[N-use efficiency, N assimilation, and morphophysiological traits in barley]
1989
Sairam, R.K. | Singh, K.K. (Indian Agricultural Research Inst., Karnal (India). Regional Centre)
An experiment was conducted at the Research Farm of IARI, Regional Centre, Karnal in India to study the variability in production efficiency and nitrate reductase activity and their relationship with grain yield and yield-related attributes. The material tested comprised of 98 barley genotypes planted in two 1-m rows spaced 20 cm apart. Sowing was done in a split plot design with three replications. The main plot treatments consisted of two nitrogen levels: 0 and 80 kg N/ha. Nitrogen was applied in two split doses, half before planting and the remaining half after the first irrigation. Significant phenotypic differences were found in all the measured traits. Grain yield varied from 0.43 kg/plot for karan 903 to 0.92 for Karan 906. Nitrate reductase activity was highest in Karan 906 and Karan 916. Karan 906 and Karan 916 had the highest N-use efficiency. Grain yield was positively correlated with tiller number, ear length, grain number/ear, 1000-grain weight, biomass, harvest index, N-use efficiency, N uptake, and nitrate reductase activity at both genotypic and phenotypic levels. Biomass and harvest index had the maximum effect on grain yield
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