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Subject: Agronomy × Author: Gangmei, Tigangam P × End date: 2022 × Start date: 2020 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Effect of nutrient management and irrigation scheduling on crop and water productivity of rice wheat cropping system
    (palampur, 2022-08-25) Gangmei, Tigangam P; Kumar, Anil
    The field experiment was conducted at Water Management Farm of CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur during kharif 2018 to rabi 2019-20 to evaluate the effect of irrigation scheduling and nutrient management practices on crop and water productivity and soil health parameters in direct seeded rice-wheat cropping sequence. The soil of the experimental field was silty clay loam in texture, acidic in reaction, medium in organic carbon, medium in available nitrogen and potassium and high in phosphorus content. The experiment was laid out in split plot design with three irrigation schedules {irrigation at critical stages (I1), 0.6 CPE (wheat)/ 0.8 (rice) CPE (I2) and 1.0 CPE (I3)} in main plot and four nutrient management practices {inorganic nutrient management (F1), organic nutrient management (F2), natural farming management (F3), integrated nutrient management (F4)} in subplots, replicated thrice. Better root growth, higher yield attributes, crop and water productivity, nutrient uptake and net returns in rice were obtained when the crop was irrigated at critical stages and integrated nutrient management practice was used. Whereas for wheat crop, irrigation scheduled at 1.0 CPE and integrated nutrient management was found best for all the parameters. The flowering and maturity got delayed under natural farming whereas lesser number of days was taken for these phenophases when integrated nutrient management practice was followed. Higher iron, zinc and protein content in rice and protein content in wheat were recorded under integrated nutrient management. Crop quality parameters amylose in rice and gluten in wheat with lower values were better under natural farming practice. Higher soil pH, water holding capacity and lower bulk density was observed under integrated nutrient management. All the other nutrient management practices except inorganic nutrient management practice recorded a buildup of available nutrient content at the end of 2 year cropping system. Thus for higher crop and water productivity, crop quality and better soil health under direct seeded rice-wheat cropping sequence, the rice crop should be irrigated at critical stages whereas wheat should be irrigated at 1.0 CPE schedule; and in both crops, the integrated nutrient management practice should be followed.