Page 165 - Plan GI

ผ-3

ตารางผนวก ก-1 (2) ระดับความเหมาะสมของคาพิสัยของคุณภาพที่ดินสำหรับ (กระเทียมศรีสะเกษ)

LAND-USE REQUIREMENT FACTOR RATING
LAND QUALITY Diagnostic factor Unit S1 S2 S3 N
TEMPERATURE (t) Mean temp. in c 18-20 21-24 25-30 >30
growing period 17-15 14-12 <12

MOISTURE AVAILABILITY (m) Ann. rainfall mm.

Water requirement 350-500 250-350 200-250 <200
mm.
in growing period
OXYGEN AVAILABILITY (o) Soil drainage class 4,5,6 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. >100 50-100 25-50 <25
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. <2 2-4 4-8 >8
SOIL TOXICITIES (Z) Depth of jarosite cm. >150 100-150 50-100 <50
Reaction pH 5.6-6.5 6.6-7.3 7.4-8.4 >8.4

5.1-5.5 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 - short day
Growing period - 95-125 days
Growing period (moisture) –Bulb formation
Soil texture requirement of crips – vfsl,l,sil,si
Others –