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Introduction to site-specific nutrient management (SSNM)

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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 field Can differ year-to-year because of varying climate and growing-season conditions Fertilizer 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 needed Make optimal use of existing nutrients, such as from soil, residues, and manures Apply N fertilizer at the time and amount required by the rice crop Apply P and K fertilizers based on crop need, as determined through the omission plot technique

4 1. Establish a yield target – the crops total needs 2. Effectively use existing nutrients 3. Fill deficit between total needs and indigenous supply Site-specific nutrient management (SSNM) Feeding crop needs!

5 SSNM: A plant-based approach Establish a yield target (plants 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 supply Feed the plants need for additional nutrients Firmly 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 sowing 2. Use the LCC to distribute N from 2 weeks after transplanting Select an N dose and critical LCC value to achieve high yield and 18 to 25 kg grain yield increase per kg N applied Achieve 1 ton yield increase with 40 to 55 kg N/ha 3. Apply sufficient P and K to overcome deficiency and replace nutrient removed with crop harvest Apply P basal Split apply K (50% basal and 50% at panicle initiation)

7 Source of nutrients taken up by rice Soil Crop residues and manures Irrigation water Biological N 2 fixation Fertilizers

8 Soil Source of nutrients taken up by rice NitrogenPotassium Biological N 2 fixation Irrigation water Crop residues & manures Nutrient needed for yield target

9 Soil Source of nutrients taken up by rice NitrogenPotassium Biological N 2 fixation Irrigation water Crop residues & manures Indigenous nutrient supply gap Nutrient needed for yield target

10 Soil Source of nutrients taken up by rice NitrogenPotassium Fertilizer Biological N 2 fixation Irrigation water Crop residues & manures Nutrient needed for yield target

11 SSNM aims to increase profit for rice farmers through High yield High efficiency of fertilizer use

12 Implementing SSNM Match 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 GBPUAT TRRI SWMRI IIRR PhilRice ZU MAS CLRRI NISF PTRRC GAAS HAU YU HZAU BRRI HUAF Member from 1994 or 1997 Member from 2001 Affiliated member PPI/PPICIFASDCIPI


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