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POTASSIUM-CONSTRAINED HIGH YIELDS IN IRRIGATED RICE |
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| Authors: | M A Saleque M K Uddin A K M Ferdous M H Rashid |
| Institution: | 1. Bangladesh Rice Research Institute , Gazipur , Bangladesh;2. Institute of Tropical Agriculture , Universiti Putra Malaysia , Selangor , Malaysia;3. Agricultural Advisory Society, Lalmatia , Dhaka , Bangladesh |
| Abstract: | Nutritional constraints often restrict yields of field crops in farmers’ fields. Determination of cut-off yield would increase the understanding of yield-limiting nutrients. The present study aimed to determine minimum rice yield target of high-yielding subpopulation in farmers’ fields and to identify the most limiting nutrient in farmers’ fields. Popular high yielding rice was grown in 42 farmers’ fields with two treatments – farmers’ nutrient management plan (FP) and improved nutrient management plan (INM). Nutrient composition was determined from Y-leaf after 45– 50 days of transplanting. Yield cutoff value was determined from compositional nutrient diagnosis (CND) generic model. The CND generic model gave 6.90 Mg ha?1 as minimum cutoff yield of the high-yield subpopulation. Potassium (K) was identified as the main yield limiting nutrient for rice in piedmont soils. Rice in farmers’ fields may require higher K fertilizer dose for better yield. |
| Keywords: | cutoff yield nutrient ratio compositional nutrient diagnosis variance ratio function |