Root classes and spatial arrangement trials

ROOT CLASSES AND SPATIAL ARRANGEMENT OF GMELINA: ITS

EFFECT ON MAIZE AND IMPACT ON CLIMATE CHANGE

ONOFRE S. CORPUZ, PHDCFCST Arakan, Cotabato

Onofre S. Corpuz, Ph.D

The relationship between root system development of planted tree species and its survival, stability and growth has attracted considerable research interest (Van Eerden and Kinghorn 1978; Somerville 1979; Coutts and Lewis 1983; Deans and Ford I983).

The intelligent application of plant combination requires an understanding of the various species interactions. Vandermeer (1989)

Intercropping of corn crops in Gmelina RGP trials at various spatial arrangements will be explored/investigate in this study

Estimation of Biomass and carbon density of the farming system As input to green house gas inventory in the Country

INTRODUCTION


The study was conducted on May 8 – August 23, 2007 (1st cropping) and September 16 – December 31, 2007 (2nd cropping) in a field trials of RGP of Gmelina planted at different spacing in Matalam Cotabato (Fig. 1)

The climate is warm tropical with mean annual temperature ranging from 28 oC – 40oC

Mean annual rainfall of 2,373.5mm. The soil is silty clay with pH value ranging from 6.2 to 7.2. Six months after outplanting, maize were sown in the furrows at

25cm x 60cm. Basal application of complete fertilizer (14-14-14) and side dressing

of urea (46-0-0) at a rate of 120-28-28 (prevailing farmer’s practice in the area) were employed.

METHODOLOGY


Fig. 1. Map showing the Study SiteOnofre S. Corpuz, Ph.D

RESULTS

Figure 2. Grain Yield of corn on both cropping season as affected by tree spacing

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1

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6

7

Gra

in Y

ield

(to

ns

/ha

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Mono-corn 2m x 2m 2m x 3m 2m x 4m

Tree Sapcing

Crop 1 Crop 2


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Gra

in Y

ield

(to

ns/h

a)

Mono-corn R1 R2 R3

RGP Classes

Crop 1 Crop 2

Figure 3. Grain Yield of corn on both cropping season as affected by RGP class

RESULTS



RGP DBH H NL YD WT500 BIOM LA LAIRGP 1.000 DBH 0.000 1.000

H 0.144 0.127 1.000 NL 0.159 0.133 0.354 1.000 YD -0.344 0.821** 0.106 0.138 1.000

WT500 -0.074 0.668** 0.173 0.171 0.677** 1.000 BIOM -0.454 0.862** 0.138 0.204 0.904** 0.605** 1.000

LA -0.124 0.187 0.072 -0.134 0.249 0.166 0.211 1.000 LAI -0.123 0.181 0.069 -0.129 0.241 0.162 0.205 0.999** 1.000

Table 1. Multiple correlation of the growth and yield of corn as affected by tree spacing and RGP classes.

RESULTS

** Highly significant


TREE SPACING CORN BIOMASS Crop 1 Crop 2Mono-corn crop 7.3000a 7.5867a2m x 2m 4.0233b 4.0367b2m x 3m 4.7800bc 3.8500b2m x 4m 5.3133c 4.5500b

Table 3. Mean corn biomass (tons/ha) in both cropping season as affected by tree spacing.

Means followed by the same letter are not significantly different at 5% level

RESULTS


0

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8C

orn

Bio

mass (

ton

s/h

a)

Mono-corn R1 R2 R3

RGP Class

Crop 1 Crop 2

Figure 4. Corn Biomass in both cropping periods as affected by RGP classes

RESULTS


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0.5

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2.5

30 DAP 60 DAP 90 DAP 105 DAP

Measurement Day

Heig

ht (m

) Control

2m x 2m

2m x 3m

2m x 4m

Crop 1 Crop 2

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0.5

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2.5


Measurement Day

Corn

heig

ht (m

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Mono-corn R1 R2 R3

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1.5

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2.5


Tree Spacing

Corn

Heig

ht (

m)

Mono-corn R1 R2 R3

Measurement Day

Crop 1 Crop 2

RESULTS

Figure 11. Leaf area index as affected by tree spacing

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0.05

0.1

0.15

0.2

0.25

0.3

Leaf

Are

a I

nd

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Mono-corn 2m x 2m 2m x 3m 2m x 4m

Tree Spacing

Crop 1 Crop 2

RESULTS


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0.05

0.1

0.15

0.2

0.25

0.3L

ea

f A

rea

In

de

x

Mono-corn R1 R2 R3

Tree Spacing

Crop 1 Crop 2

R G P C l a s s

Figure 12. Leaf area index of as affected by RGP classes

RESULTS


SOURCES AGB (MG/HA) RB (MG/HA)CARBON DENSITY

(MG/HA)Tree components 4.3 1.3 2.52

Corn Component 5.18 2.33

SOC 2.74

Total 7.59

Table 4: Biomass and carbon density of the farming system

RESULTS


Figure 13. Path correlation analysis

RESULTS


The intercropped maize showed significant difference in all agronomic and morphological characters in the 2nd cropping Mono-corn crop dominated significantly in all traits Tree spacing was significantly related to corn yield and biomassRGP class was insignificantly and negatively correlated with corn yield, biomass, leaf area and leaf area index. The significant relationship of tree spacing with corn yield, and biomass implies that wider tree spacing will mean higher yield in corn and the reversed is true with the negative relationship.The farming system stored C of 7.6Mt/ha at 1 year

CONCLUSION


Intercropping of corn with Gmelina at the early stage (not more than a year) with wider tree spacing is possible

A reducing corn yield would be expected when trying to intercrop corn in an older Gmelina

RECOMMENDATIONS


The End….

Thank You!!!


Root classes and spatial arrangement trials

Technology

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