2 research outputs found
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Not AvailableCommon abiotic stresses in rain-fed rice areas like drought can occur at any
phase of crop growth and may occur periodically. Variation in intensity and
severity of drought requires the use of different rice varieties and different
nutrient management strategies. This study evaluated the morphological
and physiological response of contrasting rice cultivars (Rajalaxmi, IR64, and
Sahbhagidhan) to various nutrient combinations under water sufficience
and scarce conditions. Drought stress at vegetative stage significantly
reduced tiller formation, dry matter remobilization, and photosynthesis,
leading to around 41.6% yield reduction. The effect of drought stress was
more evident in Rajalaxmi and IR64 by a yield reduction of 57.4% and 43.2%
as against only 24.3% in Sahbhagidhan. The combined application of
nutrients resulted in higher proline accumulation, chlorophyll and carbohydrate
concentrations, and photosynthesis and antioxidant enzymes, ultimately
better tolerance to drought. This is reflected in higher values of
tolerance indices and low scores of leaf drying and leaf rolling, especially for
Sahbhagidhan. The combined application of P, K, Ca, Zn, and Fe resulted in
52.9, 53.3, 48.9% higher yield over P or K application. Rice drought tolerance
can be managed by combining breeding of drought-tolerant high yielding
varieties with the proper application of fertilizer nutrients.ICA