Response of Bt cotton (Gossypium hirsutum L.) to the foliar spray of nutrients
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Date
2023-01
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CCSHAU, Hisar
Abstract
The present investigation entitled “Response of Bt cotton (Gossypium hirsutum L.) to the foliar spray of nutrients” was carried out during crop season kharif 2021-22 at Cotton Research Area of Chaudhary Charan Singh Haryana Agricultural University, Hisar. The experiment was laid out in Randomized Block Design replicated thrice with eight treatments of foliar application of nutrients viz. T1: Control, T2:MgSO4 (0.5%), T3:ZnSO4 (0.5%), T4:FeSO4 (0.5%), T5: Borax (0.5%), T6:ZnSO4 (0.5%) +Urea (2%), T7: DAP (1%), T8: Urea (2%) applied at 60, 75, 90 DAS. The results revealed that days to 50 % flowering were significantly less in T8 which was at par with treatment T3, T5, T6 and T7, while treatment T5 recorded lowest number of days to 50% boll formation. Plant height at 75, 105, 135 DAS and harvest was recorded significantly higher in treatment T2 which was at par with T6. At 75 DAS, treatment T3 being at par with T2 and T5 resulted in significantly higher dry matter accumulation than rest all foliar sprays of nutrients. At 105 and 135 DAS treatment T6 being at par with T2,T3,T4 and T5 recorded significantly higher dry matter accumulation than rest all foliar sprays of nutrients. At harvest treatment T2 being at par with T3,T4,T5, T6 T7 and T8 recorded significantly higher dry matter accumulation than control treatment while T6 being at par with T2,T3 , T5 and T8 produced significantly more number of bolls per plant (45) than T1, T4 andT7 .Highest seed cotton yield was recorded in treatment T6(ZnSO4 (0.5%) +Urea (2%) which was significantly superior to T4 and T1 (Control) but at par with rest all treatments (T2, T3, T4, T5, T7 and T8). Boll weight (g) of Bt cottonwas highest in treatment T2 which differ significantly over other treatments except T5, T6, T7 and T8. Highest seed index (8.98 g) was recorded in treatment T7 followed by T8 (8.74 g) and T6 (8.73 g). (T6) being at par with T5 and T8 produced significantly higher value of ginning out turn (38.9%) than rest all treatments. Highest net returns were found with the treatment T2. The B:C was highest (2.47) in T2. The highest gross returns were found with the treatment T6