Influence of Sulphur, Zinc and Boron on Uptake and Availability of Nutrients in Onion

Abstract:

A field experiment was conducted at Gotur village of Kalagi taluka in Kalaburagi district of North Eastern Dry Zone (Zone-2) of Karnataka to study the influence of sulphur, zinc and boron on uptake and availability of nutrients in onion. The experiment contains the ten treatments which were laid out in randomized complete block design with three replications. The results revealed that application of Sulphur @ 30 kg ha-1 + Zinc @ 2 kg ha-1 + Boron @ 1.5 kg ha-1 along with recommended dose of fertilizers recorded the significantly highest nitrogen uptake in leaves (76.97 kg ha-1) and bulbs (106.08 kg ha-1), phosphorus uptake in leaves (10.27 kg ha-1) and bulbs (16.18 kg ha-1), potassium uptake in leaves (66.03 kg ha-1) and bulbs (92.14 kg ha-1) and sulphur uptake in leaves (17.79 kg ha-1) and bulbs (26.52 kg ha-1), DTPA extractable Zn uptake in leaves (136.74 g ha-1) and bulbs (207.31 g ha-1), boron uptake in leaves (101.84 g ha-1) and bulbs (145.86 g ha-1). The available nitrogen (224.71kg ha-1), phosphorus (37.48 kg ha-1), potassium (351.37 kg ha-1), available sulphur (21.05 kg ha-1), DTPA extractable zinc (1.33 mg kg-1) and available boron (1.41 mg kg-1) content of soil were also significantly highest in that treatment.