Page 166 - Plan GI

ผ-4

ตารางผนวก ก-1 (3) ระดับความเหมาะสมของคาพิสัยของคุณภาพที่ดินสำหรับ (หอมแดงศรีสะเกษ)

LAND-USE REQUIREMENT FACTOR RATING
LAND QUALITY Diagnostic factor Unit S1 S2 S3 N
TEMPERATURE (t) Mean temp. in c 15-20 21-23 24-25 >25
growing period 14-12 11-10 <10

MOISTURE AVAILABILITY (m) Ann. rainfall mm.

Water requirement 450-600 350-450 250-350 <250
mm.
in growing period
OXYGEN AVAILABILITY (o) Soil drainage class 5,6 4 3 1,2
NUTRIENT AVAILABILITY (s) N (total) %
P ppm

K ppm
Organic matter %
Nutrient status class VH,H M,L
NUTRIENT RETENTION (n) C.E.C. ดินลาง meq/100g >15 5-15 <5
B.S. ดินลาง % >35 <35
ROOTING CONDITIONS (r) Effective soil depth cm. >50 30-50 15-30 <15
Gravel % <15 15-40 40-80 >80

Root penetration class 1 2 3 4
FLOOD HAZARD (f) Frequency yrs./time 10yrs/1 6-9yrs/1 3-5yrs/1 1-2yrs/1

EXCESS OF SALTS (x) EC. of saturation mmho/cm. <1.5 1.5-3 3-4.5 >4.5
SOIL TOXICITIES (Z) Depth of jarosite cm. >150 100-150 50-100 <50
Reaction pH 6.1-6.5 6.6-7.8 7.9-8.4 >8.4

5.1-6.0 4.5-5.0 <4.5
SOIL WORKABILITY (k) Workability class class 1 2 3 4
POTENTIAL FOR Slope class ABC D E >E
MECHANIZATION (w)
Rockout crop class 1 2,3 4 5
Stoniness class 1 2 3 4
EROSION HAZARD (e) Slope class A BC D > D
Soil loss ton/rai/yrs <2 2-4 4-12 >12
Note :- Day lenght - long day / day neutral
Growing period - 100-125 days (plus 30-35 days in nursey)
Growing period (moisture) – any growth stage particularly during bulb development anf flowering
Soil texture requirement of crips – vfsl,l,sil,si
Others –