Relationship between malt qualities and beta-amylase activity and protein content as affected by timing of nitrogen fertilizer application.
- Author:
Jin-Xin CHEN
1
;
Fei DAI
;
Kang WEI
;
Guo-Ping ZHANG
Author Information
1. Department of Agronomy, Zhejiang University, Hangzhou 310029, China.
- Publication Type:Journal Article
- MeSH:
Agriculture;
methods;
Edible Grain;
chemistry;
drug effects;
metabolism;
Enzyme Activation;
Fertilizers;
Hordeum;
drug effects;
metabolism;
Nitrogen;
administration & dosage;
Plant Proteins;
metabolism;
Statistics as Topic;
Time Factors;
beta-Amylase;
chemistry;
metabolism
- From:
Journal of Zhejiang University. Science. B
2006;7(1):79-84
- CountryChina
- Language:English
-
Abstract:
The effects of different timing of N fertilizer application at the same rate on grain beta-amylase activity, protein concentration, weight and malt quality of barley were studied. Grain beta-amylase activity and protein concentration were significantly higher in treatments where all top-dressed N fertilizer was applied at booting stage only or equally applied at two-leaf stage and booting stage than in the treatment where all top-dressed N fertilizer was applied at two-leaf age stage only. On the other hand, grain weight and malt extract decreased with increased N application at booting stage. There were obvious differences between barley varieties and experimental years in the grain and malt quality response to the timing of N fertilizer application. It was found that grain protein concentration was significantly and positively correlated with beta-amylase activity, but significantly and negatively correlated with malt extract and Kolbach index. The effect of grain protein concentration on malt quality was predominant over the effect of grain beta-amylase activity.
