工厂化育苗.ppt

工厂化育苗
Review:
1. facilities and development of gemination canbinate
key point: pre-rangement and control of micro-climate
2. plug & substrate / standard plantlet index
classification/selection/
Something important about seed storation:
1. Humidity/temperature/moisture content
1% moisture content shelf life expact
5 (10) temperature shelf life
5-21(40-70) 8%
2. 100 rule (80 rule)
3. container
silver paper/ iron can
Today’s topics
1. water & irrigation
2. substrate & selection of substrate
1. source
2. environment
3. influnce from humanbeing
NO3-
Fe3+
Cl-
Col-
F-
1. PH (pondus hydrogenii ) value
2. basicity
3. salinity
4. SAR(sodium absorption rate)
evaluation index
PH=7
basicity amount of acid used by titration
salinity concentration of saline ions
SAR
concentration of H+ 10-7
stipulation & formula
1. PH value: -
2. basicity value: 80mg/L
3. EC value: < (mS/cm)
4. SAR
the criterion
improvement of irrigation water
1. excessive PH value
2. excessive basicity
3. excessive EC value (salinaty)
4. excessive SAR value
(1) fertilizer (2) acid (3)source (4) R/O
(5) rainwater collection