Vol. 7, Issue 2 (2018)
Effect of potassium management on yield, nutrient uptake and storability of kharif onion (Allium cepa L.) and residual fertility of soil under the Alluvial Zone of Bihar
Author(s): Mukta Rani and AK Jha
Abstract: Due to increasing population, industrialization and urbanization, a fundamental shift has been taken place in food production and agricultural research. Today, the drive for productivity is increasingly combined with a desire for sustainability and to be sustainable in the long term, it will be necessary to replenish the reserves of nutrients which are removed or lost from the soil. A field experiment was carried out at vegetable farm of Bihar Agricultural University, sabour, Bhagalpur in sandy loam soil during kharif 2016-17 with kharif onion cv. Agrifound Dark Red using Azolla and vermicompost for sustainable crop production and soil health management. The experiment comprised of 8 treatments viz. T1 (no K application), T2 (50 per cent RDK), T3 (100 per cent RDK), T4 (50 per cent RDK + 50 per cent K by Azolla), T5 (50 per cent RDK + 50 per cent K by Vermicompost), T6 (50 per cent RDK + 25 per cent K by Azolla + 25 per cent K by Vermicompost), T7 (100 per cent K by Azolla) and T8 (100 per cent K by Vermicompost). Full dose of N and P were applied in all the treatments through urea and SSP respectively. However, potassium was supplied through muriate of potash (MOP) having 60 per cent K2O, vermicompost (0.8 per cent potassium) and Azolla (2.62 per cent potassium on dry wt. basis). Results from field experiment showed that the treatment T5 resulted in the highest bulb yield (13.17 t ha-1) which was 16.24 and 41.46 per cent higher as compared to that recorded with T3 and T1 respectively. The highest uptake of N (58.40 kg ha-1) was recorded with treatment T7. However, phosphorus uptake was found to be the highest (12.14 kg ha-1) with treatment T8. Treatment T6 had uptake the highest amount of potassium (65.29 kg ha-1). The plots which were not treated with potassium showed lowest N, P and K uptake (30.29 kg ha-1, 5.82 kg ha-1, 27.46 kg ha-1 respectively) by onion crops. Treatment T7 increased the storability by 20.33 per cent over T3 and 29.76 per cent over control after 60 days of storage. Treatment T4 showed the highest available N content (287.80 kg ha-1) in residual soil. Available phosphorus content in residual soil was highest in treatment T5 (33.46 kg ha-1). The highest available potassium content (259.27 kg ha-1) in residual soil was observed in treatment T4. However, the lowest value (208.08 kg ha-1) of available K was recorded in control plot. The study indicated that the application of Azolla and vermicompost alone or in combination resulted in higher bulb yield, nutrient uptake and found to be beneficial for improving fertility of the soil.
How to cite this article:
Mukta Rani and AK Jha. Effect of potassium management on yield, nutrient uptake and storability of kharif onion (Allium cepa L.) and residual fertility of soil under the Alluvial Zone of Bihar. Journal of Pharmacognosy and Phytochemistry. 2018; 7(2): 377-382.