Title: Introduction to site-specific nutrient management (SSNM)
1Introduction to site-specific nutrient management
(SSNM)
2Need 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
3SSNM 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
4Site-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
5SSNM 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
6Nutrient 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)
7Source of nutrients taken up by rice
- Soil
- Crop residues and manures
- Irrigation water
- Biological N2 fixation
- Fertilizers
8Source of nutrients taken up by rice
Nitrogen
Potassium
Nutrient needed for yield target
9Source of nutrients taken up by rice
Nitrogen
Potassium
10Source of nutrients taken up by rice
Nitrogen
Potassium
11SSNM aims to increase profit for rice farmers
through
- High yield
- High efficiency of fertilizer use
12Implementing 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.
13Development and evaluation of site-specific
nutrient management (SSNM) for rice