Presentation on theme: "Introduction to site-specific nutrient management (SSNM)"— Presentation transcript:
1 Introduction to site-specific nutrient management (SSNM)
2 Need for an improved approach to nutrient management for rice The need of rice for nutrients:Can differ from field to fieldCan differ year-to-year because of varying climate and growing-season conditionsFertilizer rates and timing should be adjusted to location and season-specific needs and conditions
3 SSNM: A plant-based approach SSNM provides an approach for ‘feeding’ rice with nutrients as neededMake optimal use of existing nutrients, such as from soil, residues, and manuresApply N fertilizer at the time and amount required by the rice cropApply P and K fertilizers based on crop need, as determined through the omission plot technique
4 Site-specific nutrient management (SSNM) Feedingcropneeds!1. Establish a yield target – the crop’s total needs3. Fill deficit between total needs and indigenous supply2. Effectively use existing nutrients
5 SSNM: A plant-based approach Feed the plant’s need for additional nutrientsEstablish a yield target (plant’s need for nutrients)Effectively use the indigenous supply of nutrients (soil, water, crop residues, and manures)Apply fertilizer to fill the gap between crop need and indigenous supplyFirmly based on scientific principles of nutrient requirements of the crop to achieve high yields
6 Nutrient management for rice: “Match supply to need” 1. Apply only a moderate amount of fertilizer N within 2 weeks after transplanting or 21 days after sowing2. Use the LCC to distribute N from 2 weeks after transplantingSelect an N dose and critical LCC value to achieve high yield and 18 to 25 kg grain yield increase per kg N appliedAchieve 1 ton yield increase with 40 to 55 kg N/ha3. Apply sufficient P and K to overcome deficiency and replace nutrient removed with crop harvestApply P basalSplit apply K (50% basal and 50% at panicle initiation)
7 Source of nutrients taken up by rice SoilCrop residues and manuresIrrigation waterBiological N2 fixationFertilizers
8 Source of nutrients taken up by rice NitrogenPotassiumNutrient needed foryield targetIrrigation waterBiological N2 fixationCrop residues & manuresSoil
9 Source of nutrients taken up by rice NitrogenPotassiumNutrient needed foryield targetgapIrrigation waterIndigenous nutrient supplyBiological N2 fixationCrop residues & manuresSoil
10 Source of nutrients taken up by rice NitrogenPotassiumNutrient needed foryield targetFertilizerIrrigation waterBiological N2 fixationCrop residues & manuresSoil
11 SSNM aims to increase profit for rice farmers through High yieldHigh efficiency of fertilizer use
12 Implementing SSNMMatch early application of N with low initial demand of rice for N.Dynamically apply N based on leaf color, as a measure of plant need for N.Determine P and K needs based on crop growth to overcome deficiency and replace nutrient removed with crop harvest.Use existing recommendations for micronutrients.Provide principles and guidelines to assist decision making by extension and farmers.
13 Development and evaluation of site-specific nutrient management (SSNM) for rice GBPUATTRRISWMRIIIRRPhilRiceZUMASCLRRINISFPTRRCGAASHAUYUHZAUBRRIHUAFMember from 1994 or 1997Member from 2001Affiliated memberPPI/PPICIFASDCIPI
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