Introduction to site-specific nutrient management (SSNM) - PowerPoint PPT Presentation

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Introduction to site-specific nutrient management (SSNM)

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Introduction to site-specific nutrient management (SSNM) Need for an improved approach to nutrient management for rice The need of rice for nutrients: Can differ from ... – PowerPoint PPT presentation

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Title: Introduction to site-specific nutrient management (SSNM)


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
Site-specific nutrient management (SSNM)
1. Establish a yield target the crops total
needs
3. Fill deficit between total needs and
indigenous supply
2. Effectively use existing nutrients
5
SSNM A plant-based approach
Feed the plants need for additional nutrients
  • 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
  • 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
  • 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 N2 fixation
  • Fertilizers

8
Source of nutrients taken up by rice
Nitrogen
Potassium
Nutrient needed for yield target
9
Source of nutrients taken up by rice
Nitrogen
Potassium
10
Source of nutrients taken up by rice
Nitrogen
Potassium
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
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