Effect of land configuration, irrigation regimes and nitrogen application on growth, yield and quality of Japanese mint (Mentha arvensis)

摘要

An experiment was conducted during summer season of 2016-17 at the Narendra Deva University of Agriculture and Technology, Faizabad, Uttar Pradesh, to study the effect of land configuration, irrigation regimes and nitrogen application on growth, yieldand quality of Japanese mint (Mentha arvensis). The treatments consisted of 3 land configurations (flat-bed planting, ridge planting and raised-bed planting), 3 irrigation regimes 0.8 irrigation water: cumulative pan evaporation (IW: CPE), 1.0 IW: CPE and 1.2 IW: CPE ratio) and 3 nitrogen levels recommended dose of nitrogen (RDN) 160 kg N/ha, 75 RDN (120 kg N/ha) and 125 RDN (200 kg N/ha) in a splitplot design with 3 replications. Raised-bed planting recorded the maximum leaves/plant (188.8), plant fresh weight (1868 g/m2), leaf: stem ratio (1.84), herbage (1.80 t/ha) and oil yield (136.5 lit./ha) than the ridge and flat-bed planting. Irrigating the crop at an IW: CPE ratio of 1.2 resulted in the highest growth parameters, herb (1.71 t/ha) and oil yield (130.1 lit./ha) and quality parameters over other irrigation regimes. Significantly the maximum crop growth leaves/plant (189.8), plant fresh weight (1784 g/m2), leaf: stem ratio (1.77), herbage (1.71 t/ha) and oil yield (131.9 lit./ha); and quality parameters carotenoid content (2.66 mg/g fresh weight), menthone content (6.23), menthol content (72.0) and oil content (0.77) were recorded with the application of 125 RDN over 75 RDN and it was at par with 100 RDN. This study indicated that planting on raised bed, irrigation at 1.2 IW: CPE ratio and the application of 125 RDN (200 kg N/ha) gave higher yield and quality of Japanese mint.