernel weight showed opposite tendency. Either earlier or later sowing caused increased β- glucan content relative to sowing in early November, which is the normal date for barley sowing locally. Seeding rate had no significant influence on both β- glucan and protein content.