2024, Vol. 7, Special Issue 10

author(s)
VK Veerendra Kumar, Ananda N, Kamble Anand Shankar, Krishnamurthy D and Mukesh Kumar Meena

abstract
A field experiment was conducted at MARS, UAS, Raichur during Rabi, 2023-24 to study the nitrogen management in linseed (Linum usitatissimum L.) through nano urea. The experiment was laid out in split plot design consisting of four main plots consisting recommended dose of nitrogen levels i.e., 100%, 75%, 50% and 25% and five sub plots involving nano urea and conventional urea levels i.e., no spray of nano urea, one spray of nano urea @ 3 ml l^-1 at flower initiation, two sprays of nano urea @ 3 ml l^-1 at flower initiation stage and capsule development stage, one spray of 2% urea at flower initiation stage, two sprays of 2% urea at flower initiation stage and capsule development stage each were replicated thrice. The results of the experiment indicated that the application of 100% RDN recorded the higher seed yield (914 kg ha^-1), straw yield (1731 kg ha^-1), harvest index (35%), higher gross returns (Rs. 45,684 ha^-1), net returns (Rs. 29,863 ha^-1) and B:C (2.89).With respect to nano urea levels, two sprays of nano urea @ 3 ml l^-1 at flower initiation stage and capsule development stage recorded significantly higher seed yield (Rs. 838 kg ha^-1), straw yield (1669 kg ha^-1), harvest index (33%), gross returns (Rs. 41,925 ha^-1) net returns (Rs. 25,894 ha^-1) and B:C (2.60). Among interaction effects, application of 100% RDN + two sprays of nano urea @ 3 ml l^-1 at flower initiation stage and capsule development stage recorded significantly higher seed yield (984 kg ha^-1), straw yield (1827 kg ha^-1), harvest index (36%), gross returns (Rs. 49,184 ha^-1), net returns (Rs. 32,267 ha^-1) and B:C (2.91). Application of 100% RDN (50% basal + 50% top dressing) along with foliar application of nano urea @ 3 ml 1^-1 at flower initiation and capsule development stage or foliar application of urea @ 2% at flower initiation and capsule development stage was found beneficial in getting the higher seed yield, net returns and benefit cost ratio.