Precision nutrient management in wheat (Triticum aestivum) using Nutrient Expert®: Growth phenology, yield, nitrogen-use efficiency and profitability under eastern sub-Himalayan plains
2018
Mondal, Triptesh | Mitra, Biplab | Das, Saikat
A field experiment was conducted during the winter season (rabi) of 2014–15 and 2015–16 at Coochbehar, West Bengal, to assess the performance of Nutrient Expert® software on performance of wheat (Triticum aestivum L.) under both zero and conventional tillage. The experiment was designed in a split-plot design, with tillage options in main plot and nutrient management options in subplot. The treatment receiving 100% N-P-K through Nutrient Expert (NE) software resulted in higher plant height (90.2 cm) and leaf-area index (LAI) (4.70 at 90 days after sowing) with increased biomass (9.10 t/ha). As indicated from attainment of various phonological dates, it was revealed that the crop duration was drastically reduced due to shorter vegetative and reproductive phase under noor minimum nutrient-application treatment. Nutrient-management options also had a significant effect on the yield components of wheat, viz. spikes/m², grains/spike as well as 1, 000-seed weight. Treatment based on Nutrient Expert® produced significantly higher number of spikes/m² (382), grains/spike (55.7), spike length (11.25 cm) as well as 1, 000-seed weight (41.65 g) leading to the maximum yield (3.83 t/ha), 11% higher over recommended dose of nutrient application; thus, reflecting its superiority under both conventional and zero tillage. The NE-based recommendation indicated the superiority towards greater agronomic nitrogen-use efficiency (16.74 kg grain/kg N), economic nitrogen-use efficiency (2.11 kg grain/ invested in N) as well as benefit: cost ratio (1.57).
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