EFFECT OF NUTRIENT OMISSION ON GROWTH AND YIELD OF POTATO (SOLANUM TUBEROSUM L.) UNDER RAINFED ECOSYSTEMS OF NORTH EASTERN HILLY REGION, MEGHALAYA
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Authors
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Janani P
Scientist
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Manoj Kumar
Principal Scientist (Soil Science)
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Jagdev Sharma
Principal Scientist (Soil Science)
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Ngursangzuala Sailo
Senior Scientist (Plant Physiology)
Keywords:
Nutrient response, nutrient omission, potato, varietiesAbstract
A field experiment was conducted to identify the most limiting nutrients for potato (Solanum tuberosum L.) production in Shillong, NEH Region, Meghalaya, India, during 2019-20. The experiment was replicated three times using a factorial randomized complete block design. The study included five nutrient treatments viz., control (-NPK), omission of nitrogen (-N), phosphorus (-P), and potassium (-K), recommended NPK (+NPK) and two potato varieties viz., K. Girdhari and K. Megha. Results showed that the average potato yield for the nutrient omission treatments were -K (12.67 t ha-1), -P (10.81 t ha-1), -N (7.85 t ha-1), and -NPK (3.53 t ha-1). The recommended NPK treatment resulted in the highest production (16.46 t ha-1) with a net return of ``160559 ha-1 and a B:C ratio of 1.95, indicating its superiority in terms of profitability and sustainability. The agronomic efficiency of nitrogen (AEN), phosphorus (AEP) and potassium (AEK) ranged from 52.17~92.32, 35.97~107.71 and 71.94~215.41 kg yield increase per kg of nutrient applied, respectively. Similarly, the partial factor productivity for nitrogen (PFPN), phosphorus (PFPP), and potassium (PFPK) under the fully fertilized treatment was 117.54, 137.14, and 274.27 kg yield per kg of nutrient input, respectively.
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