Irrigation Regimes and Soil Amendments Response on Water Productivity, Soil Properties and Rice Yield
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Date
2021-12
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
A pot experiment was conductedduring Kharif of 2020,at the Division of Soil Science and Agriculture Chemistry to study the effect of differentsoil amendments(biochar and polymer)on soil properties, growth, yield and water productivity of rice (Basmati-370). The experiment was laid out in 2-factorial CRD with three replications comprising two levels of irrigation viz. I1 (continuously flooded upto 5 cm) and I2 (water deficit) as one factor-I and soil amendments (biochar and PAM alone, as well as in combination with each other, 100 % RDF and control) as factor-II. The soil was sandy clay loam in texture, mildly alkaline in reaction, EC within a safe limits, with a low organic carbon, low available nitrogen, medium phosphorus and potassium.
Among the irrigation regimes, continuous flooding proved superior to water deficit irrigation regimes and obtained higher values of growth parameters, grain and biological yield. Increase in almost all the growth parameters resulted in significant improvement in yield attributes which led to the significantly highest grain yield. Sole or combined application of soil amendments (biochar and polymer) along with 100 % RDF through inorganic fertilizers performed better than 100 % RDF alone in terms of shoot and root parameters, crop yield and improvement of soil properties. Treatment B10 PAM10 (10 tons biochar per hectare + 10 kg polyacrylamide per hectare) proved to be a promising combination and recorded significantly higher values for growth parameters, yield attributes, nutrient uptake compared to other treatments. Among the interactive effect of irrigation regimes and soil amendments, conjuctive use of biochar and polymer (B10 PAM10) under water deficit condition improved soil and plant parameters, grain yield and water productivity.
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