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Valdés-Rodríguez, Sánchez-Sánchez, Pérez-
Vázquez, Ruíz-Bello
Soil texture effects on development
of non-toxic piñón (Jatropha curcas
L.) seedlings
International Conference on JATROPHA CURCAS 2010
Groningen, The Netherlands
November 1-2, 2010
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Contents
Introduction Jatropha curcas non-toxic
Origens and distribution
Uses in México
Soil requirements What is promoted
Our research Objectives
Hypothesis
Methodology
Results
Conclusions
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Jatropha curcas non-toxic
Disemination (Heller, 1996)
Origins and distribution
Non-toxic
Toxic
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Piñon manso traditional uses
Live fenses
Skin deceases
Traditional dishes
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Soil texture requirements
What is promoted
High potential
Sandy
Sandy-Loam
Low potential
Clay
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Research
Objective
To determine the effects of different soils over
development and growth of root and shoot of
J. curcas non toxic seedlings.
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Research
Hypothesis
Ho: Jatropha curcas seedlings growth is the
same in sandy, sandy-loam, and clay-loam
textures
Ha: Jatropha curcas seedlings growth is
different in sandy, sandy-loam, and clay-loam
textures
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Methodology
Site and conditions
Southeasth México
19° 16' 00" N and 96° 16' 32" W
18 m altitude
Natural conditions
Temperature: 19.8 ºC - 40.2 ºC
Humidity: 63.2%
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Methodology
Biological material:
Non-toxic seeds
Location: 18º 59’52” N, 96º
15’ 31” W, 17 mosl
Physical data
Weight: 742.0 mg ± 24.3 mg
Length: 18.55 mm ± 0.68 mm
Width 10.3 mm ± 0.30 mm
Weight, Distribution: Normal
0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,1 1,20
20
40
60
80
100
120
140
160
180
No
. of o
bs
erv
atio
ns
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Methodology
Experimental design
Treatments Age (days)
Sandy D1 D30
Sandy-Loam
Clay-Loam
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Results
Soil analysis
Table 1. Soil chemical analysis and the method used for each test
Soil type pH Organic matter
(%) Total N (%) P (ppm) Ca
(me/100g)
Mg
(me/100g)
Method Potentiometer Walkley-Black N=O.Mx0.05
Olsen-Kitson
Mellon Diehl et al. Diehl et al.
Sandy 7.81
(slightly alkaline)
Not detected (very low)
Not detected (very low)
2.8 (low) 3.859 7.717
Sandy-loam 7.26
(Neutral)
1.824 (medium)
0.0912 (low)
14.0 (medium) 8.770 14.733
Clay-loam 7.43
(slightly alkaline)
3.397 (high)
0.1698 (high)
34.0 (high) 16.487 25.958
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Results
Root collar diameter and heights
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Results
Morphologycal parameters
Number of true leaves
Sandy Sandy-LoamClay-Loam
Nu
mb
er
0
2
4
6
8
Stem Volume
Sandy Sandy-Loam Clay-Loam
Vo
lum
e (
mm
3)
0
2000
4000
6000
8000
10000
12000
14000
16000
18000Number of branches
Sandy Sandy-LoamClay-Loam
Nu
mb
er
0,0
0,5
1,0
1,5
2,0
2,5
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Results
Dry mass a) Stem dry mass
Sandy Sandy-LoamClay-Loam
Weig
th (
g)
0,0
0,5
1,0
1,5
2,0
2,5
3,0
b) Root dry mass
Sandy Sandy-LoamClay-Loam
Roo
ts w
eig
th (
g)
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
1,6
b) Root dry mass
Sandy Sandy-LoamClay-Loam
Roo
ts w
eig
th (
g)
0,0
0,2
0,4
0,6
0,8
1,0
1,2
1,4
1,6
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Conclusions
Best growth on sandy-loam textures
Lowest growth on sandy textures
Clay-loam → Highest number of branches
Clay-loam Sandy-loam Sandy