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Efficacy of Potassium Humate and Chemical Fertilizers on Yield and Nutrient Availability Patterns in Soil at Different Growth Stages of Rice
- Kumar, Dileep, Singh, A. P.
- Communications in soil science and plant analysis 2017 v.48 no.3 pp. 245-261
- crop production, developmental stages, mineral fertilizers, nitrogen, nutrient availability, phosphorus, potassium, rice, soil, sulfur, zinc, zinc sulfate
- Potassium humate (PH) is a promising natural resource to be utilized as an alternative for increasing crop production. A pot experiment was conducted during 2009 and 2010 to assess the efficacy of application of potassium humate (0, 5, and 10 mg kg ⁻¹ soil) alone and in combination with chemical fertilizers (75% and 100% recommended dose of nitrogen–phosphorus–potassium) on yield and nutrient availability patterns in soil at different growth stages of rice. Two doses of zinc, viz. 0 and 12.5 mg kg ⁻¹, were also applied. Sole and combined application of potassium humate with nitrogen–phosphorus–potassium (NPK) and zinc significantly (p < 0.05) improved the yield and availability of nitrogen, phosphorus, potassium, sulfur, zinc, and dehydrogenase activity in soil. Application of 10 mg kg ⁻¹ potassium humate along with 100% NPK and 12.5 mg kg ⁻¹ zinc sulfate proved significantly superior when compared to 75% and 100% of NPK alone.