Performance of amaranthus genotypes for growth and yield under different nitrogen levels

Present investigation was undertaken to assess the stability of 20 amaranthus genotypes under varying levels of nitrogen. Nitrogen levels, i.e., 75, 100 and 125 kg N/ha were kept in main plots, while the genotypes were evaluated in sub-plots. The stability of these genotypes was measured by three parameters, viz., mean performance over different nitrogen levels, the linear regression and deviation from regression. The linear increase in the total green yield of amaranthus was evident with every increase in dose of nitrogen, where maximum yield of 279.76 q/ha was recorded with 125 kg N/ha against 174.06 q/ha with the application of nitrogen @ 75 kg N/ha. The application of nitrogen at the level up to 125 kg per hectare can be recommended to get high total green yield. The genotypes Local Thundukeerai and Selection-1 were high yielding and stable under varying N levels, whereas, the genotypes CO-5 and CO-2 were highly responsive to nitrogen application. Genotypes, namely, Local Thundukeerai, Selection-1, CO-5 and CO-2 can be exploited as potential genotypes for getting higher yield.