Vol. 11, Issue 9 (2022)

Author(s):
NB Gohil, DP Patel and NK Gajre

Abstract:
Pot experiment was conducted to investigation the effect of soil application of iron (Fe) and zinc (Zn) on available nutrients in soil under two rice varieties at Department of Natural Resources Management, ASPEE College of Horticulture and Forestry, NAU, Navsari. The experiment consists of two varieties of Rice i.e. GNR-4 and RP BIO 5477-NH787 (IET- 23833) and nine level of micronutrients i.e. Fe @ 2.50 mg kg^-1, Fe @ 5.00 mg kg^-1, Fe @ 7.50 mg kg^-1, Fe @ 10.0 mg kg^-1, Zn @ 1.25 mg kg^-1, Zn @ 2.50 mg kg^-1, Zn @ 3.75 mg kg^-1, Zn @ 5.00 mg kg^-1, Micronutrient fertilizer Grade 5 @ 12.0 mg kg^-1in FCRD with three replication. The experimental results revealed that significantly more available K₂O (337.5 kg ha^-1) and Fe (5.26 mg kg^-1) were registered with variety V₂ (IET-23833) than in V₁ (GNR-4) plots. Exactly reverse trend was observed for available Zn content (0.76 mg/kg) in soil. Among the different micronutrient levels, the available P₂O₅ content in soil after harvest of rice was found to decrease remarkably as the rate of Fe (M₁- 2.50 mg Fe kg^-1 to M₄- 10.0 mg Fe kg^-1) and Zn (M₅- 1.25 mg Zn kg^-1 to M₈- 5.00 mg Zn kg^-1) applications increased and significantly lower available P₂O₅ content was recorded with M₄ and M₈ as compared to control (M₀). The availability of Fe was found to increase significantly with each level increase in Fe application (M₀ to M₄). The same trend was also recorded for Zn availability under the treatments receiving Zn at different rates (M₅ to M₈). In addition to this, the Mn availability was also improved significantly with the application of both Fe (M₄) and Zn (M₈) at higher levels.